SECTION 12M2 - SEAT BELTS

Service Precaution

Diagnostic Information

System Schematic

SRS Diagnostic System Check

Chart A SDM Integrity Check

Chart B “AIR BAG" Warning Lamp Comes

“ON" Steady

Chart C “AIR BAG" Warning Lamp Does Not

Come “ON" Steady

DTC 15 Passenger Deployment Loop

Resistance High

DTC 16 Passenger Deployment loop

Resistance Low

DTC 17 Passenger Deployment Loop Open

DTC 18 Passenger Deployment Loop Short

To Ground

DTC 19 Passenger Deployment Loop Short

To Voltage

DTC 21 Driver Deployment Loop Resistance

High

DTC 22 Driver Deployment Loop Resistance

Low

DTC 24 Driver Deployment Loop Short To

Ground

DTC 25 Driver Deployment Loop Short To

Voltage

DTC 26 Driver Deployment Loop Open

DTC 51 Deployment Event Commanded

DTC 53 Deployment Commanded With

Deployment Loop Fault Or Energy Reserves

Out Of Range

DTC 61 Warning Lamp Circuit Failure

DTC 71 Internal SDM Fault

Service Precaution

WARNING: THIS VEHICLE HAS A SUPPLEMENTAL

RESTRAINT SYSTEM (SRS). REFER TO THE SRS

COMPONENT AND WIRING LOCATION VIEW IN

ORDER TO DETERMINE WHETHER YOU ARE

PERFORMING SERVICE ON OR NEAR THE SRS

COMPONENTS OR THE SRS WIRING. WHEN YOU

ARE PERFORMING SERVICE ON OR NEAR THE

SRS COMPONENTS OR THE SRS WIRING, REFER

TO THE SRS SERVICE INFORMATION. FAILURE TO

FOLLOW WARNINGS COULD RESULT IN POSSIBLE

AIR BAG DEPLOYMENT, PERSONAL INJURY, OR

OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.

CAUTION: Always use the correct fastener in the

proper location. When you replace a fastener, use

ONLY the exact part number for that application.

ISUZU will call out those fasteners that require a

replacement after removal. ISUZU will also call out

the fasteners that require thread lockers or thread

sealant. UNLESS OTHERWISE SPECIFIED, do not

use supplemental coatings (Paints, greases, or

other corrosion inhibitors) on threaded fasteners or

fastener joint interfaces. Generally, such coatings

adversely affect the fastener torque and the joint

clamping f or ce, and may dama ge the fastener . Wh en

you install fasteners, use the correct tightening

sequence and specifications. Following these

instructions can help you avoid damage to parts

and systems.

Diagnostic Information

CAUTION: When fasteners are removed, always

reinstall them at the same location from which they

were removed. if a fastener needs to be replaced,

use the correct part number fastener for that

application. if the correct part number fastener is

not available, a fastener of equal size and strength

(or stronger) may be used. fasteners that are not

reused, and those requiring thread locking

compound will be called out. the correct torque

value must be used when installing fasteners that

require it. if the above conditions are not followed,

parts or system damage could result.

Diagnostic Procedures

WARNING: TO AVOID DEPLOYMENT WHEN

TROUBLESHOOTING THE SRS, DO NOT USE

ELECTRICAL TEST EQUIPMENT SUCH AS A

BATTERY–POWERED OR AC–POWERED

VOLTMETER, OHMMETER, ETC., OR ANY TYPE OF

ELECTRICAL EQUIPMENT OTHER THAN THAT

SPECIFIED IN THIS MANUAL. DO NOT USE A NON

POWERED, PROBE–TYPE TESTER.

INSTRUCTIONS IN THIS MANUAL MUST BE

FOLLOWED CAREFULLY, OTHERWISE PERSONAL

INJURY MAY RESULT.

The diagnostic procedures used in this section are

designed to aid in finding and repairing SRS problems.

Outlined below are the steps to find and repair SRS

problems quickly and effectively. Failure to carefully

follow these procedures may result in extended

diagnostic time, incorrect diagnosis and incorrect parts

replacement.

1.Perform The “SRS Diagnostic System Check".

The “SRS Diagnostic System Check" should always

be the starting point of any SRS diagnostics. The

“SRS Diagnostic System Check" checks for proper

“AIR BAG" warning lamp operation and checks for

SRS trouble codes using both “Flash Code" and

“Scan Tool" Methods.

2.Refer To The Proper Diagnostic Chart As

Directed By The “SRS Diagnostic System

Check".

The “SRS Diagnostic System Check" will lead you

to the correct chart to diagnose any SRS problems.

Bypassing these procedures may result in extended

diagnostic time, incorrect diagnosis and incorrect

parts replacement.

3.Repeat The “SRS Diagnostic System Check"

After Any Repair Or Diagnostic Procedures Have

Been Performed.

Preforming the “SRS Diagnostic System Check"

after all repair or diagnostic procedures will assure

that the repair has been made correctly and that no

other conditions exist.

Diagnostic Codes

The Sensing and Diagnostic Module (SDM) maintains a

history record of all diagnostic codes that have been

detected since the SRS codes were last cleared during

service.

1.Active Codes — Faults that are presently detected

this ignition cycle. Active codes are stored in RAM

(Random Access Memory).

2.History Codes — All faults detected since the last

time the history fault memory was cleared. History

codes are stored in EEPROM. (Electronically

Erasable Programmable Read only Memory)

How To Read Trouble Codes

All codes (Active and history) can be read (or cleared)

by using a scan tool or equivalent.

How To Clear Trouble Codes

Trouble codes can only be cleared by using a Scan

Tool. If a “scan tool" is not available then inform the

owner of the stored codes and suggest that the codes

are cleared upon the next visit to an Isuzu dealership.

Scan Tool Diagnostics

A scan tool can be used to read current and history

codes and to clear all history codes after a repair is

complete. The scan tool must be updated to

communicate with the SRS through a replaceable

cartridge or a manufacturer's update before it can be

used for SRS diagnostics. To use the scan tool,

connect it to the DLC connector and turn the ignition

switch “ON". Then follow the manufacturer's directions

for communication with the SRS. The scan tool reads

serial data from the SDM “Serial Data" output (terminal

24) to the DLC connector (terminal 9).

Basic Knowledge Required

Before using this section of the Service Manual, there is

some basic knowledge which will be required. Without

this knowledge, you will have trouble using the

diagnostic procedures in this section. Use care to

prevent harm or unwanted deployment. Read all

cautions in the service manual and on warning labels

attached to SRS components.

Basic Electrical Circuits

You should understand the basic theory of electricity

including series and parallel circuits, and understand

the voltage drops across series resistors. You should

know the meaning of voltage (volts), current (amps),

and resistance (ohms). You should understand what

happens in a circuit with an open or a shorted wire.

You should be able to read and understand a wiring

diagram.

“Flash Code" Diagnostics

Flash code diagnostics can be used to read active

codes and to determine if history codes are present

but cannot be used to clear codes or read history

codes. Flash c ode di agnos tics is enabled by groundin g

by terminal 4 shorting to terminal 13 of the DLC

connector with the ignition switch “ON". Grounding

terminal 4 of the DLC connector pulls the “Diagnostics

Request" input ( Termi nal 1) of the SDM low and signa ls

the SDM to enter the flash code diagnostic display

mode.

The SDM displays the trouble codes by flashing the

warni ng lamp. Each code t hat is disp layed will consist

of a number of fl ashes which repres ents the tens digi t,

a 1.2 second pause, following by a number of flashes

which repr es ent s t he o nes d igi t o f the code. Each c od e

is displayed one time before moving on to the next

code. After all of the codes have been displayed, the

entire code sequence will continually by repeated until

ground is removed from terminal 4 of the DLC

connector.

Two specia l code s exist when reading i n the flash code

mode (Flash Code 12 and Flash Code 13). “Flash

Code 12“ will always be the first code displayed when

the flash code mode is enable Code 12 is not an

indication of a SRS problem but an indication that the

flash code mode has been enabled. If there are no

active or history codes present, the SDM will display

code 12 until ground is removed from the DLC

connector at terminal 4. “flash Code 13" will be

displayed if history codes are present. To read the

history codes a scan tool must be used.

TECH 2 Tool Data

DISPLY on TECH 2 UNIT VALUE

IGNITION V 12.0

WARNING LAMP ON/OFF ON

DRIV. SENSELO V 2.5

PASS. SENSELO V 2.5

DRIVER RESIST OHMS 3.1

PASS. RESIST OHMS 3.1

DRIV. ENERGY V 22.3

PASS. ENERGY V 22.3

WARN LAMP ON HRS

WARNING LAMP

CYCLES ON

DRV LPS NOT PRES

PASS LPS PRESENCE

SYSTEM TYPE DRIV/PASS

WARNING LAMP ON

LAMP DRIVER FBK ON

DRIVER SEATBE LT BACKUPED

DRIVER SBELT FBK BACKUPED

System Schematic

D09LX00001

SRS Diagnostic System Check

The diagnostic procedures used in this section are

designed to find and repair SRS m alfunctions. To ge t

the best results, it is important to use the diagnostic

charts and follow the sequence listed below:

A Perform the “SRS Diagnostic System Check."

The “SRS Diagnostic System Check" must be the

star ting point of any SRS diagnostics. The “SRS

Diagnostic System Check" checks for proper “AIR

BAG" warning lamp operation, the ability of the

SDM to c ommunicate through the “Seri al Data" line

and whether SRS diagnostic trouble codes exist.

B Refer to the proper diagnostic char t as directed by

the “SRS Diagnostic System Check."

The “SRS Diagnostic System Check" will lead you

to the correct chart to diagnose any SRS

malfunctions. Bypassing these procedures may

result in extended diagnostic time, incorrect

diagnosis and incorrect parts replacement.

C Repeat the “SRS Diagnostic System Check" after

any repair or diagnostic procedures have been

preformed.

Performing the “SRS Diagnostic System Check"

after al l repa ir or dia gnostic pro ce dures wi ll ensur e

that the repai r has been made co rrec tl y and tha t no

other malfunctions exist

Circuit De sc r i p t i o n

When t he i gn iti on switch is fi rst turne d “ O N", “ Ign iti on 1"

voltage is applied from the “SRS 2" fuse to the SDM at

the “Ignition 1" input terminals “12". The SDM

responds by flashing the “AIR BAG" warning lamp

seven times, while performing tests on the SRS.

