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

Headlights Controls


Object Number: 1883335  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Headlights/DRL Schematics
Figure 2:

Headlights/DRL


Object Number: 1883334  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Headlight Controls