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

Headlamp and Panel Dimmer Switch, Ambient Light Sensor


Object Number: 634871  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Sealed Beam Headlamps, Composite Headlamps
Battery and Fuse Block - Underhood
Battery and Lighting Fuse
Battery and Lighting Fuse
Courtesy, Park Lamps, TBC, and Power Mirror Fuses
Sealed Beam Headlamps, Composite Headlamps
G100, G106, and G302
G110 (1 of 2)
Figure 2:

Sealed Beam Headlamps, Composite Headlamps


Object Number: 634872  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
DRL Relay and Diode
Headlamp and Panel Dimmer Switch, Ambient Light Sensor
Headlamp and Panel Dimmer Switch, Ambient Light Sensor
DRL Relay and Diode
DRL Relay and Diode
Figure 3:

DRL Relay and Diode


Object Number: 634873  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Sealed Beam Headlamps, Composite Headlamps
Battery and Lighting Fuse
IGN RUN and START Bus Bar
Courtesy, Park Lamps, TBC, and Power Mirror Fuses
Gages, Air Bag, Turn, Back-up Fuses
Sealed Beam Headlamps, Composite Headlamps
Sealed Beam Headlamps, Composite Headlamps
G110 (1 of 2)