GM Service Manual Online
For 1990-2009 cars only
Table 1: Body Control Module (BCM)
Table 2: Driver Door Module (DDM)
Table 3: Headlamp Control Module
Table 4: HVAC
Table 5: Instrument Panel Cluster (IPC)
Table 6: 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

Exterior Lighting

Off/On

Varies with light level

Backup Lamp Relay Cmd.

Exterior Lighting

Off/On

Off

BPP Sensor

Exterior Lighting

Volts

Varies

BPPS Learned Home Position

Exterior Lighting

Counts

Varies

BPPS High During Learn

Exterior Lighting

No/Yes

No

BPPS Low During Learn

Exterior Lighting

No/Yes

No

BPPS Move During Learn

Exterior Lighting

No/Yes

No

BPP Sensor Reference

Exterior Lighting

Volts

5 volts

BPPS Status

Exterior Lighting

Learned/Unlearned

Learned

Day/Night Status

Exterior Lighting

Off/On

Varies with light level

DRL Status

Exterior Lighting

Off/On

Varies with light level

Flash to Pass Switch

Exterior Lighting

Inactive/Active

Inactive

Fog Lamp Relay Cmd.

Exterior Lighting

Off/On

Off

Front Fog Lamp Switch

Exterior Lighting

Inactive/Active

Inactive

Hazard Lamp Switch

Exterior Lighting

Inactive/Active

Inactive

Headlamp OFF Switch

Exterior Lighting

Off/On

On

Headlamp ON Switch

Exterior Lighting

Inactive/Active

Inactive

High Beam Relay Command

Exterior Lighting

Off/On

Off

High Beam Select Switch

Exterior Lighting

Inactive/Active

Inactive

Ign. Mode Sw. Dimming Command

Interior Lighting

Off/On

Off

Inadvertent Power Cmd.

Interior Lighting

Off/On

Off

Inadvertent Power Signal

Interior Lighting

Inactive/Active

Inactive

Learn in Progress

Exterior Lighting

No/Yes

No

Left Turn Signal Switch

Exterior Lighting

Inactive/Active

Inactive

LF Turn/Hazard Lamp Command

Exterior Lighting

Off/On

Off

LF Turn Lamp/DRL Status

Exterior Lighting

Off/On

Off

Low Beam Relay Command

Exterior Lighting

Off/On

Off

LR Turn/Hazard Lamp Command

Exterior Lighting

Off/On

Off

LR Turn Lamp/DRL Status

Exterior Lighting

Off/On

Off

Park Lamp Relay Cmd.

Exterior Lighting

Off/On

Off

Park Lamp Switch

Exterior Lighting

Off/On

Off

Rear Fog Lamp Relay Cmd.

Exterior Lighting

Off/On

Off

Rear Fog Lamp Switch

Exterior Lighting

Inactive/Active

Inactive

RF Turn/Hazard Lamp Command

Exterior Lighting

Off/On

Off

RF Turn Lamp/DRL Status

Exterior Lighting

Off/On

Off

Right Turn Signal Switch

Exterior Lighting

Inactive/Active

Inactive

RR Turn/Hazard Lamp Command

Exterior Lighting

Off/On

Off

RR Turn Lamp/DRL Status

Exterior Lighting

Off/On

Off

Stop Lamp Relay Command

Exterior Lighting

Off/On

Off

Stop Lamp Status

Exterior Lighting

Off/On

Off

Theater Dimming Command

Interior Lighting

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

Exterior Courtesy Lamp Status

Data

Off/On

Off

Lock Switch Indicator Command

Data

Off/On

Off

Headlamp Control Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON, with the engine OFF transmission shift lever in the PARK position all lighting turned OFF all doors closed

AFS Disable Indication

Data/Inputs

Off/On

Off

Auto Headlamp Status

Data/Inputs

Off/On

On

Auto Hdlp. Signal Present

Data/Inputs

Yes/No

Yes

Base Model Part Number

Module ID Information

Number

Varies

Component Serial No. 13-16

Module ID Information

Number

13-16th Digit

End Model Part Number

Module ID Information

Number

Varies

Headlamp Control Motor Status

Data/Inputs

Off/Active/Hold/ Homing/Forward/Disabled/Invalid

Active

Ignition 1

Data/Inputs

Active/Inactive

Active

Julian Date Of Build

Module ID Information

Number

Varies

Left Hdlp. Motor Position

Data/Outputs

Counts

Varies

Right Hdlp. Motor Position

Data/Outputs

Counts

Varies

Software Part Number

Module ID Information

Number

Varies

Year Model Built

Module ID Information

Number

Varies

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

Ambient Light Sensor

Sensor Data

Counts

Varies

Left Sunload Sensor

Sensor Data

Counts

Varies

Right Sunload 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

Data

Inactive/Active

Inactive

Dim Up Switch

Data

Inactive/Active

Inactive

Dome Lamp Switch

Data

Off/On

Off

Front Fog Indicator Command

Data

Off/On

Off

High Beam Indicator Command

Data

Off/On

Off

Left Turn Signal

Data

Off/On

Off

Park Lamps Signal

Data

Off/On

Off

Rear Fog Indicator Command

Data

Off/On

Off

Right Turn Signal

Data

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

Exterior Courtesy Lamp Status

Data

Off/On

Off

Lock Switch Indicator Command

Data

Off/On

Off