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

Power, Ground , Class 2, and GM Low Speed Serial Data (CAN A)


Object Number: 2033901  Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
GM Mid Speed Serial Data (CAN B)
Fuse Block - Rear F29, F34, F22, F4, F24, F3, F23, and F1 Fuses
G305
Figure 2:

GM Mid Speed Serial Data (CAN B)


Object Number: 2033902  Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
GM High Speed Serial Data (CAN C)
Power, Ground, Class 2, and GM Low Speed Serial Data (CAN A)
Figure 3:

GM High Speed Serial Data (CAN C)


Object Number: 2033903  Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
GM Mid Speed Serial Data (CAN B)