GM Service Manual Online
For 1990-2009 cars only

Body Control Module (BCM)

Ignition ON/Engine OFF/Vehicle in PARK/Headlamps in AUTO

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Julian Date of Build

Module Information 1

Numeric

Varies

Manufacture Enable Counter

Module Information 1

0-255

0

Module Part Number

Module Information 1

Numeric

Varies

Software Design Suffix

Module Information 1

Two Letters

Varies

Software Part Number

Module Information 1

Numeric

Varies

Lighting Calibration Number

Module Information 2

Numeric

Varies

Lighting Suffix

Module Information 2

Two Letters

Varies

Reminder Calibration Number

Module Information 2

Numeric

Varies

Reminder Suffix

Module Information 2

Two Letters

Varies

Retained Accessory Power Calibration Number

Module Information 2

Numeric

Varies

Retained Accessory Power Suffix

Module Information 2

Two Letters

Varies

Security Calibration Number

Module Information 2

Numeric

Varies

Security Suffix

Module Information 2

Two Letters

Varies

Ambient Light

Data

DARK/LIGHT

LIGHT (DRL ON) DARK (AHL ON)

Ambient Light Sensor

Data

Volts

4.7 Volts Maximum Light to 1.0 Volt Maximum Dark

Battery Voltage

Data

Volts

Varies

Courtesy Lamp Timer

Data

Seconds

0 Seconds

Dimming Potentiometer

Data

Volts

Varies

High Beam Input

Data

Volts

12.2 - Low Beams 0.8 - High Beams

Inadvertent Power Timer

Data

Seconds

2400 Seconds

Retained Accessory Power Timer

Data

Seconds

1198 Seconds

Vehicle Speed

Data

MPH

0

Cargo Lamp Switch

Input 1

ON/OFF

OFF

Door Handle Switch

Input 1

ACTIVE/INACTIVE

ACTIVE (door open)

Door Lock Relay Feedback

Input 1

ON/OFF

OFF (relay not energized)

Driver Door Jamb Switch

Input 1

ACTIVE/INACTIVE

ACTIVE (door open)

Horn Relay Input

Input 1

ACTIVE/INACTIVE

INACTIVE

Ignition 1

Input 1

ACTIVE/INACTIVE

ACTIVE

Ignition 3

Input 1

ACTIVE/INACTIVE

ACTIVE

Ignition Power Mode

Input 1

OFF/RUN/CRANK/ UNKNOWN

RUN

Key In Ignition

Input 1

YES/NO

YES

Last Remote Function Actuation Command Since Wake-Up

Input 1

None/Lock/Unlock/Panic/Manual Resynch/Fob Program/Diag Acknowledge/Diag Request

Unlock

Park Brake Switch

Input 1

SET/RELEASED

RELEASED (park brake not set)

Passenger Door Unlock Input

Input 1

ACTIVE/INACTIVE

INACTIVE

Remote Function Actuation Message Since Wake-Up

Input 1

NONE/PANIC/Active Unlock Fob# /Active Lock/Prog Mode Cancel/Prog Successful/Prog Mode Ack/Manual Resync

Actv Unlock Fob#

Retained Accessory Power Relay Feedback

Input 1

ON/OFF

ON

Seatbelt Buckled

Input 1

YES/NO

YES (driver seatbelt buckled)

Auto Headlamps

Input 2

ACTIVE/INACTIVE

INACTIVE (in LIGHT state)

Cargo Lamp Switch

Input 2

ON/OFF

OFF

Courtesy Lamp Relay

Input 2

ON/OFF

OFF

Dimming Potentiometer Input

Input 2

ACTIVE/INACTIVE

ACTIVE

Dome Lamp Switch

Input 2

ON/OFF

OFF

Dome Override Switch

Input 2

ON/OFF

OFF

Flash to Pass Switch

Input 2

ON/OFF

OFF

Front Fog Lamp Switch

Input 2

ON/OFF

OFF

Headlamp Relay Feedback

Input 2

ON/OFF

OFF (in LIGHT state)

High Beam Switch

Input 2

ON/OFF

OFF

Left Turn Signal

Input 2

ON/OFF

OFF

Park Lamps

Input 2

ON/OFF

ON

Right Turn Signal

Input 2

ON/OFF

OFF

Transmission Preference

Input 2

ON/OFF

OFF

Chime

Outputs

None/Headlamp/Turn Signal/Key In Ignition/Seatbelt/Park Brake

None

Courtesy Lamp Relay

Outputs

ON/OFF

OFF

Daytime Running Lamps Relay

Outputs

ON/OFF

ON (in LIGHT state)

Dimming

Outputs

ACTIVE/INACTIVE

INACTIVE (park lamps OFF)

Door Lock Relay

Outputs

ON/OFF

OFF

Driver Door Unlock Relay

Outputs

ON/OFF

OFF

Front Fog Lamp Relay

Outputs

ON/OFF

OFF

Headlamp Power Relay

Outputs

ON/OFF

OFF (in LIGHT state)

Horn Relay

Outputs

ON/OFF

OFF

Inadvertent Power Relay

Outputs

ON/OFF

ON

Interior Lighting Mode

Outputs

None/Interior/Illuminated Entry/Exit Lighting/Remote Illuminated

Interior

Lift Glass Relay

Outputs

ON/OFF

OFF

Park Lamp Relay

Outputs

ON/OFF

OFF (in LIGHT state)

Passenger Door Unlock Relay

Outputs

ON/OFF

OFF

Rear Fog Lamp Relay

Outputs

ON/OFF

OFF

Retained Accessory Power Relay

Outputs

ON/OFF

ON

Auto Learn Timer

Security Data

Seconds

0-600

Battery Voltage

Security Data

Volts

Varies

Content Theft Lamp

Security Data

ON/OFF

OFF

Content Theft State

Security Data

ON/OFF

OFF

Door Key Switch

Security Data

ACTIVE/INACTIVE

ACTIVE

Ignition 1

Security Data

ACTIVE/INACTIVE

ACTIVE

Ignition 3

Security Data

ACTIVE/INACTIVE

ACTIVE

Passlock™ Code

Security Data

Open/Short/Tamper/Numeric

Valid Code 1-10

Passlock™ Data Voltage

Security Data

Volts

0.86-4.28 Volts

Passlock™ State

Security Data

Ignition Off/Tamper/Fail Enable/Fail Enable Dec/Seedkey Lrn Pend/Seedkey Learn/Auto Learn Pend/Learn Passlock™/Monitor Passlock™/Normal Decision/Auto Learn

Monitor Passlock™

Security Lamp State

Security Data

ON/OFF/FLASHING

OFF

Tamper Timer

Security Data

Seconds

0-600

VCM/PCM Fail Enable

Security Data

YES/NO

NO

VCM/PCM Fuel Continue

Security Data

YES/NO

YES

VCM/PCM Learn Timer

Security Data

ACTIVE/INACTIVE

INACTIVE

VTD Fuel Disable

Security Data

ACTIVE/INACTIVE

INACTIVE

VTD Fuel Disable Until Ignition Off

Security Data

YES/NO

NO

VTD Password Learn Mode

Security Data

ACTIVE/INACTIVE

INACTIVE