GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Body Control Module and Switch Inputs


Object Number: 507966  Size: FS
Data Link Communications Components
Interior Lights Circuit Description
Body Control Module and Courtesy Lamps
Handling ESD Sensitive Parts Notice
G200 Splice S220
G400 Splice S470
Figure 2:

Body Control Module and Courtesy Lamps


Object Number: 507968  Size: FS
Data Link Communications Components
Interior Lights Circuit Description
Body Control Module and Switch Inputs
Handling ESD Sensitive Parts Notice
G200 Splice S220