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

Power, Ground, and Class 2
Object Number: 1892567 Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
High Speed GMLAN - Automatic Transmission
Figure 2:

High Speed GMLAN - Automatic Transmission
Object Number: 1892569 Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
High Speed GMLAN - Manual Transmission
Power, Ground, and Class 2
Figure 3:

High Speed GMLAN - Manual Transmission
Object Number: 1892571 Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
High Speed GMLAN - Automatic Transmission