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

Headlamp Switch and Ambient Light Sensor


Object Number: 559752  Size: FS
Lighting Systems Components
Headlights Circuit Description
Headlamp Dimmer, Park Gear Input, and High Beam Indicator
Underhood Fuse Block, RUN/CRANK Fuse and IGN-1 Relay
Underhood Fuse Block and Underhood Maxi-Fuse Block
Underhood Fuse Block, PCM, ABS, HAZARD, FUEL PUMP, PARKLMP Fuses And Fuel Pump Relay
Underhood Fuse Block, OXYGEN SENSOR and IGN-1 Fuses
Underhood Fuse Block, PCM, ABS, HAZARD, FUEL PUMP, PARKLMP Fuses And Fuel Pump Relay
Handling ESD Sensitive Parts Notice
G202, 4 of 4
G202, 2 of 4
G202, 1 of 4
G202, 1 of 4
Figure 2:

Headlamp Dimmer, Park Gear Input, and High Beam Indicator


Object Number: 559756  Size: FS
Lighting Systems Components
Headlights Circuit Description
Low Beam Headlamps
Headlamp Switch and Ambient Light Sensor
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
G202, 4 of 4
G202, 1 of 4
Figure 3:

Low Beam Headlamps


Object Number: 559758  Size: FS
Lighting Systems Components
Headlights Circuit Description
High Beam Headlamps and Daytime Running Lamps (DRL)
Headlamp Dimmer, Park Gear Input, and High Beam Indicator
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
G104 and G106
G105
Handling ESD Sensitive Parts Notice
Figure 4:

High Beam Headlamps and Daytime Running Lamps (DRL)


Object Number: 559763  Size: FS
Lighting Systems Components
Headlights Circuit Description
Low Beam Headlamps
Handling ESD Sensitive Parts Notice
G104 and G106
G105