Notes On Sy stem Che ck Chart:

1. The “AIR BAG" warning lamp should flash seven

times after ignition is first turned “ON".

2. After the “AIR BAG" warning lamp flashes seven

times, it should turn “OFF"

3. This test checks for the proper operation of the

“Serial Data" line. This test will also determine

whether hi stor y diagnosti c trouble codes ar e stored

and, if so, identify them.

4. Improper operation of the “AIR BAG" w arning lamp is

indicated. This test differentiates a warning lamp

stays “ON" condition from a warning lamp does not

come “ON" condition.

5. This test checks for proper operation of the “Serial

Data" line. This test will also identify the stored

diagnostic trouble codes and whether they are

current or history.

Diagnostic Aids:

The order in which diagnostic trouble codes are

diagnosed is very important. Failure to diagnose the

diagnostic trouble codes in the order specified may

result in extended diagnostic time, incorrect diagnosis

and incorrect parts replacement.

SRS Diagnostic System Check

Step Action Yes No

1 Note the “Air Bag" warning lamp as ignition switch is turned “ON."

Does the “AIR BAG" warning lamp flash seven (7) times? Go to Step 2 Go to Step 3

2 Note the “AIR BAG" warning lamp after it flashed 7 times.

Does the “AIR BAG" warning lamp go “OFF"? Go to Step 4 Go to Step 5

3 Note the “AIR BAG" warning lamp as ignition switch is turned

“ON".

Does the “AIR BAG" warning lamp come “ON" steady? Go to Chart B. Go to Chart C.

4 1. Note the “AIR BAG" warning lamp as that ignition switch is

tur n ed “ON."

Ignition switch “OFF."

2. Connect a scan tool to data link connector.

3. Follow direction given in the scan tool instruction manual.

Ignition switch “ON."

4. Request th e SRS dia gnostic tro uble cod e display, rec ode all

history diagnostic trouble code(s). specify as such, on repair

order

Is (are) diagnostic trouble code(s) displayed?

Ignition switch

“OFF."

When DTC 71 is

set, go to DTC 71

Chart.

For all other history

codes refer to

“Diagnostic Aids"

For that specific

DTC.

A history DTC

indicates the

malfunction has

been repaired or is

intermittent.

SRS is functional

and free of

malfuncitons, no

further diagnosis is

required.

If scan tool

indicated “NO

DA T A RECEIVED,"

refer to chassis

electrical section8.

5 1. Ignition switch “OFF."

2. Connect a scan tool to data link connector.

3. Follow directions as given in the scan tool instruction manual.

4. Ignition switch “ON."

5. Request the SRS diagnostic trouble code display, Recode all

diagnostic trouble code(s), specifying as current or history

on repair order.

Is (are) diagnostic trouble code (s) displayed?

Ignition switch

“OFF".

When DTC 53 is

set, go to DTC 53

chart.

When DTC 51 is

set, go to DTC 51

chart.

When DTC 19 is

set, go to DTC 19

chart.

When DTC 25 is

set, go to DTC 25

chart.

Diagnose

remaining current

DTCs from lowest

to highest.

When only his tory

DTCs e xist, refer to

“Diagnostics Aids"

for that specific

DTC.

A history DTC

indicates the

malfunction has

been repaired or is

intermittent.

If scan tool

indicates “No

Data Received,"

refer to chassis

electrical

section8.

Chart A SDM Integrity Check

D09LX00001

Circuit Description:

When the SDM recognizes “Ignition 1" voltage, applied

to terminals “12", is greater than 9 volts, the “AIR BAG"

warni ng lamp is flash ed 7 times to verify operation . At

this time the SDM performs “Turn–ON" tests followed

by “Conti nuous Monitor ing" tests. When a ma lfunctio n

is detected, the SDM sets a current diagnostic trouble

code and illuminates the “AIR BAG" warning lamp. The

SDM will clear current diagnostic trouble codes and

move them to a history file when the malfunction is no

longer detected and/or the ignition switch is cycled,

except for DTCs 19, 25, 51, 53 and 71. DTC 71 can

only be cleared using a scan tool “Clear Codes"

command. If DTCs 51, 53 are not indicated then DTC

71 is not existing. DTCs 51, 53 and 71 can not be

cleared after a “Clear Codes" command is issued.

Chart Test Descr iption:

Number(s) below refer to step number(s) on the

diagno sti c ch art:

1. This test confirms a current malfunction. If no

current malfunction is occurring (history DTC set)

the “Diagno stic Aid s" for the appropr iate dia gnostic

tr oub le code sh oul d be referenc ed. The SDM sh oul d

not be replaced for a history diagnostic trouble

code.

2. This test checks for a malfunction introduced into the

SRS during the diagnostic process. It is extremely

unlikely that a malfunctioning SDM would cause a

new malfunction to occur during the diagnostic

process.

3. When all circuitry outside the SDM has been f ound to

operate properly, as indicated by the appropriate

diagnostic chart, then and only then should the SDM

be replaced.

Chart A SDM Integrity Check

WARNING: DURING SERVICE PROCEDURES. BE VERY CAREFUL WHEN HANDLING A SENSING AND

DIAGNOSTIC MODULE (SDM). NEVER STRIKE OR JAR THE SDM. NEVER POWER UP THE SRS WHEN THE

SDM IS NOT RIGIDLY ATTACHED TO THE VEHICLE. ALL SDM AND MOUNTING BRACKET FASTENERS

MUST BE CAREFULLY TORQUED AND THE ARROW MUST BE POINTING TOWARD THE FRONT OF THE

VEHICLE TO ENSURE PROPER OPERATION OF THE SRS. THE SDM COULD BE ACTIVATED WHEN

POWERED WHILE NOT RIGIDLY ATTACHED TO THE VEHICLE WHICH COULD CAUSE DEPLOYMENT AND

RESULT IN PERSONAL INJURY.

Step Action Yes No

1 1. This chart assumes that the “SRS Diagnostic System

Check" and either a symptom chart or a diagnostic trouble

code chart diagnosis have been performed. When all

circuitry outside the SDM has been found to operate

properly, as indicated by the appropriate diagnostic chart,

and the symptom or DTC remains current, the following

2. Diagnosti c proce dures must be performed to verify the ne ed

for SDM replacement.

3. Ignition switch “OFF".

4. Reconnec t all SRS co mponen ts, ensure all comp onents are

properly mounted.

5. Ensure the ignition switch has been “OFF" for at least 15

seconds.

6. Note “AIR BAG" warning lamp as ignition switch is turned

“ON."

Does warning lamp flash 7 times then go “OFF"?

The symptom or

DTC is no longer

occurring.

Clear SRS

diagnostic trouble

codes.

Repeat “SRS

Diagnostic System

Check" Go to Step 2

2 Using a scan tool request diagnostic trouble code display.

Is the same symptom or DTC occurring as was when the “SRS

Diagnostic System Check " was first perf ormed?

Go to Step 3

Ignition switch

“OFF".

Go to the

appropriate chart

for the indicated

malfunction.

3 1. Clear “SRS Diagnostic Trouble Codes".

2. Ignition switch “OFF" for at least two minutes.

3. Note “AIR BAG" warning lamp as ignition switch is turned

“ON."

Does warning lamp flash 7 times then go “OFF"?

SRS is functional

and free of

malfunctions.

No further

diagnosis is

required.

Go to Step 4

Ignition switch

“OFF."

Replace SDM.

Go to Step 4

4 Reconnect all SRS components, ensure all components are

proper l y mou nted .

Was this step finished?

Repeat the “SRS

Diagnostic System

Check" Go to Step 4

Chart B “AIR BAG" Warning Lamp Comes “ON" Steady

D09LX00001

Circuit Description:

When the ignition switch is first turned “ON", voltage is

applied from the “METER" fuse to “AIR BAG", warnin g

lamp which is connected to “SRS Warning Lamp",

terminal “7". The “SRS 2" fuses apply system voltage

to the “Ignition 1" inputs, terminals “12". The SDM

responds by flashing the “AIR BAG" warning lamp 7

times. If “Ignit ion 1" i s less t han 9 volts, the “AIR BAG"

warning lamp will come “ON" solid with no DTCs set.

Chart Test Descr iption:

Number(s) below refer to step number(s) on the

diagno sti c ch art.

2. This t est checks for an open in the “Igniti on 1" c irc uit

to the SDM.

3. This test checks for the voltage of “IGNITION 1".

4. This test determines whether the malfunction is a

short to ground in circuit IB14–GRN.

Chart B “AIR BAG" warning lamp comes “ON" Steady

Step Action Yes No

1 1. When measurements are requested in this chart use 5–

8840–0285–0 DVM with correct terminal adapter from 5–

8840–0385 –0.

2. Ignition switch “OFF."

3. Connect scan tool to data link connector, follow directions as

given in the scan tool instruction MANUAL.

4. Ignition switch “ON."

5. Request SRS diagnostic trouble code displa y.

Dose scan tool indicate “No Data Received"? Go to Step 2 Go to Step 3

2 1. Ignition switch “OFF".

2. Inspect SDM harness connector connection to SDM.

Is it securely connected to the SDM? Ignition switch

“OFF."

Replace SDM .

Go to Step 5

Connect SDM

securely to de–

activate shorting

clip in SDM

harness connector.

Go to Step 5

3 Using scan tool, request SRS data list.

Is “ignition" more than 9 volts?

Go to Step 4

Ignition switch

“OFF."

Replace SDM.

Go to Step 5

4 1. Ignition switch “OFF."

2. Disconnect SRS coil and passenger air bag assemblies.

yellow 2–pin connector located at base of steering column

and behind the glove box assembly.

Disconnect SDM.

3. Disconnect the connector of “SRS Warning Lamp" of

instrument cluster.

4. Measure resistance from SDM harness connector terminal

“6" to ground.

Does 5–8840–0285–0 display “OL" (Infinite)? Go to Chart A

Replace SRS

harness.

Go to Step 5

5 Reconnect all SRS components, ensure all components are

proper l y mou nted .

Was this step finished?

