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MODEL SELECTION INDEX
MY2005 VZ Series - Service Information
Section 12J Body Control Module
1 General Information
1.1 Abbreviations
1.2 Body Control Module
1.3 Body Control Module Models
1.4 Body Control Module Features
Feature Table Key
Feature Table
2 System Operation
2.1 Body Control Module Operating Modes
Battery Saver Mode
Pre-delivery Mode
2.2 Serial Data Communication – V6
System Overview
V6 Serial Data Block Diagram
The GM LAN Bus System
UART Communications
Serial Data Bus
Data Bus Device Polling
Tech 2 and the Data Link Connector
Inputs and Outputs
GM LAN Data Bus
Serial Data Signal – Primary UART
Serial Data Signals – Secondary and Tertiary UART
Data Bus Device Polling
Data Messages
Powertrain Interface Module
2.3 Serial Data Communication – GEN III V8
System Overview
GEN III V8 Serial Data Block Diagram
UART and Class 2 Serial Data Bus
Data Bus Device Polling
Tech 2 and the Data Link Connector
Inputs and Outputs
Class 2 Serial Data Signal
Serial Data Signal – Primary UART
Serial Data Signal – Secondary and Tertiary UART
Data Bus Device Polling
Data Messages
Powertrain Interface Module
2.4 Serial Data Communication – GEN IV V8
System Overview
GEN IV V8 Serial Data Block Diagram
The GM LAN Bus System
UART Communications
Serial Data Bus
Data Bus Device Polling
Tech 2 and the Data Link Connector
Inputs and Outputs
GM LAN Data Bus
Serial Data Signal – Primary UART
Serial Data Signals – Secondary and Tertiary UART
Data Bus Device Polling
Data Messages
Powertrain Interface Module
2.5 Remote Receiver / Key
System Operation
Unlocking
Locking
Rear Compartment Lid Release
Remote Coded Key Battery Failure
Circuit Operation
2.6 Accessory Power Control
System Operation
Accessory Relay Shutdown Options
Wiper Control of the Accessory Relay
Circuit Operation
Radio On and Ignition Switch Input
2.7 Central Door Locking
System Operation
Door Locking
Door Unlocking
Deadlocking
Single-stage and Two-stage Unlocking
System Check
Key Locking
Remote Coded Key Check
Deadlocking Check
Door-lock Failure Warning
Auto Door-lock in Drive
Overheating Prevention
Functional Description of Door Locking/Unlocking Operation
Functional Diagram of Door Locking/Unlocking Operation
Circuit Operation
Unlocking
Locking
Door Input Signals
2.8 Rear Compartment Lid Release
System Operation
Circuit Operation
Power Supplies
Inputs
Outputs
2.9 Theft Deterrent System
System Operation
V6 and GEN IV V8 Engine
GEN III V8 Engine
Battery
Security Status Indicator
Circuit Operation
Power Supplies
Turn Signal Lamp Power
Inputs
Outputs
2.10 Entry Deterrent System
System Operation
Arming the System
Triggered Operation
Disarming Procedure
Multi-function Display (MFD) Trigger Point Displays
Remote Rear Compartment Release
Loss of Vehicle Battery Power
Circuit Operation
Power Supplies
Inputs
Outputs
2.11 Power Window System
System Operation
System Active
System Inactive
Automatic Down Operation of Front Windows
Lockout Switch
Circuit Operation
Ignition ON Input Signal
Driver and Front Passenger Window-down Circuit
Driver and Front Passenger Window-up Circuit
Rear Passenger Window Operation
2.12 Wiper System Intermittent Function
System Operation
Level 1 Vehicles
Level 2 and 3 Vehicles and AWD Wagon
Rear Wiper Operation AWD Wagon
Circuit Operation
Intermittent Wiper Switch
Wiper Dwell Controller
Vehicle Speed and Reverse Gear
Window Washer Switch
Rear Wiper Switch
Rear Washer Switch
2.13 Dome Lamp Delay Control
System Operation
Level 1 Vehicles
Level 2 and 3 Vehicles
Circuit Operation – Level 1 Vehicles
Inputs
Circuit Operation – Level 2 and 3 Vehicles
Inputs
2.14 Automatic Lamp Control
System Operation
Automatic Lights On
Automatic Lights Off
Approach Illumination
Circuit Operation – Lights On
Inputs
Power Supplies
Ground Circuits
Circuit Operation – Lights Off
Inputs
Power Supplies
Ground Circuits
2.15 Instrument Dimming Control
System Operation
Circuit Operation
Inputs
2.16 Air-conditioning Interface
System Operation
Circuit Operation
Inputs
Outputs
Blower Motor
2.17 Occupant Protection System Deployment Vehicle Shutdown
System Operation
OPS Deployment Signals
2.18 Priority Key System
