SECTION 12M1 - SRS RESTRAINT CONTROL SYSTEM

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 B+

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 B+

DTC 26 Driver Deployment Loop Open

DTC 51 Air Bag 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: IF SO EQUIPPED WITH 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.

HOLDEN will call out those fasteners that require a

replacement after removal. HOLDEN 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 force, and may damage the

fastener. When 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 TECH 2.scan tool.

How To Clear Trouble Codes

Trouble codes can only be cleared by using a TECH 2.

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 memory card 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 (pin 24) to the DLC connector

(pin 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 code diagnostics is enabled by grounding by pin

4 shorting to pin 13 of the DLC connector with the

ignition switch“ON”. Grounding pin 4 of the DLC

connector pulls the “Diagnostics Request” input (pin 1)

of the SDM low and signals the SDM to enter the flash

code diagnostic display mode.

The SDM displays the trouble codes by flashing the

warning lamp. Each code that is displayed will consist

of a number of flashes which represents the tens digit,

a 1.2 second pause, following by a number of flashes

which represents the ones digit of the code. Each code

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 pin 4 of the DLC connector.

Two special codes exist when reading in 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 pin 4. “flash Code 13”will be displayed if

history codes are present. To read the history codes a

scan tool must be used.

System Schematic

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SRS Diagnostic System Check

The diagnostic procedures used in this section are

designed to find and repair SRS malfunctions. To get

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

starting point of any SRS diagnostics. The “SRS

Diagnostic System Check” checks for proper “AIR

BAG” warning lamp operation, the ability of the

SDM to communicate through the “Serial Data” line

and whether SRS diagnostic trouble codes exist.

B 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

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 all repair or diagnostic procedures will ensure

that the repair has been made correctly and that no

other malfunctions exist

Circuit Description

When the ignition switch is first turned “ON”, “Ignition 1”

voltage is applied from the “C–21” fuse to the SDM at

the “Ignition 1” input pin “12”. The SDM responds by

illuminating the “AIR BAG” warning lamp for 3.5 secs.

while performing tests on the Supplemental Restraint

System.

Notes On System Check Chart:

1. The “AIR BAG” warning lamp should turn on 3.5

seconds after ignition is first turned“ON”.

2. After the “AIR BAG” warning lamp turn on 3.5

seconds, it should turn “OFF”

3. This test checks for the proper operation of the

“Serial Data” line. This test will also determine

whether history diagnostic trouble codes are stored

and, if so, identify them.

4. Improper operation of the “AIR BAG” warning 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 DTC’s are diagnosed is very

important. Failure to conduct diagnosis 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 turn on 3.5 seconds? Go to Step 2 Go to Step 3

2 Note the “AIR BAG” warning lamp after it turn on 3.5 seconds.

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

turned “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 the SRS diagnostic trouble code display, recode all

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

order

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

Ignition “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

malfunctons, no

further

diagnosis is

required

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?

NOTE: IMPORTANT

When Multiple DTC’s are set, diagnose in the following order:—

DTC 53, DTC 51, DTC 19, DTC 25.

Remaining current DTCs from lowest number to the to highest.

When only history DTCs exist, refer to “Diagnostic Aids” for that

specific DTC

A history DTC indicates the malfunction has been repaired or is

intermittent

Refer to NOTE SRS is

functional and

free of

malfunctons, no

further

diagnosis is

required

Chart A SDM Integrity Check

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Circuit Description:

The “AIR BAG” warning lamp will be turned on for 3.5

seconds when the voltage applied to SDM pin 12 is

greater than 9 volts. During this time period, the SDM

performs “Turn–ON” tests followed by “Continuous

Monitoring” tests. When a malfunction is detected, the

SDM sets a Diagnostic Trouble Code (DTC) and

illuminates the “AIR BAG” warning lamp.

The SDM will clear any Current Diagnostic Trouble

Codes (except DTCs 19, 25, 51, 53 and 71) and move

them to a history file when the malfunction is no longer

detected and/or the ignition switch is cycled.

DTCs 19, 25, 51and 53 - Require replacement of the

SDM after the necessary circuit repairs have been

carried out. These DTC’s CANNOT be cleared with

TECH 2.

DTC 71 - Internal SDM Fault, can only be cleared using

the TECH 2 “Clear Codes” command.

NOTE:

A DTC 71 cannot be cleared by TECH 2 if a DTC 51 or

a DTC 53 is also set.

