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

Door Locks


Object Number: 2151382  Size: FS
Master Electrical Component List
Power Door Locks Description and Operation
Control Module References
Door Ajar Switches
B+ Bus 2 of 2
Fuse Block - Underhood F28, F10, F22, F2, F1, and F36 Fuses
Power, Ground , Class 2, and GM Low Speed Serial Data (CAN A)
Power, Ground , Class 2, and GM Low Speed Serial Data (CAN A)
G203, G204, and G205
G401
G203, G204, and G205
Figure 2:

Door Ajar Switches


Object Number: 2151385  Size: FS
Master Electrical Component List
Power Door Locks Description and Operation
Control Module References
Door Locks
G201 and G202
G302 and G303
G401