GM Service Manual Online
For 1990-2009 cars only
Table 1: Body Control Module (BCM)
Table 2: Driver Door Switch (DDS)
Table 3: Liftgate Module (LGM)
Table 4: Liftgate Module (LGM) Open/Close History Data
Table 5: Passenger Door Switch (PDS)

Body Control Module (BCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF/All Doors Closed

Ext. Trunk/Liftglass Rel. Sw.

Body Rear End

Active/Inactive

Inactive

Int. Trunk/Liftglass Sw.

Body Rear End

Active/Inactive

Inactive

Liftgate Lock Status

Body Rear End

Locked/Unlocked

Unlocked

Door Lock Requestor

Doors

Power Lock/Door Key Cyl./Rear Closure/Emergency/Keyless Entry/Passive Keyless/Remote/Delayed Lock/Relocking/Anti-Lockout/Exterior Switch/Auto Locks/

Varies

Drvr. Door Unlock Cmd.

Doors

Off/On

Off

Left Rear Door Ajar Sw.

Doors

Door Ajar/Door Closed

Door Closed

Passenger Door Open Sw.

Doors

Open/Closed

Closed

Rear Doors Lock Cmd.

Doors

Off/On

Off

Rear Doors Unlock Cmd.

Doors

Off/On

Off

Right Rear Door Ajar Sw.

Doors

Door Ajar/Door Closed

Door Closed

Driver Door Switch (DDS)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF/All Doors Closed

Battery Voltage Signal

Data

Voltage

Varies

Door Key Cyl. Unlock Switch

Inputs

Idle/Unlock

Idle

Driver Door Ajar Sw.

Inputs

Active/Inactive

Inactive

Driver Door Open Sw.

Inputs

Active/Inactive

Inactive

Door Lock Actuator Cmd.

Outputs

Off/Lock/Unlock

Off

Liftgate Module (LGM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF/Liftgate Closed

Battery Voltage Signal 2

Data

Voltage

Varies

Hall Sensor Feed Status

Data

No Output/Short to Ground

No Output

Liftgate Handle Switch Status

Data

Active/Inactive

Inactive

Liftgate Ajar Switch

Data

Active/Inactive

Inactive

Object Detection Sensor Status

Data

Voltage

3.33 V

Object Sensor Supply Voltage

Data

Active/Inactive

Active

LGM Clutch Actuator Command

Data

Active/Inactive

Inactive

LGM Latch Motor Cinch Command

Data

Active/Inactive

Inactive

LGM Latch Pawl Switch

Data

Active/Inactive

Inactive

LGM Latch Ratchet Switch

Data

Active/Inactive

Inactive

LGM Latch Motor Release Command

Data

Active/Inactive

Inactive

LGM Latch Sector Switch

Data

Active/Inactive

Inactive

LGM Motor Closed Command

Data

Active/Inactive

Inactive

LGM Motor Open Command

Data

Active/Inactive

Inactive

LGM Open/Close Position Learned

Data

Yes/No

Yes

LGM Full Open Switch

Data

Active/Inactive

Inactive

Liftgate Module (LGM) Open/Close History Data

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF/Liftgate Closed

Crank Signal Present

Open/Close History Data

Yes/No

No

Door Lock Status

Open/Close History Data

Locked/Unlocked

Unlocked

Hall Sensor Feed Status

Open/Close History Data

No Output/Short to Ground

No Output

LGM Latch Fault

Open/Close History Data

Yes/No

No

LGM Position Out of Range

Open/Close History Data

Yes/No

No

Liftgate Handle Sw. Status

Open/Close History Data

Active/Inactive

Inactive

Module Over Current Detected

Open/Close History Data

Yes/No

No

Object Detection Sensor Status

Open/Close History Data

Yes/No

No

Obstacle Detected in Liftgate

Open/Close History Data

Yes/No

No

System Operation Status

Open/Close History Data

OK/Not OK

OK

System Voltage

Open/Close History Data

OK/Out of Range

OK

Temperature Out of Range

Open/Close History Data

Yes/No

No

Vehicle In Park

Open/Close History Data

Yes/No

Yes

Passenger Door Switch (PDS)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF/ALL Doors Closed

Battery Voltage Signal

Data

Voltage

Varies

Passenger Door Ajar Sw.

Inputs

Active/Inactive

Inactive

Passenger Door Open Sw.

Inputs

Active/Inactive

Inactive

Door Lock Actuator Cmd.

Outputs

Off/Lock/Unlock

Off