Chart Test Description:

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

diagnostic chart:

1. This test confirms a current malfunction. If no

current malfunction is occurring (history DTC set)

the “Diagnostic Aids” for the appropriate diagnostic

trouble code should be referenced. The SDM should

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 found 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. Diagnostic procedures must be performed to verify the need

for SDM replacement.

3. Ignition switch“OFF”.

4. Reconnect all SRS components, ensure all components 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 turn on 3.5 seconds 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 performed?

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 turn on 3.5 seconds 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

properly mounted.

Was this step finished?

Repeat the “SRS

Diagnostic System

Check” Go to Step 4

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

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Circuit Description:

When the ignition switch is turned “ON”, battery voltage

is applied to SDM pin 7 via Fuse C-10 and the “AIR

BAG” warning lamp. Battery voltage is also applied to

SDM pin 12 via Fuse C-21.

The SDM responds by turning on the “AIR BAG”

warning lamp 3.5 seconds.

NOTE:

If voltage applied to pin 7 is less than 9 volts, the “AIR

BAG” warning lamp will come “ON” steady, but the

SDM will not set a DTC.

Chart Test Description:

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

diagnostic chart.

2. This test checks for an open in the “Ignition 1” circuit

to the SDM.

3. This test checks the voltage value of “IGNITION 1”.

4. This test determines whether the malfunction is a

short to ground in IB04–WHT/RED.

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 pin adapter from 5–8840–

0385–0.

2. Ignition switch “OFF.”

3. Connect scan tool to data link connector - Refer to Section

0C - and turn the Ignition switch “ON.”

4. Request SRS diagnostic trouble code display.

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” less 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 pin “7” to

ground pin “6”.

Doesthe DVM display “OL” (Infinity)? Go to Chart A

Replace SRS

harness

Go to Step 5

5 Reconnect all SRS components, ensure all components are

properly mounted.

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

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Circuit Description:

When the ignition switch is turned “ON”, battery voltage

is applied to SDM pin 7 via Fuse C-10 and the “AIR

BAG” warning lamp. Battery voltage is also applied to

SDM pin 12 via Fuse C-21.

The SDM responds by turning on the “AIR BAG”

warning lamp 3.5 seconds.

NOTE:

If voltage applied to pin 7 is more than 16 volts, the “AIR

BAG” warning lamp NOT illuminate, and the SDM will

NOT set a DTC.

Chart Test description:

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

diagnostic chart:

1. This test decides whether power is available to SDM

warning lamp power feed circuit.

2. This test determines 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

circuitry.

5. This test isolates the IB04–WHT/RED circuit and

checks for a short in the IB04–WHT/RED 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 pin adapter from 5–8840–

0385–0.

2. Ignition switch “OFF.”

3. Remove and inspect “C–10” fuse (meter) to the “AIR BAG”

warning lamp.

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 pin “7” to

pin “6” (ground).

Is system voltage present on pin“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 IB04–

WHT/RED pin.

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

Is bulb good? Go to Step 5

Replace 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 pin “7” to

pin “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 IB04–WHT/RED pin to SDM harness connector

pin“7”.

Is resistance 5.0 ohms or less?

Service

instrument

meter cluster

Install

instrument

meter cluster

Go to Step 6

Replace SRS

harness

Go to Step 6

6 Reconnect all SRS components, ensure all components are

properly mounted.

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 “C–10” fuse.

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

“Off. ”

3. Remove and inspect “C–10” fuse.

Is fuse good?

Install “C–10”

fuse

Go to Step 10 Go to Step 9

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

Yellow 2–pin connectors located at base of steering column

and behind the glove box assembly.

2. Disconnect SDM.

3. Replace “C–10” fuse.

4. Ignition switch “ON” wait 10 seconds.

5. Ignition switch“OFF”.

6. Remove and inspection “C–10” fuse.

Is fuse good?

Install“C–10”

fuse

Go to Chart A

Replace SRS

harness

Replace “C–10”

fuse

Go to Step 10

10 Reconnect all SRS components, ensure all components are

properly mounted.

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

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Circuit Description:

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

perform tests to diagnose critical malfunctions within

itself. Upon passing these tests, the “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”. SDM pin 16 (Passenger Bag Low)

is grounded through a resistor and the passenger

circuit power source is connected to SDM pin 15

(Passenger Bag High) 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 IB07–

YEL/GRN and IB08–YEL/RED connector pin contact.