Repeat the “SRS

Diagnostic System

Check" Go to Step 5

Chart C “AIR BAG" Warning Lamp Does Not Come “ON" Steady

D09LX00001

Circuit Description:

When the ignition switch is first turned “ON", voltage is

applied from the “METER" fuse to the “AIR BAG"

warning lamp which is connected to “SRS Warning

Lamp", terminal “7". The “SRS 2" fuse apply system

voltage to the “Ignition 1" inputs, terminals “12". The

SDM re sp on d s by flas hi ng t h e “A IR B AG" wa rning la mp

seven times. If “Ignition 1" is more than 16 volts, the

“AIR BAG" warning lamp will be still “OFF" solid with no

DTCs set.

Chart Test description:

Number(s) below refer to step number(s) on the

diagno sti c ch art:

1. This test decides whether power is available to SDM

warning lamp power feed circuit.

2. This test deter mines whether the voltage is present

in the warning lamp circuit.

3. This test determines if the malfunction is in the

instrument cluster.

4. This test checks for open in the warning lamp circuit.

5. This test isolates the IB14–GRN circuit and checks

for a short in the IB14–GRN circuit to B+.

8. This test checks for a short from the SDM warning

lamp power feed circuit to ground.

9. This test determines whether the short to ground is

due to a short in the wiring.

Chart C “AIR BAG" Warning Lamp Does Not Come “ON" Steady

Step Action Yes No

1 1. When measurements are requested in this chart, use 5–

8840–0285–0 DVM with correct terminal adapter from 5–

8840–0385 –0.

2. Ignition switch “OFF."

3. Remove and inspect “METER" fuse to the “AIR BAG"

warni ng lam p.

Is fuse good? Go to Step 2 Go to Step 7

2 1. Ignition switch “OFF."

2. Disconnect SRS coil and passenger air bag assemblies.

Yellow 2–pin connector located at base of steering column

and behind the glove box assembly.

3. Disconnect SDM.

4. Ignition switch “ON."

5. Measure voltage on SDM harness connector from terminal

“7" to terminal “6" (ground).

Is system voltage present on terminal “7"? Go to Step 4 Go to Step 3

3 1. Ignition switch “OFF."

2. Remove instrument meter cluster.

3. Check for proper connection to instrument cluster at IB14–

GRN terminal.

4. If ok, then remove and inspect “AIR BAG" bulb.

Is bulb good? Go to Step 5 Replac e bulb.

Go to Step 6

4 1. Ignition switch “OFF."

2. Disconnect instrument meter cluster harness connector.

3. Ignition switch “ON."

4. Measure voltage on SDM harness connector from terminal

“7" to terminal “6" (GROUND).

Is voltage 1 volt or less? Go to Chart A

Replace SRS

harness.

Go to Step 6

5 1. Install bulb.

2. Measure resistance from instrument meter cluster harness

connector IB14–GRN terminal to SDM harness connector

ter m inal “7".

Is resistance 5.0 ohms or less?

Service instrument

mete r clus ter.

Install ins tr ument

mete r clus ter.

Go to Step 6

Replace SRS

harness.

Go to Step 6

6 Reconnect all SRS components, ensure all components are

proper l y mou nted .

Was this step finished?

Repeat the “SRS

Diagnostic System

Check" Go to Step 6

7 Perform chart C.

Was this step finished? Go to Step 8 Go to Step 1

8 1. Replace “METER" fuse.

2. Ignition switch “ON" wait 10 Seconds then ignition switch

“Off. "

3. Remove and inspect “METER" fuse.

Is fuse good?

Install “METER"

fuse.

Go to Step 10 Go to Step 9

9 1. Disconnect SRS coil and passenger air bag assemblies.

Yellow 2–pin conn ectors located at base of steer ing column

and behind the glove box assembly.

2. Disconnect SDM.

3. Replace “SRS 2" fuse.

4. Ignition switch “ON" wait 10 seconds.

5. Ignition switch “OFF".

6. Remove and inspection “SRS 2" fuse.

Is fuse good?

Install “SRS 2"

fuse.

Go to Chart A

Replace SRS

harness.

Replace “SRS 2"

fuse.

Go to Step 10

10 Reconnect all SRS components, ensure all components are

proper l y mou nted .

Was this step finished?

Repeat the “SRS

Diagnostic System

Check" Go to Step 10

Step Action Yes No

DTC 15 Passenger Deployment Loop Resistance High

D09LX00001

Circuit Description:

When the ignition switch is turned “ON", the SDM will

perform tests to diagnose critical malfunctions within

itself. Upon passing these tests “Ignition 1", and

deployment loop voltages are measured to ensure they

are within their res pective nor mal voltage ranges. The

SDM then proc eeds with the “Re sistance Measu rement

Test". “Passenger B ag Low" ter minal “1 6" is grounded

through a resister and the passenger current source

connected to “Passenger Bag High" terminal “15"

allows a known amount of current to flow. By

monitoring the voltage difference between “Passenger

Bag High" and “Passenger Bag Low" the SDM

calculates the combined resistance of the passenger

air bag assembly, harness wiring circuits IB07–YEL/

RED and IB08–YEL/GRN connector terminal contact.

DTC Will Set When:

The combined resistance of the passenger air bag

assembly, harness wiring circuits IB07–YEL/RED and

IB08–YEL/GRN, and connector terminal contact is

above a specified value. This test is run once each

ignition cycle during the “Resistance Measurement

Test" when:

1. No “higher priority faults" are detected during “Turn–

ON",

2. “Ignition 1" voltage is in the specified value.

Action Taken:

SDM turns “ON" the “AIR BAG" war ning lamp and sets

a diagnostic trouble code.

DTC Will Clear When:

The ignition switch is turned “OFF."

DTC Chart Test Desc ription:

Number(s) below refer to step number(s) on the

diagno sti c ch art:

2. This test determines whether the malfunction is in the

SDM.

3. This test verifies proper connection of the yellow 2–

pin connector.

4. This test checks for proper contact and/or corrosion

of the yellow 2–pin connector terminals.

5. The test checks for a malfunctioning passenger air

bag assembly.

6. This test determines whether the malfunction is due

to high resistance in the wiring.

Diagnostic Aids:

An intermittent co ndition is likely to be caused by a poor

connection at the passenger air bag assembly harness

connector terminals “1" and “2", SDM terminal “15" and

“16", or a poor wire to terminal connection in circuits

IB07–YEL /RED and IB08–YEL/GRN. This test for this

diagnosti c trouble code is only run while the “ AIR BAG"

warning lamp is performing the bulb check, unless

DTC 17 or DTC 26 is detected. When a scan tool

“Clear Codes" c ommand i s issued and the malfunction

is st ill prese nt, the DTC wil l not reappear until the next

ignition cycle.

DTC 15 Passenger Deployment loop Resistance High

Step Action Yes No

1 Was the “SRS Diagnostic System Check" Performed?

Go to Step 2

Go to The “SRS

Diagnostic System

Check"

2 1. When measurements are requested in this chart use 5–

8840–0285–0 DVM with correct terminal adapter from 5–

8840–0385 –0.

2. Use scan tool data list function, read and record the

passenger deployment loop resistance.

Is passenger resist. more than 2.9 ohms? Go to Step 3 Go to Chart A

3 1. Ignition switch “Off."

2. Make sure the passenger air bag assembly yellow 2–pin

connector located behind the glove box assembly is seated

properly.

Is the yellow 2–pin connector connected properly? Go to Step 4

Seat passenger Air

Bag asse mbly

yellow 2–pin

connector properly.

Go to Step 7

4 1. Disconnect and inspect the passenger air bag assembly

yellow 2–pin connector located behind the glove box

assembly.

2. If ok, reconnect the passenger air bag assembly 2–pin

connector.

3. Ignition switch “ON."

Is DTC 15 current? Go to Step 5 Go to Step 7

5 1. Ignition switch “Off."

2. Disconnect SRS coil and passenger air bag assembly, yello w

2–pin connector located at the base of the steering column

and behind the glove box assembly.

3. Connect 5–8840–2421–0 SRS driver / passenger load tool

and appro priate ad apte rs to S RS c oi l and passe nger air bag

assembly harness connectors.

4. Ignition switch “ON."

Is DTC 15 Current? Go to Step 6

Ignition switch

“Off."

Replace the

passenge r air b ag

assembly.

Go to Step 7

6 1. Ignition switch “Off."

2. There has been an incr ease in the total circuit res istance of

the passenger inflator deployment loop.

3. Use the high resolution ohmmeter mode of the DVM while

checking circuits IB07–YEL/RED and IB08–YEL/GRN, and

SDM connector terminal “15" and “16" to locate the root

cause.

Was a fault found?

Replace SRS

harness.

Go to Step 7 Go to Chart A

7 1. Reconnect all components ensure all component are

properly mounted.

2. Clear diagnostic trouble codes.

Was This step finished?

Repeat the “SRS

Diagnostic System

Check" Go to Step 7

DTC 16 Passenger Deployment loop Resistance Low

D09LX00001

Circuit Description:

When the ignition switch is turned “ON", the SDM will

perform tests to diagnose critical malfunctions within

itself. Upon passing these tests “Ignition 1", and

deployment loop voltages are measured to ensure they

are within their res pective nor mal voltage ranges. The

SDM then proc eeds with the “Re sistance Measu rement

Test". “Passenger B ag Low" ter minal “1 6" is grounded

through a resistor and the passenger current source

connected to “P assenger Bag High" terminal “15" allows

a known amount of current to flow. By monitoring the

voltage difference between “Passenger Bag High" and

“Passenger Bag Low", the SDM calculates the

combined resistance of the passenger air bag

assembly, harness wiring circuits IB07–YEL/RED and

IB08–YEL/GRN connector terminal contact.

DTC Will Set When:

The combined resistance of the passenger air bag

assembly, harness wiring circuits IB07–YEL/RED and

IB08–YEL/GRN, and connector terminal contact is

above a specified value. This test is run once each

ignition cycle during the “Resistance Measurement

Test" when:

1. No “higher priority faults" are detected during “Turn–

ON",

2. “Ignition 1" voltage is in the specified value.

Action Taken:

SDM turns “ON" the “AIR BAG" war ning lamp and sets

a diagnostic trouble code.

DTC Will Clear When:

The ignition switch is turned “OFF."

