GM Service Manual Online
For 1990-2009 cars only

Body Control Module (BCM)

Scan Tool Parameter

Additional Menu Selection(s)

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON, Engine OFF, Doors, Trunk and Hood Closed, No Switches ON, Vehicle in PARK or NEUTRAL.

ALC Headlamp Status

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Varies with light level

ALC Parklamp Status

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Varies with light level

ALC Status

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Varies with light level

Ambient Light Sensor

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Volts

Varies

Backup Lamp Relay Cmd.

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

BPP Sensor

Body and Accessories/Lighting Systems/Data Display/Chassis Data

Volts

Varies

BPPS Learn Home Position

Body and Accessories/Lighting Systems/Data Display/Chassis Data

Counts

Varies

BPPS Ratio

Body and Accessories/Lighting Systems/Data Display/Chassis Data

Counts

Varies

BPPS Status

Body and Accessories/Lighting Systems/Data Display/Chassis Data

Learned/Unlearned

Learned

Day/Night Status

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Day/Night

Varies with light level

DRL Status

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Inactive/Active

Active

Flash to Pass Switch

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Inactive/Active

Inactive

Front Fog Lamp Relay Command

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

Front Fog Lamp Switch

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Inactive/Active

Inactive

Hazard Lamp Switch

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

Headlamp OFF Switch

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

Headlamp ON Switch

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

High Beam Relay Command

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

High Beam Select Switch

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Inactive/Active

Inactive

IP Dimmer Switch

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Volts

Varies

Inadvertent Power Cmd.

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

Inadvertent Power Signal

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Inactive/Active

Inactive

Interior Light Command

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

Interior Lights Dimmed Command

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

Left Turn Signal Switch

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Inactive/Active

Inactive

LF Turn/Hazard Lamp Command

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

LF Turn Lamp/DRL Status

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

Low Beam Relay Command

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

LR Turn/Hazard Lamp Command

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

LR Turn/Stop Lamp Status

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

Park Brake Switch

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Inactive/Active

Active

Park Lamp Relay Cmd.

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

Park Lamp Switch

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

Right Turn Signal Switch

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Inactive/Active

Inactive

RF Turn/Hazard Lamp Command

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

RF Turn Lamp/DRL Status

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

RR Turn/Hazard Lamp Command

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

RR Turn/Stop Lamp Status

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off

Stop Lamp Relay Command

Body and Accessories/Lighting Systems/Data Display/Lighting Data

Off/On

Off