Operating Parameters
Parameter Checks
Circuit Operation
2.19 Power Antenna Control
System Operation
Power Antenna
Circuit Operation
Antenna Up Switch Input Signal
Antenna Up Memory Height
Antenna Down
Antenna Auto-down
2.20 Heated Rear Window
System Operation
Delay Timer
Circuit Operation
Heated Rear Window Switch Input Signal
2.21 Rear Lamp Failure Warning System
System Operation
Components Monitored
Circuit Operation
Ground Circuit Monitoring
Rear Lamp Failure Warning Lamp
Inputs
2.22 Hazard Lamp Control
System Operation
Circuit Operation
3 Wiring Diagrams and Connector Charts
3.1 Wiring Diagrams – V6
Ignition Key, RX Sensor, Common Power and Grounds
Accessory Power Circuit
UART and GM LAN Communications – 5 Speed Automatic
UART and GM LAN Communications – 4 Speed Automatic with ESP
UART and GM LAN Communications – 4 Speed Automatic with with
Central Door Locking
Entry Deterrent, Warning Horns and Rear Compartment Solenoid
Entry Deterrent, Warning Horns and Rear Lift Glass Solenoid
Power Windows – Two Door Vehicles
Power Windows – Four Door Vehicles
Wiper Systems Intermittent Function – Utility, Regular & Cre
Wiper Systems Intermittent Function – Sedan, Level 2 and 3
Wiper Systems Intermittent Function – Wagon, Level 1
Wiper Systems Intermittent Function – Wagon, Level 2
Wiper Systems Intermittent Function – AWD Wagon, Level 1
Wiper Systems Intermittent Function – AWD Wagon, Level 2
Dome Lamp Delay Control – Utility, Regular & Crew Cab, Level
Dome Lamp Delay Control – Sedan and Wagon, Level 1
Dome Lamp Delay Control – Sedan and Wagon, Level 2 and 3
Automatic Lamp Control – Level 1
Automatic Lamp Control – Level 2 and 3
HVAC – Heated Rear Window and Air conditioning Interface – L
Radio and Power Antenna Control – Level 1
Radio and Power Antenna Control – Level 2 and 3
Rear Lamp Failure System – Level 3
Hazard Lamp Control, Theft / Turn Signal Lamp Flasher
3.2 Connector Charts – V6
3.3 Wiring Diagrams – GEN III V8
Ignition Key, RX Sensor, Common Power and Grounds
Accessory Power Circuit
UART and Class 2 Communications
Central Door Locking
Entry Deterrent, Warning Horns and Rear Compartment Solenoid
Entry Deterrent, Warning Horns and Rear Lift Glass Solenoid
Power Windows – Two Door Vehicles
Power Windows – Four Door Vehicles
Wiper Systems Intermittent Function – Utility, Regular & Cre
Wiper Systems Intermittent Function – Sedan, Level 2 and 3
Wiper Systems Intermittent Function – Wagon, Level 1
Wiper Systems Intermittent Function – Wagon, Level 2 and 3
Wiper Systems Intermittent Function – AWD Wagon, Level 2
Dome Lamp Delay Control – Utility, Regular & Crew Cab, Level
Dome Lamp Delay Control – Sedan and Wagon, Level 1
Dome Lamp Delay Control – Sedan and Wagon, Level 2 and 3
Dome Lamp Delay Control – Coupe, Level 2 and 3
Automatic Lamp Control – Level 1
Automatic Lamp Control – Level 2 and 3
HVAC – Heated Rear Window and Air conditioning Interface – L
Radio and Power Antenna Control – Level 1
Radio and Power Antenna Control – Level 2 and 3
Rear Lamp Failure System – Level 3
Hazard Lamp Control, Theft / Turn Signal Lamp Flasher
3.4 Connector Charts – GEN III V8
3.5 Wiring Diagrams – GEN IV V8
Ignition Key, RX Sensor, Common Power and Grounds
Accessory Power Circuit
UART and GM LAN Communications – 4 Speed Automatic with ESP
Central Door Locking
Entry Deterrent, Warning Horns and Rear Compartment Solenoid
Entry Deterrent, Warning Horns and Rear Lift Glass Solenoid - AWD Wagon only
Power Windows – Two Door Vehicles
Power Windows – Four Door Vehicles
Wiper Systems Intermittent Function – Utility, Regular & Crew Cab and Sedan, Level 1
Wiper Systems Intermittent Function – Sedan, Level 2 and 3
Wiper Systems Intermittent Function – Wagon, Level 1
Wiper Systems Intermittent Function – Wagon, Level 2
Wiper Systems Intermittent Function – AWD Wagon, Level 1
Wiper Systems Intermittent Function – AWD Wagon, Level 2
Dome Lamp Delay Control – Utility, Regular & Crew Cab, Level 1
Dome Lamp Delay Control – Sedan and Wagon, Level 1
Dome Lamp Delay Control – Sedan and Wagon, Level 2 and 3
Automatic Lamp Control – Level 1
Automatic Lamp Control – Level 2 and 3
HVAC – Heated Rear Window and Air conditioning Interface – Level 1
