GM Service Manual Online
For 1990-2009 cars only

Body Control Module (BCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF/Vehicle in PARK/Headlamps in AUTO/All doors closed

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

Ambient Light

Data

Dark/Light

Varies

Ambient Light Sensor

Data

Volts

Varies

Battery Voltage

Data

Volts

Varies

Courtesy Lamp Timer

Data

Seconds

0 Seconds

Dimming Potentiometer

Data

Volts

Varies

High Beam Input

Data

Volts

Approximately 12 Volts

Inadvertent Power Timer

Data

Seconds

Approximately 1200 Seconds

Door Handle Switch

Input 1

Active/Inactive

Inactive

Driver Door Jamb Switch

Input 1

Active/Inactive

Inactive

Ignition 1

Input 1

Active/Inactive

Active

Ignition 3

Input 1

Active/Inactive

Active/Inactive

Ignition Power Mode

Input 1

Off/Run/Crank/ Unknown

Run

Key in Ignition

Input 1

Yes/No

Yes

Last Remote Function Actuation Cmd. Since Wake-Up

Input 1

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

Varies

Lift Glass Switch

Input 1

On/Off

Off

Park Brake Switch

Input 1

Set/Released

Released

Rear Gate/Door

Input 1

Open/Closed

Closed

Rear Pass Door/Lift Glass

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

Varies

Auto Headlamps

Input 2

Active/Inactive

Varies

Courtesy Lamp Relay

Input 2

On/Off

Off

Dim Pot Input

Input 2

Active/Inactive

Inactive

Dome Lamp Switch

Input 2

On/Off

Off

Dome Override Switch

Input 2

On/Off

Varies

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

Varies

Headlamp Request Switch

Input 2

Active/Inactive

Inactive

High Beam Switch

Input 2

On/Off

Off

Interior Lamp Request

Input 2

Active/Inactive

Inactive

Left Turn Signal

Input 2

On/Off

Off

Park Lamps

Input 2

On/Off

Varies

Rear Fog Lamp Switch

Input 2

On/Off

Off

Right Turn Signal

Input 2

On/Off

Off

Courtesy Lamp Relay

Outputs

On/Off

Off

Dimming

Outputs

Active/Inactive

Inactive

Front Fog Lamp Relay

Outputs

On/Off

Off

Headlamp Power Relay

Outputs

On/Off

Varies

Inadvertent Power Relay

Outputs

On/Off

On

Interior Lighting Mode

Outputs

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

None

Park Lamp Relay

Outputs

On/Off

Varies

Rear Fog Lamp Relay

Outputs

On/Off

Off