DTC Chart Test Desc ription:

Number(s) below refer to step number(s) on the

diagno sti c ch art:

2. This test determines whether the malfunction is in the

SDM.

3. This test verifies connection of the yellow 2–pin

connector.

4. This test cheeks for proper operation of the shor ting

clip in the yellow 2–pin connector.

5. The test checks for a malfunction passenger air bag

assembly.

6. This test determines whether the malfunctioning is

due to shortening in the wiring.

Diagnostic Aids:

An intermittent condition is likely to be caused by a short

between circuits IB07–YEL/RED and IB08–YEL/GRN,

or a malfunctioning shorting clip on the passenger air

bag assembly which would require replacement of the

air bag assembly. The test for this diagnostic trouble

code is only run while “AIR BAG" warning lamp is

perfor ming the bulb check, unle ss DTC 17 or DTC 26 is

detected. When a scan tool “Clear Codes" command is

issued and the malfunction is still present, the DTC will

not reappear until the next ignition cycle.

DTC 16 Passenger Deployment loop Resistance Low

Step Action Yes No

1 Was the “SRS Diagnostic System Check" performed?

Go to Step 2

Repeat the “SRS

Diagnostic System

Check"

2 1. When measurements are requested in this chart use 5–

8840–0285–0 DVM with correct terminal adapter from 5–

8840–0385 –0.

2. Using scan tool data list function, read and record the

passenger deployment loop resistance.

Is passenger resist. less than 1.4 ohms? Go to Step 3 Go to Chart A

3 1. Ignition switch “Off."

2. Make sure the passenger air bag assembly yellow 2–pin

connector located behind the glove box assembly is seated

properly.

Is the yellow 2–pin connector connected properly? Go to Step 4

Seat passenger air

bag assembly

yellow 2–pin

connector properly.

Go to Step 7

4 1. Disconnect and inspect the passenger air bag assembly

yellow 2–pin connector located behind the glove box

assembly.

2. If ok, reconnect the passenger air bag assembly 2–pin

connector.

3. Ignition switch “ON."

Is DTC 16 Current? Go to Step 5 Go to Step 7

5 1. Ignition switch “Off."

2. Disconnect SRS coil and passenger air bag assembly, yello w

2–pin connector located at the base of the steering column

and behind the glove box assembly.

3. Connect 5–8840–2421–0 SRS driver/passenger load tool

and appro priate ad apte rs to SR S c oil and pas se nger ai r bag

assembly harness connectors.

4. Ignition switch “ON."

Is DTC 16 current? Go to Step 6

Ignition switch

“Off."

Replace the

passenge r air b ag

assembly.

Go to Step 7

6 1. Ignition switch “Off."

2. There has been a decrease in the total circuit resistance of

the passenger inflator deployment loop.

3. Use the high resolution ohmmeter mode of the DVM while

checking circuits IB07–YEL/RED and IB08–YEL/GRN, and

SDM connector terminal “15" and “16" to locate the root

cause.

Was a fault found?

Replace SRS

harness.

Go to Step 7 Go to Chart A

7 1. Reconnect all components, ensure all component are

properly mounted.

2. Clear diagnostic trouble codes.

Was this step finished?

Repeat the “SRS

Diagnostic System

Check" Go to Step 7

DTC 17 Passenger Deployment Loop Open

D09LX00001

Circuit Description:

When the ignition switch is turned “ON", the SDM will

perform tests to diagnose critical malfunctions within

itself. Upon passing these tests, “Ignition 1", and

deployment loop voltages are measured to ensure they

are within their respective normal voltage ranges.

During “Continuous Monitoring" diagnostics, a fixed

amount of current is flowing in the deployment loop.

This produces proportional voltage drops in the loop.

By monitoring the voltage difference between

“Passenger Bag High" and “Passenger Bag Low", the

SDM calculates the combined resistance of the

passenger air bag assembly, harness wiring circuits

IB07–YEL/RED AND IB08–YEL/GRN, and connector

terminal contact.

DTC Will Set When:

The voltage difference between “Passenger Bag High"

terminal “15" and “Passenger Bag Low" terminal “16" is

above or equal to a specified value for 500 milliseconds

during “Continuous Monitoring".

Action Taken:

SDM tur ns “ON" the “AIR B AG" war ning lamp and sets

a diagnostic trouble code.

DTC Will Clear When:

The voltage difference between “Passenger Bag High"

terminal “15" and “Passenger Bag Low" terminal “16" is

below a specified value for 500 milliseconds during

“Continuous Monitoring".

DTC Chart Test Desc ription:

Number(s) below refer to step number(s) on the

diagno sti c ch art:

2. This test determines whether the malfunction is in the

SDM.

3. This test verifies proper connection of the yellow 2–

pin connector.

4. This test cheeks for proper contact and/or corrosion

of the shorting clip in the yellow 2–pin connector

terminals.

5. The test checks for a malfunctioning passenger air

bag assembly.

6. This test determines whether the open in the wiring.

Diagnostic Aids:

An intermittent co ndition is likely to be caused by a poor

connec tion at the passeng er air bag assem bly har ness

connector terminals“1" and “2", SDM terminals “15"

and “16", or an open in circuits IB07–YEL/RED and

IB08–YEL/GRN.

DTC 17 Passenger Deployment Loop Open

Step Action Yes No

1 Was the “SRS Diagnostic System Check" performed?

Go to Step 2

Go to the “SRS

Diagnostic System

Check"

2 1. When measurements are requested in this chart use 5–

8840–0285–0 DVM with correct terminal adapter from 5–

8840–0385–0.

2. Using scan tool data list function, read and record the

passenger differential voltage.

Is passenger VDIF 0.4 volts or more? Go to Step 3 Go to Chart A

3 1. Ignition switch “OFF".

2. Make sure the passenger air bag assembly yellow 2–pin

connector located behind the glove box assembly is seated

properly.

Is the yellow 2–pin connector connected properly? Go to Step 4

Seat passenger air

bag assembly

yellow 2–pin

connector properly.

Go to Step 7

4 1. Disconnect and inspect the passenger air bag assembly

yellow 2–pin connector located behind the glove box

assembly.

2. If ok, reconnect the passenger air bag assembly 2–pin

connector.

3. Ignition switch “ON".

Is DTC 17 current? Go to Step 5 Go to Step 7

5 1. Ignition switch “Off."

2. Disconnect SRS coil and passenger air bag assembly, yello w

2–pin connector located at the base of the steering column

and behind the glove box assembly.

3. Connect 5–8840–2421–0 SRS driver / passenger load tool

and appro priate ad apte rs to SR S c oil and pas se nger ai r bag

assembly harness connectors.

4. Ignition switch “ON."

Is DTC 17 current? Go to Step 6

Ignition switch

“Off."

Replace the

passenge r air b ag

assembly.

Go to Step 7

6 1. Ignition switch “Off."

2. There has be en an open circuit resis tance in the passe nger

deployment loop.

3. Use the high resolution ohmmeter mode of the DVM while

checking circuits IB07–YEL/RED and IB08–YEL/GRN, and

SDM connector terminal “15" and “16" to locate the root

cause.

Was a fault found?

Replace SRS

harness.

Go to Step 7 Go to Chart A

7 1. Reconnect all components ensure all component are

properly mounted.

2. Clear diagnostic trouble codes.

Was this step finished?

Go to the “SRS

Diagnostic System

Check" Go to Step 7

DTC 18 Passenger Deployment Loop Short To Ground

D09LX00001

Circuit Description:

When the ignition switch is turned “ON", the SDM will

perform tests to diagnose critical malfunctions within

itself. Upon passing these tests, “Ignition 1", and

deployment loop voltages are measured to ens ure they

are within their respective normal voltage ranges.

The SDM monitors the voltages at “Driver Bag Low"

ter m ina l “4" and “ Passenger B ag Low" term in al “ 16" t o

detect short to ground in the air bag assembly circuits.

DTC Will Set When:

Neither of the two air bag assemblies is open.

“Ignitio n 1" is with in the normal op erating voltage range.

Once these conditions are met and the voltage at

“Passenger Bag Low" is below a specified value, DTC

18 will set. This test is run once each ignition cycle and

“Continuous Monitoring".

Action Taken:

SDM tur ns “ON" the “AIR B AG" war ning lamp and sets

a diagnostic trouble code.

DTC Will Clear When:

This malfu nction is no longer occurr ing and the ig nition

switch is turned “OFF".

DTC Chart Test Desc ription:

Number(s) below refer to circled number(s) on the

diagno sti c ch art.

2. This test determines whether the SDM is

malfunctioning.

3. This test isolates the malfunction to one side of the

passenger air bag assembly y ellow 2–pin connector

behind glove box compartment.

4. This test determines whether the malfunction is in

circuit IB07–YEL/RED.

5. This test determines whether the malfunction is in

CKT IB08–YEL/GRN.

Diagnostic Aids:

An intermittent condition is likely to be caused by a short

to ground in the passenger air bag assembly circuit.

Inspect circuits IB07–YEL/RED and IB08–YEL/GRN

carefully for cutting or chafing. If the wiring pigtail of the

passenger air bag assembly is damaged, the

component must be replaced.

DTC 18 Passenger Deployment Loop Short To Ground

Step Action Yes No

1 Was the “SRS Diagnostic System Check" performed?

Go to Step 2

Go to the “SRS

Diagnostic System

Check"

2 1. When measurements are requested in this chart use 5–

8840–0285–0 DVM with correct terminal adapter from 5–

8840–0385–0.

2. Ignition switch “OFF."

3. Connect scan tool data link connector. follow directions as

given in the scan tool operator's MANUAL.

4. Ignition switch “ON."

5. Read passenger sense LO.

Is passenger sense LO less than 1.5 volts? Go to Step 3 Go to Chart A

3 1. Ignition switch “OFF."

2. Disconnect passenger air bag assembly yellow 2–pin

connector behind the glove box assembly.

3. Leave driver air bag assembly connected.

4. Connect SRS driver / passenger load tool 5–8840–2421–0

and appropriate adapter to passenger air bag assembly

harness connector.

5. Ignition switch “ON."

Is DTC 18 current? Go to Step 4

Ignition switch

“OFF."

Replace

passenge r air bag

assembly .

