GM Service Manual Online
For 1990-2009 cars only
Table 1: Body Control Module
Table 2: Liftgate Module
Table 3: Endgate Module
Table 4: IPC

Body Control Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF/No Switches ON

Front Wipers Active

Inputs

Yes/No

No

Headlamp Wash

Inputs

On/Off

Off

Headlamp Wash

Outputs

On/Off

Off

Rear Washer Requested

Outputs

Yes/No

No

Liftgate Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF/No Switches ON

Rear Washer Requested

Data

Yes/No

No

Rear Wiper Mode

Data

Off/Delay 1/Delay 2/On/Wash

Off

Requested Rear Wiper

Data

Off/Delay 1/Delay 2/On/Wash

Off

Liftgate Ajar Switch

Data

Closed/Ajar

Closed

Liftglass Ajar Switch

Data

Closed/Ajar

Closed

Endgate Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF/No Switches ON

Rear Wiper

Input/Output

Park/Active

Park

Requested Rear Wiper

Input/Output

Off/Delay 1/Delay 2/On/Wash

Off

Rear Wiper Relay Cmd.

Input/Output

Off/Delay 1/Delay 2/On/Wash

Off

Lower Left Ajar Switch

Input/Output

Closed/Ajar

Closed

Upper Left Ajar Switch

Input/Output

Closed/Ajar

Closed

Upper Right Ajar Switch

Input/Output

Closed/Ajar

Closed

Upper Left Dome Lamp Switch

Input/Output

Closed/Ajar

Closed

IPC

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF/No Switches ON

Low Washer Fluid

Inputs/Output

OK/Low

OK