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

Steering Wheel Controls - 3 Spoke
Object Number: 1912514 Size: FS
Master Electrical Component List
Cruise Control Description and Operation
Control Module References
Steering Wheel Controls - 4 Spoke
Figure 2:

Steering Wheel Controls - 4 Spoke
Object Number: 1912516 Size: FS
Master Electrical Component List
Cruise Control Description and Operation
Control Module References
Steering Wheel Controls - 3 Spoke
Figure 3:

Brake Pedal Position Sensor, and Stop Lamp Switch Signal
Object Number: 1912519 Size: FS
Master Electrical Component List
Cruise Control Description and Operation
Control Module References