DTC Will Set When:

The combined resistance of the passenger air bag

assembly, harness wiring IB07–YEL/GRN and IB08–

YEL/RED, and connector pin 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” warning lamp and sets a

diagnostic trouble code.

DTC Will Clear When:

The ignition switch is turned “OFF.”

DTC Chart Test Description:

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

diagnostic chart:

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 pin .

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 condition is likely to be caused by a poor

connection at the passenger air bag assembly harness

connector pins “1” and“2”, SDM pin “15” and“16”, or a

poor wire to pin connection in IB07–YEL/GRN and

IB08–YEL/RED. This test for this diagnostic 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” command is

issued and the malfunction is still present, the DTC will

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 pin 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

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 15 current? Go to Step 5 Go to Step 7

5 1. Ignition switch “Off.”

2. Disconnect SRS coil and passenger air bag assembly,

yellow 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 appropriate adapters to SRS coil and passenger air bag

assembly harness connectors.

4. Ignition switch “ON.”

Is DTC 15 Current? Go to Step 6

Ignition switch

“Off”

Replace the

passenger air

bag assembly

Go to Step 7

6 1. Ignition switch “Off.”

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

the passenger inflator deployment loop.

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

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

connector pin “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

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Circuit Description:

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

perform tests to diagnose critical malfunctions within

itself. Upon passing these tests, the “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”. SDM pin 16 (Passenger Bag Low)

is grounded through a resistor and the passenger

circuit power source is connected to SDM pin 15

(Passenger Bag High) 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 IB07–

YEL/GRN and IB08–YEL/RED connector pin contact.

DTC Will Set When:

The combined resistance of the passenger air bag

assembly, harness wiring IB07–YEL/GRN and IB08–

YEL/RED, and connector pin 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” warning lamp and sets a

diagnostic trouble code.

DTC Will Clear When:

The ignition switch is turned “OFF.”

DTC Chart Test Description:

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

diagnostic chart:

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 shorting

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 IB07–YEL/GRN and IB08–YEL/RED, 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 performing

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 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 pin 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,

yellow 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 appropriate adapters to SRS coil and passenger air bag

assembly harness connectors.

4. Ignition switch “ON.”

Is DTC 16 current? Go to Step 6

Ignition switch

“Off”

Replace the

passenger air

bag 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 IB07–YEL/GRN and IB08–YEL/RED, and SDM

connector pin “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

D09RW014

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 SDM pin

16 (Passenger Bag Low) and SDM pin 15 (Passenger

Bag High), the SDM calculates the combined

resistance of the passenger air bag assembly, harness

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

connector pin contact.

DTC Will Set When:

The voltage difference between “Passenger Bag High”

pin “15” and “Passenger Bag Low” pin “16” is above or

equal to a specified value for 500 milliseconds

during“Continuous Monitoring”.

Action Taken:

SDM turns “ON” the “AIR BAG” warning lamp and sets a

diagnostic trouble code.

DTC Will Clear When:

The voltage difference between SDM pin 16 (Passenger

Bag Low) and SDM pin 15 (Passenger Bag High) is

below a specified value for 500 milliseconds

during“Continuous Monitoring”.

DTC Chart Test Description:

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

diagnostic chart:

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

pins.

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 condition is likely to be caused by a poor

connection at the passenger air bag assembly harness

connector pins“2” and“3”, SDM pins “15” and“16”, or an

open in IB07–YEL/GRN and IB08–YEL/RED.

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 pin adapter from 5–8840–

0385–0.

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

passenger differential voltage.

Is passenger VDIF 0.425 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,

yellow 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 appropriate adapters to SRS coil and passenger air bag

assembly harness connectors.

4. Ignition switch “ON.”

Is DTC 17 current? Go to Step 6

Ignition switch

“Off”

Replace the

passenger air

bag assembly

Go to Step 7

6 1. Ignition switch “Off.”

2. There has been an open circuit resistance in the passenger

deployment loop.

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

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

connector pin “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

D09RW014

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 voltages between SDM pin 4

(Driver Bag Low) and (Passenger Bag Low) to detect

short to ground in the air bag assembly circuits.

DTC Will Set When:

Neither of the two air bag assemblies is open.

“Ignition 1”is within the normal operating 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 turns “ON” the “AIR BAG” warning lamp and sets a

diagnostic trouble code.

