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: 2151205  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: 2151206  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: 2151207  Size: FS
Master Electrical Component List
Data Link Communications Description and Operation
Control Module References
GM Mid Speed Serial Data (CAN B)