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 Light/Sunload Sensor
B+ Bus - Underhood Fuse Block
Figure 2:

Headlamp Switch


Object Number: 888358  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Headlamps
G102, G104, G105 and G107
G201 - 1 of 2
Interior Lamps (Short Wheelbase, Body Type VIN 3)
Foglamps
Headlamp Washer
Courtesy Lamp Supply