Radio and Power Antenna Control – Level 1
Radio and Power Antenna Control – Level 2 and 3
Rear Lamp Failure System – Level 3
Hazard Lamp Control, Theft / Turn Signal Lamp Flasher
3.6 Connector Charts – GEN IV V8
3.7 Connector Information
BCM Location and Wiring Connectors
BCM Connector Pin Identification
Legend – Circuit Type
Explanation of Terms
4 Tech 2 Information
4.1 Connecting Tech 2 For System Diagnosis
4.2 Tech 2 Test Modes and Displays
4.3 Normal Mode
4.4 Diagnostic Trouble Codes
Read DTC Information
Read Alarm Codes
Clear DTC and Alarm Codes
4.5 Data Display
Inputs and Outputs
BCM Internal Status
Serial Data Inputs
Priority 1 User Settings
Priority 2 User Settings
Alarm / Theft Deterrent
Central Door Locking
Power Windows
Wipers
Headlamps
Instrument Illumination
Interior Illumination
Rear Lamp Failure
Air-conditioning Interface
Antenna
System Identification
4.6 Snapshot
4.7 Miscellaneous Tests
Lamps
Interior Lamp
Headlamps
Indicators
Instrument Illumination
Auto Lights On
Rear Lamp Bulb Fail
Rear Stop Lamp Bulb Fail
Rear Lamp Fuse Fail
Data Bus Isolator
Central Locking
Rear Compartment
Wipers
Front Wipers
Rear Wiper
Power Windows
Driver’s Window Auto-down
Front Passenger’s Window Auto-down
Power Window Relay
Antenna
Horn
Interior Illumination Relay
Accessory Relay
Security System
Security LED
Theft Deterrent Horn
Key Priority
4.8 Program
User Settings
Instrument Illumination
Options
Antenna Height Memory
Set Key to Priority 1
Learn BCM Settings
Program Learnt BCM Settings
4.9 Security
BCM Link to ECM/PCM/PIM
Security Information
Program
5 Diagnostics
5.1 Introduction
5.2 Prerequisites to Diagnosis and Troubleshooting
Preliminary System Requirements
Pre-delivery Mode
Safety Requirements
Equipment and Checking
5.3 Diagnostic Trouble Code Definitions
Current Diagnostic Trouble Codes
History Diagnostic Trouble Codes
5.4 Description of Diagnostic Trouble Codes
Multiple Diagnostic Trouble Code Fault Condition
5.5 Intermittent Fault Conditions
Description
5.6 Diagnostic System Check
Description
Test Description
Diagnostic Table
5.7 Symptoms Diagnostics Table
5.8 Diagnostic Trouble Code List
5.9 Serial Data Communications
DTC Description
Circuit Description
Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
5.10 Remote Receiver / Key
Circuit Description
Remote Coded Key Battery Failure
Preliminary Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
Main Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
5.11 Accessory Power Control
Circuit Description
Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
5.12 Central Door Locking
System Overview
Unlocking the Doors Using the Driver’s Door Micro switch
Locking the Doors Using the Driver’s Door Micro switch
Door Locking System Test Overview
Diagnostic Trouble Codes
Conditions for Setting the DTC
Conditions for Clearing the DTC
Preliminary Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
Unlocking the Driver’s Door Using the Door Lock Diagnostic T
Test Description
Diagnostic Table Notes
Diagnostic Table
Unlocking the Driver’s Door Using the Door Snib Diagnostic T
Test Description
Diagnostic Table Notes
Diagnostic Table
Unlocking / Locking the Front Passenger’s Doors Using the Door Snib Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
Deadlocking the Vehicle’s Doors Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
Auto-door Locking (Gearshift In and Out of Park Position) Di
Test Description
Diagnostic Table Notes
Diagnostic Table
Door Ajar Switches Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
Rear Compartment Release Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
5.13 Theft Deterrent System
Circuit Description
V6 and GEN IV V8 Engines
GEN III V8 Engine
Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
5.14 Entry Deterrent System
Circuit Description
Preliminary Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
Main Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
Horn Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
5.15 Power Window System
Circuit Description
Introduction
Preliminary Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
Main Power Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
