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

Body Control Module Power and Grounds


Object Number: 895985  Size: FS
Figure 2:

Body Control Module Door and Window Controls


Object Number: 743539  Size: FS
Figure 3:

Body Control Module Lighting Controls


Object Number: 743542  Size: FS
Figure 4:

Body Control Module Serial Data, Lighting and HVAC


Object Number: 895988  Size: FS