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

Daytime Running Lamps (DRL) Control Module Power and Ground, Ambient Light Sensor


Object Number: 1426461  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Turn Signal/Headlamp Switch
Power, AM 1, Door, Tail, P/Point, ECU-B, Stop, OBD, INV, Fuses
Power, AM 1, Door, Tail, P/Point, ECU-B, Stop, OBD, INV, Fuses
S103 and G103
SP201 and G201
Junction Block - Instrument Panel Right
Charge, Air Bag, Malfunction, O/D OFF, Cruise Indicators
Figure 2:

Turn Signal/Headlamp Switch


Object Number: 1426490  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Headlamps
Daytime Running Lamp (DRL) Control Module Power and Ground
Multifunction Alarm Module, Horn, Hazard, Turn Signal/Headlamp Switch
Junction Block - Instrument Panel Left
SP201 and G201
Figure 3:

Headlamps


Object Number: 1426499  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Turn Signal/Headlamp Switch
Air Pump, ETCS, Head, Alt S, EFI, EFI 2, Hazard Fuses
S103 and G103