Front Window Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
Rear Windows Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
5.16 Wiper Systems Intermittent Function
Circuit Description
Preliminary Diagnostic Table – Front Wiper, Level 1
Test Description
Diagnostic Table
Preliminary Diagnostic Table – Front Wiper, Level 2 and 3
Test Description
Diagnostic Table
Preliminary Diagnostic Table – Rear Wiper, Wagon
Test Description
Diagnostic Table Notes
Diagnostic Table
Preliminary Diagnostic Table – Rear Wiper, AWD Wagon
Test Description
Diagnostic Table
Intermittent Diagnostic Table – Front Wipers, Level 1
Test Description
Diagnostic Table Notes
Diagnostic Table
Intermittent Diagnostic Table – Front Wiper, Level 2 and 3
Test Description
Diagnostic Table Notes
Diagnostic Table
Intermittent Diagnostic Table – Rear Wiper, Wagon
Test Description
Diagnostic Table Notes
Diagnostic Table
Intermittent Diagnostic Table – Rear Wiper, AWD Wagon
Test Description
Diagnostic Table Notes
Diagnostic Table
Road Speed Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
5.17 Dome Lamp Delay Control
Circuit Description
Level 1 vehicles
Level 2 and 3 vehicles
Coupe
All vehicles
Battery Saver Mode
Preliminary Diagnostic Table – Utility and Regular & Crew Ca
Test Description
Diagnostic Table Notes
Diagnostic Table
Preliminary Diagnostic Table – Sedan and Wagon, Level 1
Test Description
Diagnostic Table Notes
Diagnostic Table
Preliminary Diagnostic Table – Sedan and Wagon, Level 2 and
Test Description
Diagnostic Table Notes
Diagnostic Table
Preliminary Diagnostic Table – Coupe
Test Description
Diagnostic Table Notes
Diagnostic Table
Main Diagnostic Table – Utility and Regular & Crew Cab Level
Test Description
Diagnostic Table Notes
Diagnostic Table
Main Diagnostic Table – Sedan and Wagon, Level 1
Test Description
Diagnostic Table Notes
Diagnostic Table
Main Diagnostic Table – Sedan and Wagon, Level 2 and 3
Test Description
Diagnostic Table Notes
Diagnostic Table
Main Diagnostic Table – Coupe
Test Description
Diagnostic Table Notes
Diagnostic Table
5.18 Automatic Lamp Control
Circuit Description
Automatic Lamps Off
Automatic Lamps On
Adjustment
Approach Illumination
Preliminary Diagnostic Table
Test Description
Diagnostic Table
Sunload Sensor Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
Lamps On / Lamps Off Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
5.19 Instrument Dimming Control
Circuit Description
Preliminary Diagnostic Table
Test Description
Diagnostic Table
Main Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
5.20 Air-conditioning Interface
Circuit Description
Preliminary Diagnostic Table
Test Description
Diagnostic Table
Main Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
5.21 OPS Deployment Vehicle Shutdown
Circuit Description
Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
5.22 Priority Key System
Circuit Description
Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
5.23 Power Antenna Control
Circuit Description
Diagnostic Table
Test Description
Diagnostic Table Notes
Diagnostic Table
5.24 Heated Rear Window
Circuit Description
Preliminary Diagnostic Table
Test Descriptions
Diagnostic Table
Main Diagnostic Table
Test Descriptions
Diagnostic Table Notes
Diagnostic Table
5.25 Rear Lamp Failure Warning System
Circuit Description
Preliminary Diagnostic Table
Test Descriptions
Diagnostic Table
Main Diagnostic Table
Test Descriptions
Diagnostic Table Notes
Diagnostic Table
5.26 Hazard Lamp Control
Circuit Description
Preliminary Diagnostic Table
Test Descriptions
Diagnostic Table
Main Diagnostic Table
Test Descriptions
Diagnostic Table Notes
Diagnostic Table
6 Service Operations
6.1 Body Control Module
Mounting Location
BCM Preliminary Information
Remove
Access to BCM Without Disconnection
Removal
Reinstall
Original BCM
Replacement BCM (New)
BCM Relearn Procedure
6.2 Remote Coded Key
Key Replacement
6.3 Power Window A and B Door Pillar Wiring Loom Connectors
A Pillar X500 and X600 Connectors
Remove
Reinstall
B Pillar X700 and X800 Connectors
Remove
Reinstall
6.4 Bulb Re-learn Procedure Rear Lamp Warning Failure System
7 Torque Wrench Specifications
8 Special Tools