Go to Step 6

4 1. Ignition switch “OFF".

2. Disconnect SRS driver / passenger load tool

3. Measure resistance on SDM harness connector from

terminal “15" to terminal “16" (ground).

Does 5–8840–0285–0 display “OL" (Infinite)? Go to Step 5

Replace SRS

Harness.

Go to Step 6

5 Measure resistance on SDM harness connector from terminal

“16" to terminal “6" (ground).

Does 5–8840–0285–0 display “OL" (Infinite)? Go to Chart A

Replace SRS

Harness.

Go to Step 6

6 1. Reconnect all components and ensure all component are

properly mounted.

2. Clear diagnostic trouble codes.

Was this step finished?

Go to the “SRS

Diagnostic system

Check" Go to Step 6

DTC 19 Passenger Deployment Loop Short To Voltage

D09LX00001

Circuit Description:

When the ignition switch is turned “ON", the SDM will

perform tests to diagnose critical malfunctions within

itself. Upon passing these tests, “Ignition 1", and

deployment loop voltages are measured to ens ure they

are within their respective normal voltage ranges.

The SDM monitors the voltages at “Driver Bag Low"

ter m ina l “4" and “ Passenger B ag Low" term in al “ 16" t o

detect short to B+ in the air bag assembly circuits.

DTC Will Set When:

“Ignitio n 1" is with in the normal op erating voltage range.

Once these conditions are met and the voltage at

“Passenger Bag Low" is above a specified value, DTC

19 will set. This test is run once each ignition cycle and

“Continuous Monitoring".

Action Taken:

SDM tur ns “ON" the “AIR B AG" war ning lamp and sets

DTC 19 and also DTC 71.

DTC Will Clear When:

The SDM is replaced.

DTC Chart Test Desc ription:

Number(s) below refer to step number(s) on the

diagno sti c ch art:

2. This test determines whether the malfunction is in the

SDM.

3. This test isolates the malfunction to one side of the

passenger air bag assembly y ellow 2–pin connector

behind glove box assembly.

4. This test determines whether the malfunction is in

circuit IB07–YEL/RED.

5. This test determines whether the malfunction is in

circuit IB08–YEL/GRN.

Diagnostic Aids:

An intermittent condition is likely to be caused by a short

to B+ in the passenger air bag assembly circuit.

Inspect circuits IB07–YEL/RED and IB08–YEL/GRN

carefully for cutting or chafing. If the wiring pigtail of

the passenger air bag assembly is damaged, the

component must be replaced. A careful inspecti on of

circuits IB07–YEL/RED and IB08–YEL/GRN, including

the passenger air bag assembly pigtail is essential to

ensure that the replacement SDM will not be

damaged.

DTC 19 Passenger Deployment Loop Short To Voltage

CAUTION: When DTC 19 has been set, it is necessary to replace the SDM. Setting DTC 19 will also cause

DTC 71 to set. When a scan tool “CLEAR CODES" command is issued and the malfunction is no longer

present, DTC 71 will remain curre nt. Ensure that the shor t to voltage condition is repaired prior to installing

a replacement SDM to avoid damaging the SDM.

Step Action Yes No

1 Perform the “SRS Diagnostic System Check"

Was the “SRS Diagnostic System Check" performed? Go to Step 2

Repeat the “SRS

Diagnostic System

Check"

2 1. When measurements are requested in this chart use 5–

8840–0285–0 DVM With correct terminal adapter from 5–

8840–0385–0.

2. Ignition switch “OFF."

3. Connect scan tool data link connector. follow directions as

given in the scan tool operator's manual.

4. Ignition switch “ON."

5. Read passenger sense LO.

Is passenger sense LO more than 3.5 volts? Go to Step 3 Go to Chart A

3 1. Ignition switch “OFF".

2. Disconnect passenger air bag assembly yellow 2–pin

connector behind the glove box assembly.

3. Leave driver air bag assembly connected.

4. Connect SRS driver / passenger load tool 5–8840–2421–0

and appropriate adapter to passenger air bag assembly

harness connector.

5. Ignition switch “ON."

Is passenger sense LO more than 3.5 volts? Go to Step 4

Ignition switch

“OFF."

Replace

passenge r air bag

assembly.

Go to Step 6

4 1. Ignition switch “OFF."

2. Disconnect SDM.

3. Disconnect SRS driver / passenger load tool.

4. Measure resistance on SDM harness connector from

terminal “15" to terminal “12" (ignition).

Does 5–8840–0285–0 display “OL" (infinite)? Go to Step 5

Replace SRS

harness.

Go to Step 6.

5 Measure resistance on SDM harness connector from terminal

“16" and terminal “12" (ignition).

Does 5–8840–0285–0 display “OL" (infinite)? Go to Chart A

replace SRS

harness.

Go to Step 6

6 1. Reconnect all components ensure all component are

properly mounted.

2. Ignition switch “ON".

Is passenger senslo less than 3.5 volts?

Ignition switch

“OFF."

Replace SDM .

Go to Step 7 Go to Chart A

7 1. Reconnect all components ensure all component are

properly mounted.

2. Clear diagnostic trouble codes.

Was this step finished?

Repeat the “SRS

Diagnostic System

Check" Go to Step 7

DTC 21 Driver Deployment Loop Resistance High

D09LX00001

Circuit Description:

When the ignition switch is turned “ON", the SDM will

perform tests to diagnose critical malfunctions within

itself. Upon passing these tests, “Ignition 1", and

deployment loop voltages are measured to ens ure they

are within their respective normal voltage ranges.

The SDM then proceeds with the “Resistance

Measurement Test" “Driver Bag Low" terminal “4" is

grounded through a current sink and the driver current

source connected to “Driver Bag High" terminal “3"

allows a known amount of current to flow. By

monitoring the voltage difference between “Driver Bag

High" and “Driver Bag Low", the SDM calculates the

combined resistance of the driver air bag assembly,

SRS coil assembly, harness wiring circuits IB05–YEL

and IB06–YEL/BLK, and connector terminal contact.

DTC Will Set When:

The combined resistance of the driver air bag assembly,

SRS Coil assembly, har ness wiring circuits IB05–YEL

and IB06–YEL/BLK, and connector terminal contact is

above a specified value. This test run once each

ignition cycle during the “Resistance Measurement

Test" when:

1. No “higher priority faults" are detected during “Turn–

ON"

2. “Ignition 1" voltage is in the specified value.

Action Taken:

SDM turns “ON" the “AIR BAG" war ning lamp and sets

DTC 21 .

DTC Will Clear When:

The ignition switch is turned “OFF".

DTC Chart Test Desc ription:

Number(s) below refer to step number(s) on the

diagno sti c ch art:

2. This test determines whether the malfunction is in the

SDM.

3. This test verifies proper connection of the yellow 2–

pin connector at the base of the steering column.

4. This test checks for proper contact and/or corrosion

of the 2–pin connector terminals at the base of

steering column.

5. This test isolate the malfunction to one side of the

SRS coil assembly yellow 2– pin connector located

at the base of the steering column.

6. This test determines whether the malfunction is due

to high resistance in the wiring.

7. This test determines whether the malfunction is in the

SRS coil assembly or the driver air bag assembly.

Diagnostic Aids:

An intermittent condition is likely to be caused by a poor

connection at terminals “1" and “2" of the SRS coil 2–

pin connector at the base of the steering column,

terminal “1" and “2" of the driver air bag assembly 2–pin

connector at the top of the steering column, SDM

terminals “3" and “4" or a poor wire to terminal

connection in circuit IB05–YEL or IB06–YEL/BLK. The

test for this diagnostic trouble code is only run while the

“AIR BAG" warnin g lamp is p erform ing the bulb check,

unless DTC 17 or DTC 26 is detected. When a scan

tool “Clear Codes" command is issued and the

malfunction is still present, the DTC will not reappear

until the next ignition cycle.

DTC 21 Driver Deployment Loop Resistance High

Step Action Yes No

1 Perform the “SRS Diagnostic System Check".

Was the “SRS Diagnostic System Check" performed? Go to Step 2

Repeat the “SRS

Diagnostic System

Check"

2 1. When measurements are requested in this chart use 5–

8840–0285–0 DVM with correct terminal adapter from 5–

8840–0385–0.

2. Use scan tool data list function, read and record the driver

deployment loop resis tan ce.

Is driver resistance more than 3.7 ohms? Go to Step 3 Go to Chart A

3 1. Ignition switch “OFF."

2. Disconnect SRS coil assembly yellow 2–pin connector

located at base of steering column is seated properly.

Is the 2–pin connector connected properly? Go to Step 4

Seat SRS coi l

assembly 2–pin

connector properly.

Go to Step 8

4 1. Disconnect and inspect the SRS coil assembly yellow 2–Pin

connector located base of steering column.

2. If ok, reconnect the SRS coil assembly yellow 2–pin

connector.

3. Ignition switch “ON."

Is DTC 21 current? Go to Step 5 Go to Step 8

5 1. Ignition switch “OFF."

2. Disconnect SRS coil and passenger air bag assembly, yello w

2–pin connector loc ated at the base of steer ing column a nd

behind the glove box assembly.

3. Connect SRS driver / passenger load tool 5–8840–2421–0

and appr opr iat e adapt er to S RS c oil and pa ssen ger air bag

assembly harness connectors.

4. Ignition switch “ON."

Is DTC 21 current? Go to Step 6 Go to Step 7

6 1. Ignition switch “Off. "

2. There has been a increase in the total circuit resistance of

the driver deployment loop.

3. Use the high resolution ohmmeter mode of the DVM while

checking circuits IB05–YEL and IB06–YEL/BLK, and SDM

connector terminal “3" and “4" to locate the root cause.

Was a fault found?

Replace SRS

harness.

Go to Step 8 Go to Chart A

7 1. Ignition switch “OFF."

2. Disconnect SRS driver / passenger load tool from SRS coil

assembly harness connector.

3. Connect SRS driver / passenger load tool 5–8840–2421–0

on the top of steering column.

4. Reconnect SRS coil assembly harness connector as the

base of steering column.

5. Ignition switch “ON."

Is DTC 21 current?

Ignition switch

“OFF."

Replace SRS coil

assembly.

Go to Step 8

Ignition switch

“OFF."

