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

Module Power, Ground and Serial Data


Object Number: 1915182  Size: FS
Master Electrical Component List
SIR System Description and Operation
Control Module References
Communication Signals and Controls
Figure 2:

Communication Signals and Controls


Object Number: 1915185  Size: FS
Master Electrical Component List
SIR System Description and Operation
Control Module References
Module Power, Ground and Serial Data