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

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, 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