Replace driver air

bag assembly.

Go to Step 8

8 1. Reconnect all components ensure all component are

properly mounted.

2. Clear diagnostic trouble codes.

Was this step finished?

Repeat the “SRS

Diagnostic System

Check" Go to Step 8

Step Action Yes No

DTC 22 Driver Deployment Loop Resistance Low

D09LX00001

Circuit Description:

When the ignition switch is turned “ON", the SDM will

perform tests to diagnose critical malfunctions within

itself. Upon passing these tests “Ignition 1", and

deployment loop voltages are measured to ensure they

are within their respective normal voltage ranges.

The SDM then proceeds with the “Resistance

Measurement Test" “Driver Bag Low" terminal “4" is

grounded through a current sink and the driver current

source connected to “Driver Bag High" terminal “3"

allows a known amount of current to flow. By

monitoring the voltage difference between “Driver Bag

High" and “Driver Bag Low" the SDM calculates the

combined resistance of the driver air bag assembly,

SRS coil assembly, harness wiring circuits IB05–YEL

and IB06–YEL/BLK and connector terminal contact.

DTC Will Set When:

The combined resistance of the driver air bag assembly,

SRS Coil assembly, har ness wiring circuits IB05–YEL

and IB06–YEL/BLK and connector terminal contact is

above a specified value. This test is run once each

ignition cycle during the “Resistance Measurement

Test" when:

1. No “higher priority faults" are detected during “Turn–

ON"

2. “Ignition 1" voltage is in the specified value.

Action Taken:

SDM turns “ON" the “AIR BAG" war ning lamp and sets

DTC 22 .

DTC Will Clear When:

The ignition switch is turned “OFF."

DTC Chart Test Desc ription:

Number(s) below refer to circled number(s) on the

diagno sti c ch art:

2. This test determines whether the malfunction is in the

SDM.

3. This test verifies proper connection of the yellow 2–

pin connector at the base of the steering column.

4. This test checks for proper operation of the shor ting

clip in the yellow 2–pin connector.

5. This test isolate the malfunction to one side of the

SRS coil assembly yellow 2–pin connector located

at the base of steering column.

6. This test determines whether the malfunction is due

to shortening in the wiring.

7. This test determines whether the malfunction is in the

SRS coil assembly or the driver air bag assembly.

Diagnostic Aids:

An intermittent condition is lik ely to be caused by a short

between circuit IB05–YEL or IB06–YEL/BLK or a

malfunctioning shorting clip on the driver air bag

assembly or SRS coil assembly which would require

replacement of the component. The test for this

diagno stic trouble c ode is o nly r un while the “AIR B AG"

warning lamp is performing the bulb check, unless

DTC 17 or DTC 26 is detected. When a scan tool

“Clear Codes" c ommand i s issued and the malfunct ion

is st ill prese nt, the DTC wil l not reappe ar until the next

ignition cycle.

DTC 22 Driver Deployment Loop Resistance Low

Step Action Yes No

1 Perform the “SRS Diagnostic System Check."

WAS THE “SRS Diagnostic System Check" performed? Go to Step 2

Go to the “SRS

Diagnostic System

Check"

2 1. When measurements are requested in this chart use 5–

8840–0285–0 DVM with correct terminal adapter from 5–

8840–0385–0.

2. Use scan tool data list function, read and record the driver

deployment loop resis tan ce.

Is driver deployment loop resistance less than 1.7 OHMS? Go to Step 3 Go to Chart A

3 1. Ignition switch “OFF."

2. Make sure the SRS coil assembly yellow 2–pin connector

located at the base of steering column is seated properly.

Is the 2–pin connector connected properly? Go to Step 4

Seat driver air bag

assembly 2–pin

connector properly.

Go to Step 8

4 1. Disconnect and inspect the SRS coil assembly yellow 2–pin

connector located base of steering column.

2. If ok, reconnect the SRS coil assembly yellow 2–pin

connector.

3. Ignition switch “ON."

Is DTC 22 current? Go to Step 5 Go to Step 8

5 1. Ignition switch “OFF."

2. Disconn ect SR S coi l an d pass eng er air bag as s embly, yellow

2–pin connector located at the base of steering column and

behind the glove box assembly.

3. Connect SRS driver / passenger load tool 5–8840–2421–0

and appropriate adapter to SRS coil and passenger air bag

assembly harness connectors.

4. Ignition switch “ON."

Is DTC 22 current? Go to Step 6 Go to Step 7

6 1. Ignition switch “OFF."

2. There has been a decrease in the total circuit resistance of

the driver deployment loop.

3. Use the high resolution ohmmeter mode of the DVM while

checking circuits IB05–YEL and IB06–YEL/BLK, and SDM

connector terminal “3" and “4" to locate the root cause.

Was a f ault found?

Replace SRS

harness.

Go to Step 8 Go to Chart A

7 1. Ignition switch “OFF."

2. Disconnect SRS driver / passenger load tool from driver air

bag assembly harness connector.

3. Connect SRS driver / passenger load tool 5–8840–2421–0

to the top of steering column 2–pin connector.

4. Reconnect SRS coil assembly harness connector as the

base of steering column.

5. Ignition switch “ON."

Is DTC 22 current?

Ignition switch “off."

Replace SRS coil

assembly.

Go to Step 8

Ignition switch

“OFF."

Replace driver

air bag

assembly.

Go to Step 8

8 1. Reconnect all components, ensure all component are

properly mounted.

2. Clear diagnostic trouble codes.

Was this step finished?

Go to the “SRS

Diagnostic System

Check" Go to Step 8

Step Action Yes No

DTC 24 Driver Deployment Loop Short To Ground

D09LX00001

Circuit Description:

When the ignition switch is turned “ON", the SDM will

perform tests to diagnose critical malfunctions within

itself. Upon passing these tests, “Ignition 1", and

deployment loop voltages are measured to ensure they

are within their respective normal voltage ranges.

The SDM monitors the voltage at “Driver Bag Low"

ter mina l “4" an d “pass enger Bag Low" ter m inal “16 " to

detect shorts to ground in the air bag assembly circuits.

DTC Will Set When:

Neither of the two air bag assemblies is open.

“Ignitio n 1" is with in the normal op erating voltage range.

This test is run once each ignition cycle and

“Continuous Monitoring". Once these conditions are

met and the voltage at “Driver Bag Low" is below a

specified value, DTC 24 will set.

Action Taken:

SDM tur ns “ON" the “AIR B AG" war ning lamp and sets

a diagnostic trouble code.

DTC Will Clear When:

The malfunction is no longer occurring and the ignition

is turned “OFF".

DTC Chart Test Desc ription:

Number(s) below refer to step number(s) on the

diagno sti c ch art:

2. This test determines whether the SDM is

malfunctioning

3. This test isolates the malfunction to one side of the

SRS coil assembly yellow 2–pin connector at the

base of the steering column.

4. This test determines whether the malfunction is in

circuit IB05–YEL.

5. This test determines whether the malfunction is in

circuit IB06–YEL/BLK.

6. This test determines whether the malfunction is in the

SRS coil assembly or the driver air bag assembly.

Diagnostic Aids:

An intermittent condition is likely to be caused by a short

to ground in the driver air bag assembly circuit. Inspect

circuits IB05–YEL and IB06–YEL/BLK carefully for

cutting or chafing.

DTC 24 Driver Deployment Loop Short To Ground

Step Action Yes No

1 Was the “SRS Diagnostic System Check" performed?

Go to Step 2

Go to the “SRS

Diagnostic System

Check"

2 1. When measurements are requested in this chart use 5–

8840–0285–0 DVM with correct terminal adapter from 5–

8840–0385–0.

2. Ignition switch “OFF."

3. Connect scan tool data link connector. follow directions as

given in the scan tool operator's manual.

4. Ignition switch “ON."

5. Read driver sense LO.

Is driver sense LO less than 1.5 volts? Go to Step 3 Go to Chart A

3 1. Ignition switch “OFF."

2. Disconnect SRS coil assembly yellow 2–pin connector

located at base of the steering column. leave passenger air

bag assembly connected.

3. Connect SRS driver / passenger load tool 5–8840–2421–0

and appropriate adapter to SRS coil assembly harness

connector.

4. ignition switch “ON."

Is DTC 24 current? Go to Step 4 Go to Step 6

4 1. Ignition switch “OFF."

2. Disconnect SDM.

3. Disconnect SRS driver / passenger load tool.

4. Measure resistance on SDM harness connector “3" to

terminal “6" (ground).

Does 5–8840–0285–0 display “OL" (infinite)? Go to Step 5

Replace SRS

harness.

Go to Step 7

5 measure resistance on SDM harness connector from terminal

“4" to terminal “6" (ground).

Does 5–8840–0285–0 display “OL" (infinite)? Go to Chart A

Replace SRS

harness.

Go to Step 7

6 1. Ignition switch “OFF."

2. Disconn ect SRS dr i ver / passenger load t ool 5–8840– 2421–

0 from SRS coil assembly harness connector.

3. connect SRS driver / passenger load tool 5–8840–2421–0

and appropriate adapter 5–8840–0385–0 to driver air bag

assembly harness connector. located top of the steering

column 2–pin connector.

4. Reconnect SRS coil assembly harness connector as the

base of steering column.

5. Ignition switch “ON."

Is DTC 24 current?

Ignition switch

“OFF."

Replace SRS coil

assembly.

Go to Step 7

Ignition switch

“OFF."

Replace driver air

bag assembly.

Go to Step 7

7 1. Reconnect all components ensure all component are

properly mounted.

2. Clear diagnostic trouble codes.

Was this step finished?

Go to the “SRS

Diagnostic System

Check" Go to Step 7

DTC 25 Driver Deployment Loop Short To Voltage

D09LX00001

Circuit Description:

When the ignition switch is turned “ON", the SDM will

perform tests to diagnose critical malfunctions within

itself. Upon passing these tests, “Ignition 1", and

deployment loop voltages are measured to ensure they

are within their respective normal voltage ranges.

The SDM monitors the voltage at “Driver Bag Low"

ter m ina l “4" and “ Passenger B ag Low" term in al “ 16" t o

detect shorts to B+ in the air bag assembly circuits.

DTC Will Set When:

“Ignition 1" is in the normal operating voltage range.

