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

Headlamps and Headlamp Switch


Object Number: 527599  Size: FS
Lighting Systems Components
Headlights Circuit Description
DRL Relay, ALC Headlamp Relay, DRL Resistor and Body Control Module
Power Distribution Schematics
DRL Relay, ALC Headlamp Relay, DRL Resistor and Body Control Module
Ground Distribution Schematics
DRL Relay, ALC Headlamp Relay, DRL Resistor and Body Control Module
Figure 2:

DRL Relay, ALC Headlamp Relay, DRL Resistor and Body Control Module


Object Number: 527601  Size: FS
Lighting Systems Components
Headlights/Daytime Running Lights (DRL) Circuit Description
Headlamps and Headlamp Switch
Power Distribution Schematics
Power Distribution Schematics
HVAC Blower Control Schematics
Ground Distribution Schematics
Ground Distribution Schematics
Headlamps and Headlamp Switch
Headlamps and Headlamp Switch