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

Headlamp and Headlamp Dimmer Switch Control


Object Number: 1458649  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Headlamp Relay Control
Data Link Connector Schematics
Indicator and DIC Controls
G103, G104
G200
Figure 2:

Headlamp Relay Control


Object Number: 1458650  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Daytime Running Lamp (DRL) Relay Control
Headlamp and Headlamp Dimmer Switch Control
B+ Bus Underhood Fuse Block
G101
Daytime Running Lamp (DRL) Relay Control
G101
G100, G102
G105
Figure 3:

Day Time Running Lamp (DRL) Relay Control


Object Number: 1458655  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Headlamp Relay Control
B+ Bus - Rear Fuse Block
Headlamp Relay Control
G100, G102
G105