This test is run once each ignition cycle and

“Continuous monitoring". Once these conditions are

met and the voltage at “Driver Bag Low" is above a

specified value, DTC 25 will set.

Action Taken:

SDM tur ns “ON" the “AIR B AG" war ning lamp and sets

DTC 25 and also DTC 71

DTC Will Clear When:

The SDM is replaced.

DTC Chart Test Desc ription:

Number(s) below refer to step number(s) on the

diagno sti c ch art:

2. This test determines whether the SDM is

malfunctioning.

3. This test isolates the malfunction to one side of the

driver air bag assembly yellow 2–pin connector at

the base of steering column.

4. This test determines whether the malfunction is in

circuit IB05–YEL.

5. This test determines whether the malfunction is in

circuit IB06–YEL/BLK.

6. This test determines whether the malfunction is in the

SRS coil assembly or the driver air bag assembly.

Diagnostic Aids:

An intermittent condition is likely to be caused by a short

to B+ in the driver air bag assembly circuit. Inspect

circuits IB05–YEL and IB06–YEL/BLK carefully for

cutting or chafing. If the wiring pigtail of the driver air

bag ass embly and SRS c oil assembly i s damaged , the

compon ents must b e replac ed. A careful inspec tion of

circuits IB05–YEL and IB06–YEL/BLK, including the

SRS coil assembly and driver air bag assembly is

essential to ensure that the replacement SDM will not

be damaged.

DTC 25 Driver Deployment Loop Short To Ignition

CAUTION: When DTC 25 has been set, it is necessary to replace the SDM. Setting DTC 25 will also cause

DTC 71 to set. When a scan tool “CLEAR CODES" command is issued and the malfunction is no longer

present, DTC 71 will remai n current. Ensure that the shor t to voltage condition is repaired prior to installing

a replacement SDM to avoid damaging the SDM.

Step Action Yes No

1 Was the “SRS Diagnostic System Check" performed?

Go to Step 2

Go to the “SRS

Diagnostic System

Check"

2 1. When measurements are requested in this chart use 5–

8840–0285–0 DVM with correct terminal adapter from 5–

8840–0385–0.

Ignition switch “OFF."

Connect scan tool data link connector. follow directions as

given in the scan tool operator's manual.

2. Ignition switch “ON."

3. Read driver sense LO .

Is driver sense LO more than 3.5 volts? Go to Step 3 Go to Chart A

3 1. Ignition switch “OFF."

2. Disconnect SRS coil assembly yellow 2–pin connector at the

base of the steering column. leave passenger air bag

assembly connected.

3. Connect SRS driver /passenger load tool 5–8840–2421–0

and appropriate adapter to SRS coil assembly harness

connector.

4. Ignition switch “ON."

Is driver sense LO more than 3.5 volts? Go to Step 4 Go to Step 6

4 1. Ignition switch “OFF."

2. Disconnect SDM.

3. Disconnect SRS driver /passenger load tool.

4. Measure resistance on SDM harness connector “3" to

terminal “12" (ignition).

Does 5–8840–0285–0 display “OL" (infinite)? Go to Step 5

Replace SRS

harness.

Go to Step 7

5 Measure resistance on SDM harness connector from terminal

“4" to terminal “12" (ignition).

Does 5–8840–0285–0 display “OL" (infinite)? Go to Chart A

Replace SRS

harness.

Go to Step 7

6 1. Ignition switch “OFF."

2. Disconn ect SRS dr i ver / passenger load t ool 5–8840– 2421–

0 and ap propriat e adapter 5–8840–0385– 0 to dr iver air b ag

assembly harness 2-pin connector located at top of the

steering column.

3. Reconnect SRS coil assembly harness connector as the

base of steering column.

4. Ignition switch “ON."

Is driver sense LO more than 3.5 volts?

Ignition switch

“OFF."

Replace SRS coil

assembly.

Go to Step 7

Ignition switch

“OFF."

Replace driver air

bag assembly.

Go to Step 7

7 1. Reconnect all components, ensure all component are

properly mounted.

2. Ignition switch “ON."

Is passenger sense Lo less than 3.5 volts?

Ignition switch

“OFF."

Replace SDM .

Go to Step 8 Go to Chart A

8 1. Reconnect all components ensure all component are

properly mounted.

2. Clear diagnostic trouble codes.

Was this step finished?

Go to the “SRS

Diagnostic System

Check" Go to Step 8

Step Action Yes No

DTC 26 Driver Deployment Loop Open

D09LX00001

Circuit Description:

When the ignition switch is turned “ON", the SDM will

perform tests to diagnose critical malfunctions within

itself. Upon passing these tests, “Ignition 1", and

deployment loop voltages are measured to ens ure they

are within their respective normal voltage ranges.

During “Continuous Monitoring" diagnostics, a fixed

amount of current is following in the deployment loop.

This produces proportional voltage drops in the loop.

By monitoring the voltage difference between “Driver

Bag High" and “Driver Bag Low", the SDM calculates

the combine d re si sta nc e of the driver air bag assem bly,

SRS coil assembly, harness wiring circuits IB05–YEL

and IB06–YEL/BLK, and connector terminal contact.

DTC Will Set When:

The voltage difference between “Driver Bag High"

terminal “3" and “Driver Bag Low" terminal “4" is above

or equal to a specified v alue f or 500 milliseconds during

“Continuous Monitoring".

Action Taken:

SDM tur ns “ON" the “AIR B AG" war ning lamp and sets

a diagnostic trouble code.

DTC Will Clear When:

The voltage difference between “Driver Bag High"

terminal “3" and “Driver Bag Low" terminal “4" is below

a specified value for 500 milliseconds during

“Continuous Monitoring".

DTC Chart Test Desc ription:

Number(s) below refer to step number(s) on the

diagno sti c ch art:

2. This test determines whether the malfunction is in the

SDM.

3. This test verifies proper connection of the yellow 2–

pin connector at the base of the steering column.

4. This test checks for proper contact and/or corrosion

of the yellow 2–pin connector at the base of the

steering column.

5. This test isolates the malfunction to one side of the

SRS coil assembly yellow 2–pin connector located

at the base of steering column.

6. This test determines whether the open is in the

wiring.

7. This test determines whether the malfunction is in the

SRS coil assembly or the driver air bag assembly.

Diagnostic Aids:

An intermittent co ndition is likely to be caused by a poor

connection at the driver air bag assembly harness 2–

pin connector terminals “1" and “2" at the top of the

steering column, SRS coil assembly harness 2–pin

connection terminals “1" and “2", SDM terminals “3" and “4", or an open in circuits IB05–YEL and IB06–

YEL/BLK.

DTC 26 Driver Deployment Loop Open

Step Action Yes No

1 Was the “SRS Diagnostic System Check" performed?

Go to Step 2.

Go to the “SRS

Diagnostic System

Check"

2 1. When measurements are requested in this chart use 5–

8840–0285–0 DVM with correct terminal adapter from 5–

8840–0385–0.

2. use scan tool data list function, read and record the driver

diff erential voltage.

Is driver VDIF more than 4 volts? Go to Step 3 Go to Chart A

3 1. Ignition switch “OFF."

2. Make sure the SRS coil assembly yellow 2–pin connector

located at the base of steering column is seated properly.

Is the yellow 2–pin connector connected properly? Go to Step 4

Seat driver air bag

assembly 2–pin

connector.

Go to Step 8

4 1. Disconn ect and inspect the SR S coil assembly yellow 2–pin

connector located base of steering column.

2. If ok, reconnect the SRS coil assembly yellow 2–pin

connector.

3. Ignition switch “ON."

Is DTC 26 current? Go to Step 5 Go to Step 8

5 1. Ignition switch “OFF".

2. Disconnect SRS coil and passenger air bag assembly, yello w

2–pin connectors located at the base of steering column and

behind the glove box assembly.

3. Connect SRS driver/passenger load tool 5–8840–2421–0

and appr opr iat e adapt er to S RS c oil a nd pas senger air b ag

assembly harness connectors.

4. Ignition switch “ON."

Is DTC 26 current? Go to Step 6 Go to Step 7

6 1. Ignition switch “OFF."

2. there has been an open circuit in the driver inflator

deployment loop.

3. use the high resolution ohmmeter mode of the DVM while

checking circuits IB05–YEL and IB06–YEL/BLK, and SDM

connector terminal “3" and “4" to locate the root cause.

Was a fault found?

Replace SRS

harness.

Go to Step 8 Go to Chart A

7 1. Ignition switch “OFF."

2. Disconnect SRS driver / passenger load tool from SRS coil

assembly harness connector.

3. connect SRS driver / passenger load tool 5–8840–2421–0 on

steering column 2–pin connector.

4. Reconnect SRS coil assembly harness connector at the

base of steering column.

5. Ignition switch “ON."

IS DTC 26 CURRENT?

Ignition switch

“OFF."

Replace SRS coil

assembly.

Go to Step 8

Ignition switch

“OFF."

Replace driver air

bag assembly.

Go to Step 8.

8 1. Reconnect all components ensure all component are

properly mounted.

2. Clear diagnostic trouble codes.

Was this step finished?

Repeat the “SRS

Diagnostic System

Check" Go to Step 8

DTC 51 Deployment Event Commanded

D09LX00001

Circuit Description:

The SDM contains a sensing device which converts

vehicle velocity changes to an electrical signal. The

electrical signal generated is processed by the SDM

and then compared to a value stored in memory. When

the generated signal exceeds the stored value, the

SDM will cause current to flow through the air bag

assembly deploying the air bags and causing DTC 51

to set.

DTC Will Set When:

The SDM detects a frontal crash, up to 30 degrees off

the centerline of the vehicle, of sufficient force to

warrant deployment of the air bags.

Action Taken:

SDM turns “ON" the “AIR BAG" warning lamp records

“Crash Data", and sets a diagnostic trouble code.

DTC Will Clear When:

The SDM is replaced.

DTC Chart Test Desc ription:

Number(s) below refer to step number(s) on the

diagno sti c ch art:

2. If air bag assemb ly (s) has not deploy ed, DTC 51 may

have falsely set.

3. If DTC 51 has set with no si gns of frontal impact, the

diagnostic trouble code has falsely set.

