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

Steering Wheel Controls (N31)


Object Number: 1875056  Size: FS
Master Electrical Component List
Steering Wheel Controls Description and Operation
Control Module References
Steering Wheel Controls (without N31)
Figure 2:

Steering Wheel Controls (without N31)


Object Number: 1907864  Size: FS