DTC Will Clear When:

This malfunction is no longer occurring and the ignition

switch is turned“OFF”.

DTC Chart Test Description:

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

diagnostic chart.

2. This test determines whether the SDM is

malfunctioning.

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

passenger air bag assembly yellow 2–pin

connector behind glove box assembly.

4. This test determines whether the malfunction is in

IB07–YEL/GRN.

5. This test determines whether the malfunction is in

IB08–YEL/RED.

Diagnostic Aids:

An intermittent condition is likely to be caused by a short

to ground in the passenger air bag assembly circuit.

Inspect IB07–YEL/GRN and IB08–YEL/RED 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 pin 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 bag sense LO.

Is passenger bag 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

passenger 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 pin

“15” to pin “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 pin “16” to

pin “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 B+

D09RW014

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 voltages between SDM pin 4

(Driver Bag Low) and (Passenger Bag Low) to detect

short to B+ in the air bag assembly circuits.

DTC Will Set When:

“Ignition 1” is within the normal operating 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 turns “ON” the “AIR BAG” warning lamp and sets

DTC 19 and also DTC 71.

DTC Will Clear When:

The SDM is replaced.

DTC Chart Test Description:

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

diagnostic chart:

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 yellow 2–pin

connector behind glove box assembly.

4. This test determines whether the malfunction is in

IB07–YEL/GRN.

5. This test determines whether the malfunction is in

IB08–YEL/RED.

Diagnostic Aids:

An intermittent condition is likely to be caused by a short

to B+ in the passenger air bag assembly circuit.

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

for cutting or chafing. If the wiring pigtail of the

passenger air bag assembly is damaged, the

component must be replaced. A careful inspection of

IB07–YEL/GRN and IB08–YEL/RED, 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 B+

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 current. Ensure that the short 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 pin 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 bag sense LO.

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

Ignition switch

“OFF”

Replace

passenger 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 pin

“15” to pin “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 pin “16”

and pin “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 bag 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

D09RW014

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”. SDM pin 4 (Driver Bag Low) is

grounded through a current sink and the driver current

source connected to SDM pin 3 (Driver Bag High)

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 IB05–YEL and

IB06–YEL/BLK, and connector pin contact.

DTC Will Set When:

The combined resistance of the driver air bag assembly,

SRS Coil assembly, harness wiring IB05–YEL and

IB06–YEL/BLK, and connector pin 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” warning lamp and sets

DTC 21.

DTC Will Clear When:

The ignition switch is turned“OFF”.

DTC Chart Test Description:

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

diagnostic chart:

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 pins 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 pins “1” and “2”of the SRS coil 2–pin

connector at the base of the steering column, pin “1”

and “2”of the driver air bag assembly 2–pin connector

at the top of the steering column, SDM pins “3” and “4”

or a poor wire to pin connection in IB05–YEL or IB06–

YEL/BLK. The test for this diagnostic 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” 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 pin adapter from 5–8840–

0385–0.

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

deployment loop resistance.

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 coil

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,

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 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 IB05–YEL and IB06–YEL/BLK, and SDM

connector pin “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

D09RW014

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”. SDM pin 4 (Driver Bag Low) is

grounded through a current sink and the driver current

source connected to SDM pin 3 (Driver Bag High)

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 IB05–YEL and

IB06–YEL/BLK and connector pin contact.

DTC Will Set When:

The combined resistance of the driver air bag assembly,

SRS Coil assembly, harness wiring IB05–YEL and

IB06–YEL/BLK and connector pin 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” warning lamp and sets

DTC 22.

DTC Will Clear When:

The ignition switch is turned “OFF.”

DTC Chart Test Description:

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

diagnostic chart:

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 shorting

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 likely to be caused by a short

between 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

diagnostic 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” command is issued and the malfunction

is still present, the DTC will not reappear 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 pin adapter from 5–8840–

0385–0.

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

deployment loop resistance.

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. Disconnect SRS coil and passenger air bag assembly, 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 IB05–YEL and IB06–YEL/BLK, and SDM

connector pin “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 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

D09RW014

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 SDM pin 4 (Driver Bag

Low) and SDM pin 16 (Passenger Bag Low) to detect

shorts to ground in the air bag assembly circuits.

DTC Will Set When:

Neither of the two air bag assemblies is open.

“Ignition 1”is within 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 below a

specified value, DTC 24 will set.