DTC 51 Deployment Event Commanded

WARNING: DURING SERVICE PROCEDURES. BE VERY CAREFUL WHEN HANDLING A SENSING AND

DIAGNOSTIC MODULE (SDM). NEVER STRIKE OR JAR THE SDM. NEVER POWER UP THE SRS WHEN THE

SDM IS NOT RIGIDLY ATTACHED TO THE VEHICLE. ALL SDM AND MOUNTING BRACKET FASTENERS MUST

BE CAREFULLY TORQUED AND THE ARROW MUST BE POINTING TOWARD THE FRONT OF THE VEHICLE

TO ENSURE PROPER OPERATION OF THE SRS. THE SDM COULD BE ACTIVATED WHEN POWERED WHILE

NOT RIGIDLY ATTACHED TO THE VEHICLE WHICH COULD CAUSE DEPLOYMENT AND RESULT IN

PERSONA L INJURY.

Step Action Yes No

1 Was the “SRS Diagnostic System Check" performed?

Go to Step 2.

Go to the “SRS

Diagnostic System

Check"

2 Ignition switch “OFF."

Have air bag assemblies deployed? Replace

components and

perform

inspections as

directed in “repairs

and inspections

required after an

accident" in this

section.

clear diagnostic

trouble codes.

Repeat “SRS

Diagnostic System

Check" Go to Step 3

3 Inspect front of vehicle and undercarriage for sings of impact.

Were signs of impact found? Replace

components and

perform

inspections as

directed in

“Repairs and

Inspections

Required After An

Acci den t" in thi s

section.

Clear diagnostic

trouble codes.

Repeat “SRS

Diagnostic System

Check"

Ignition switch

“OFF".

Replace SDM.

Reconnect all SRS

system

components,

ensure all

components are

properly mounted.

Repeat “SRS

Diagnostic System

Check"

DTC 53Deployment Commanded With Deployment Loop Fault Or Energy

Reserves Out Of Range

D09LX00001

Circuit Description:

The SDM contains a sensing drive which converts

vehicle velocity changes to an electrical signal. The

electrical signal generated is processed by the SDM

and then compared to a value stored in memory.

When the generated signal exceeds the stored value,

the SDM will cause current to flow through the ai r bag

assembly deploying the air bags. DTC 53 is set

accompa nying with D TC 51 w hen a deployment occurs

while an air bag assembly circuit fault is present that

could possible result in a no deployment situation in

one or both air bag assemblies.

DTC Will Set When:

The SDM detects a frontal crash, up to 30 degrees off

the centerline of the vehicle, of sufficient force to

warrant deployment of the air bags and an inflator

circuit fault is present..

Action Taken:

SDM turns “ON" the “AIR BAG" warning lamp records

“Crash Data", and sets a diagnostic trouble code.

DTC Will Clear When:

The SDM is replaced. If DTC 53 is set, one or more

DTCs will be s et in ad dit ion to DTC 53 . Mal fun ction (s)

setting DTC(s) (other than DTC 71) must be repaired

so that DTC(s) will not be set when a new SDM is

installed.

DTC Chart Test Desc ription:

Number(s) below refer to step number(s) on the

diagno sti c ch art:

2. If air bag assembly have not deployed, DTC 53 may

have falsely set.

3. If DTC 53 has set with no si gns of frontal impact, the

diagnostic trouble code has falsely set.

DTC53Deployment Commanded WITH Deployment Loop Fault Or Energy Reserves

Out Of Range

WARNING: DURING SERVICE PROCEDURES. BE VERY CAREFUL WHEN HANDLING A SENSING AND

DIAGNOSTIC MODULE (SDM). NEVER STRIKE OR JAR THE SDM. NEVER POWER UP THE SRS WHEN THE

SDM IS NOT RIGIDLY ATTACHED TO THE VEHICLE. ALL SDM AND MOUNTING BRACKET FASTENERS MUST

BE CAREFULLY TORQUED AND THE ARROW MUS T BE POINTING TOWARD THE FRONT OF THE VEHICLE

TO ENSURE PROPER OPERATION OF THE SRS. THE SDM COULD BE ACTIVATED WHEN POWERED WHILE

NOT RIGIDLY ATTACHED TO THE VEHICLE WHICH COULD CAUSE DEPLOYMENT AND RESULT IN

PERSONA L INJURY.

Step Action Yes No

1 Was the “SRS Diagnostic System Check" performed?

Go to Step 2

Go to the “SRS

Diagnostic System

Check"

2 Ignition switch “OFF."

Have air bag assembles deployed? Replace

components and

perform

inspections as

directed in

“Repairs And

Inspections

Required After An

Acci den t" in thi s

section.

Clear diagnostic

trouble codes.

Repeat the “SRS

Diagnostic System

Check" Go to Step 3

3 Inspect front of vehicle and undercarriage for signs of impact.

Were signs of impact found? Replace

components and

perform

inspections as

directed in

“Repairs And

Inspections

Required After An

Acci den t" in thi s

section.

Clear diagnostic

trouble codes.

Repeat “SRS

Diagnostic System

Check"

Ignition switch

“OFF."

Replace SDM.

Reconnect all SRS

system

components,

ensure all

components are

properly mounted.

Repeat the “SRS

Diagnostic System

Check"

DTC 61 Warning Lamp Circuit Failure

D09LX00001

Circuit Description:

When the i gniti on switch is tur n ed “ON" , battery voltage

is applied to the “AIR BAG" warning lamp and to the

“Ignition 1" input terminal “12". The SDM responds by

flashing the “AIR BAG" warning lamp seven times. The

SDM monito rs the lamp dr iver output by compar ing th e

output stat e at “ S RS War ni ng L amp " terminal “ 7" to th e

microprocessor commanded state. When “Ignition 1"

is in the specified value, and the output state does not

match the co mmanded sta te of the lamp dri ver for 500

milliseconds, DTC 61 is set.

DTC Will Set When:

“Ignition 1" voltage is in the specified value and the

output state at the “SRS Warning Lamp" terminal does

not match the commanded state of the lamp driver for

500 milliseconds. This test is run every 100

milliseconds during “Continuous Monitoring" tests and

once per each ignition cycle at the beginning.

Action Taken:

SDM attempts to turn “ON" the “AIR BAG" warning lamp

and sets a diagnostic trouble code.

DTC Will Clear When:

The ignition switch is turned “OFF."

Diagnostic Aids:

Refer to Charts B and C to diagnose warning lamp

circuit malfunctions.

DTC 61 Warning Lamp Circuit Failure

Step Action Yes No

1 Was the “SRS Diagnostic System Check" performed?

Go to Step 2

Go to the “SRS

Diagnostic System

Check"

2 1. Malfunctions within the “AIR BAG" warning lamp circuitry will

set this diagnostic trouble code.

2. These malfunctions are addressed in the “SRS Diagnostic

System Check" via Chart B and Chart C.

3. Failure to properly perform the “SRS Diagnostic System

Check" m ay result in misdiagnosis.

4. Ignition switch “ON."

5. Clear SRS diagnostic trouble codes.

IS DTC 61 set?

Ignition switch

“OFF."

Go to Chart A

Repeat the “SRS

Diagnostic System

Check"

DTC 71 Internal SDM Fault

D09LX00001

Circuit Description:

DTC 71 is an indication of a potential internal SDM

malfunction and will set if any of the following

conditions are detected:

1) Deployment or microprocessor energy reserve

failure.

2) EEPROM failure.

3) ROM failure.

4) RAM failure.

5) Calibration check sum failure.

6) Deployment switch faults.

7) Accelerometer fault.

8) Arming sensor fault.

9) Diagnostic current faults.

10) DTC 19

11) DTC 25

12) DTC 51

13) DTC 53

DTC Will Set When:

Any of the above indicated malfunctions are detected by

the SDM. The malfunctions described above are

tested mainly during “Continuous Monitoring" and

some ones run each ignition cycle.

Action Taken:

SDM turns “ON" the “AIR BAG" war ning lamp and sets

a diagnostic trouble code.

DTC Will Clear When:

A scan tool “Clear Codes" commanded is received by

the SD M. Some of th e indicate d malfunc tions w ill only

allow the “AIR BA G" warning lamp to go out.

But when DTC 19, 25, 51, 53 are also set, SDM is

replaced.

DTC 71 Internal SDM Fault

WARNING: DURING SERVICE PROCEDURES. BE VERY CAREFUL WHEN HANDLING A SENSING AND

DIAGNOSTIC MODULE (SDM). NEVER STRIKE OR JAR THE SDM. NEVER POWER UP THE SRS WHEN THE

SDM IS NOT RIGIDLY ATTACHED TO THE VEHICLE. ALL SDM AND MOUNTING BRACKET FASTENERS MUST

BE CAREFULLY TORQUED AND THE ARROW MUST BE POINTING TOWARD THE FRONT OF THE VEHICLE

TO ENSURE PROPER OPERATION OF THE SRS. THE SDM COULD BE ACTIVATED WHEN POWERED WHILE

NOT RIGIDLY ATTACHED TO THE VEHICLE WHICH COULD CAUSE DEPLOYMENT AND RESULT IN

PERSONAL INJURY.

CAUTION: When DTC 19 or 25 has been set, it is necessary to replace the SDM. Setting DTC 19 and 25 or 51

or 53 will also cause DTC 71 to set. When a scan tool “CLEAR CODES" command is issued and the

malfunction is no longer present, DTC 51 or 53 and DTC 71 will remain current. Ensure that the short to

volta ge condition DTC 19, 25 is repaired prior to installing a replacement SDM to avoid damaging the SDM.

Step Action Yes No

1 Was the “SRS Diagnostic System Check" performed?

Go to Step 2

Go to the “SRS

Diagnostic System

Check"

2 Note SRS “Diagnostic System Check."

IS DTC 19 OR 25 OR 51 OR 53 ALSO SET (CURRENT OR

HISTORY)? (REFER TO CAUTION ABOVE.)

Go to DTC 19 if

DTC 19 is set.

Go to DTC 25 if

DTC 25 is set.

Go to DTC 51 if

DTC 51 is set.

Go to DTC 53 if

DTC 53 is set.

Ignition switch

“OFF."

Replace SDM.

Repeat the “SRS

Diagnostic System

Check"