GM Service Manual Online
For 1990-2009 cars only
Table 1: Body Control Module (BCM)
Table 2: Driver Door Module (DDM)
Table 3: HVAC
Table 4: Instrument Panel Cluster (IPC)
Table 5: Passenger Door Module (PDM)

Body Control Module (BCM)

Scan Tool Parameter

Data List

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 Switch

Data/Lighting Data

Off/On

Varies with light level

Backup Lamp Relay Cmd.

Data/Lighting Data

Off/On

Off

Battery Voltage Signal

Data/Lighting Data

Volts

9-16 Volts

BPP Sensor

Data/Chassis Data

Volts

Varies

BPPS Learn Home Position

Data/Chassis Data

Counts

Varies

BPPS High During Learn

Data/Chassis Data

No/Yes

No

BPPS Low During Learn

Data/Chassis Data

No/Yes

No

BPPS Move During Learn

Data/Chassis Data

No/Yes

No

BPP Sensor Reference

Data/Chassis Data

Volts

5 volts

BPPS Status

Data/Chassis Data

Learned/Unlearned

Learned

Day/Night Status

Data/Lighting Data

Off/Night/Day/Delay Off

Varies with light level

DRL Status

Data/Lighting Data

Off/On

Varies with light level

Flash to Pass Switch

Data/Lighting Data

Inactive/Active

Inactive

Fog Lamp Relay Cmd.

Data/Lighting Data

Off/On

Off

Front Fog Lamp Switch

Data/Lighting Data

Inactive/Active

Inactive

Hazard Lamp Switch

Data/Lighting Data

Inactive/Active

Inactive

Headlamp OFF Switch

Data/Lighting Data

Off/On

On

Headlamp ON Switch

Data/Lighting Data

Inactive/Active

Inactive

High Beam Relay Command

Data/Lighting Data

Off/On

Off

High Beam Select Switch

Data/Lighting Data

Inactive/Active

Inactive

Ign. Mode Sw. Dimming Command

Data/Lighting Data

Off/On

Off

Inadvertent Power Cmd.

Data/Lighting Data

Off/On

Off

Inadvertent Power Signal

Data/Lighting Data

Inactive/Active

Inactive

Learn in Progress

Data/Chassis Data

No/Yes

No

Left Turn Signal Switch

Data/Lighting Data

Inactive/Active

Inactive

LF Turn/Hazard Lamp Command

Data/Lighting Data

Off/On

Off

LF Turn Lamp/DRL Status

Data/Lighting Data

Off/On

Off

Low Beam Relay Command

Data/Lighting Data

Off/On

Off

LR Turn/Hazard Lamp Command

Data/Lighting Data

Off/On

Off

LR Turn Lamp/DRL Status

Data/Lighting Data

Off/On

Off

Park Lamp Relay Cmd.

Data/Lighting Data

Off/On

Off

Park Lamp Switch

Data/Lighting Data

Off/On

Off

Rear Fog Lamp Relay Cmd.

Data/Lighting Data

Off/On

Off

Rear Fog Lamp Switch

Data/Lighting Data

Inactive/Active

Inactive

RF Turn/Hazard Lamp Command

Data/Lighting Data

Off/On

Off

RF Turn Lamp/DRL Status

Data/Lighting Data

Off/On

Off

Right Turn Signal Switch

Data/Lighting Data

Inactive/Active

Inactive

RR Turn/Hazard Lamp Command

Data/Lighting Data

Off/On

Off

RR Turn Lamp/DRL Status

Data/Lighting Data

Off/On

Off

Stop Lamp Relay Command

Data/Lighting Data

Off/On

Off

Stop Lamp Status

Data/Chassis Data

Off/On

Off

Theater Dimming Command

Data/Lighting Data

Off/On

Off

Driver Door Module (DDM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

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

Door Switch Backlight Command

Data

0%-100%

Varies

Lock Switch Indicator Command

Data

Off/On

Off

HVAC

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

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

Left Sunload Sensor

Sensor Data

Counts

Varies

Right Sunload Sensor

Sensor Data

Counts

Varies

Ambient Light Sensor

Sensor Data

Counts

Varies

Instrument Panel Cluster (IPC)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

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

Dim Down Switch

Inputs/Outputs

Inactive/Active

Inactive

Dim Up Switch

Inputs/Outputs

Inactive/Active

Inactive

Dome Lamp Switch

Inputs/Outputs

Off/On

Off

Front Fog Indicator Command

Inputs/Outputs

Off/On

Off

Headlamps On Indicator

Inputs/Outputs

Off/On

Off

High Beam Indicator Command

Inputs/Outputs

Off/On

Off

Left Turn Signal

Inputs/Outputs

Off/On

Off

Park Lamps Signal

Inputs/Outputs

Off/On

Off

Rear Fog Indicator Command

Inputs/Outputs

Off/On

Off

Right Turn Signal

Inputs/Outputs

Off/On

Off

Passenger Door Module (PDM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

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

Door Switch Backlight Command

Data

0%-100%

Varies

Lock Switch Indicator Command

Data

Off/On

Off