Action Taken:

SDM turns “ON” the “AIR BAG” warning 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 Description:

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

diagnostic chart:

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

IB05–YEL.

5. This test determines whether the malfunction is in

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

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 pin 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 bag sense LO.

Is driver bag 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 pin “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 pin “4” to

pin “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. Disconnect SRS driver / passenger load tool 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 B+

D09RW014

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 SDM pin 4 (Driver Bag

Low) and SDM pin 16 (Passenger Bag Low) to 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 turns “ON” the “AIR BAG” warning lamp and sets

DTC 25 and also DTC 71

DTC Will Clear When:

The SDM is replaced.

DTC Chart Test Description:

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

diagnostic chart:

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

IB05–YEL.

5. This test determines whether the malfunction is in

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

IB05–YEL and IB06–YEL/BLK carefully for cutting or

chafing. If the wiring pigtail of the driver air bag

assembly and SRS coil assembly is damaged, the

components must be replaced. A careful inspection of

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 B+

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 remain current. Ensure that the short to B+ 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 pin 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 bag sense LO .

Is driver bag 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 bag 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 pin

“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 pin “4” to

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

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

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 bag 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 driver bag senslo 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

DTC 26 Driver Deployment Loop Open

D09RW014

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 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 combined resistance of the driver air bag assembly,

SRS coil assembly, harness wiring IB05–YEL and

IB06–YEL/BLK, and connector pin contact.

DTC Will Set When:

The voltage difference between SDM pin 3 (Driver Bag

High) and SDM pin 4 (Driver Bag Low) is above or equal

to a specified value for 500 milliseconds

during“Continuous Monitoring”.

Action Taken:

SDM turns “ON” the “AIR BAG” warning lamp and sets a

diagnostic trouble code.

DTC Will Clear When:

The voltage difference between SDM pin 3 (Driver Bag

High) and SDM pin 4 (Driver Bag Low) is below a

specified value for 500 milliseconds during“Continuous

Monitoring”.

DTC Chart Test Description:

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

diagnostic chart:

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 condition is likely to be caused by a poor

connection at the driver air bag assembly harness 2–

pin connector pins “1” and “2” at the top of the steering

column, SRS coil assembly harness 2–pin connection

pins “1” and“2”, SDM pins “3” and“4”, or an open in

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 pin adapter from 5–8840–

0385–0.

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

differential voltage.

Is driver VDIF more than 4.25 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. 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 26 current? Go to Step 5 Go to Step 8

5 1. Ignition switch“OFF”.

2. Disconnect SRS coil and passenger air bag assembly,

yellow 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 appropriate adapter to SRS coil and passenger air bag

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 IB05–YEL and IB06–YEL/BLK, and SDM

connector pin “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 Air Bag Deployment Event Commanded

D09RW014

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 Description:

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

diagnostic chart:

2. If air bag assembly (s) has not deployed, DTC 51

may have falsely set.

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

diagnostic trouble code has falsely set.

DTC 51 Air Bag 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

PERSONAL 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 Accident” in

this 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 53 Deployment Commanded With Deployment Loop Fault Or Energy Reserves

Out Of Range

D09RW014

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 air bag

assembly deploying the air bags. DTC 53 is set

accompanying with DTC 51 when 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 set in addition to DTC 53. Malfunction(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 Description:

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

diagnostic chart:

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

have falsely set.

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

diagnostic trouble code has falsely set.

DTC 53 Deployment 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 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 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 Accident” in

this 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 Accident” in

this 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

D09RW014

Circuit Description:

When the ignition switch is turned“ON”, battery voltage

is applied to the “AIR BAG” warning lamp and to SDM

pin 12 (Ignition-1 input). The SDM responds by turning

on the “AIR BAG” warning lamp for 3.5 seconds. The

SDM monitors the lamp driver output by comparing the

output state at SDM pin 7 (SRS Warning Lamp) to the

microprocessor commanded state. When “Ignition 1”

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

match the commanded state of the lamp driver for 500

milliseconds, a 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” pin 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 at the

beginning of each ignition cycle.

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 Chart B and Chart 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” may 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

D09RW014

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” warning lamp and sets a

diagnostic trouble code.

DTC Will Clear When:

A scan tool “Clear Codes” commanded is received by

the SDM. Some of the indicated malfunctions will only

allow the “AIR BAG” 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

voltage 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 NOTICE 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”