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

Headlamps


Object Number: 675947  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Headlamp Switch
G101, G103, G106, and G110
G102, G104, G105, and G107
G108
Ambient Lignt/Sunload Sensor
I/P BATT, TRAILER ABS, HORN IGN A, IGN B, ATC Fuses
Figure 2:

Headlamp Switch


Object Number: 896643  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Headlamps
G102, G104, G105, and G107
G201, 1 of 2
Fog Lights
Dimming Supply Voltage
I/P Backlighting