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

Steering Wheel Controls (w/ RDS)


Object Number: 1509010  Size: FS
Master Electrical Component List
Steering Wheel Controls (w/o RDS)
Figure 2:

Steering Wheel Controls (w/o RDS)


Object Number: 1478512  Size: FS
Master Electrical Component List
Steering Wheel Controls (w/ RDS)