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 Underhood Fuse Block
G101, G106 and G302
G110 (1 of 2)
BATT and LIGHTING Fuse
Sealed Beam Headlamps, Composite Headlamps
BATT and LIGHTING Fuse
CTSY Fuse 3, PK LPS Fuse 9, TBC Fuse 15, and PWR MIR Fuse 21
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 D300
Headlamp and Panel Dimmer Switch, Ambient Light Sensor
Headlamp and Panel Dimmer Switch, Ambient Light Sensor
DRL Relay and Diode D300
DRL Relay and Diode D300
Figure 3:

DRL Relay and Diode D300


Object Number: 634873  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Sealed Beam Headlamps, Composite Headlamps
Sealed Beam Headlamps, Composite Headlamps
BATT and LIGHTING Fuse
CTSY Fuse 3, PK LPS Fuse 9, TBC Fuse 15, and PWR MIR Fuse 21
ING-A Fuse and Ignition Switch
G110 (1 of 2)
Sealed Beam Headlamps, Composite Headlamps
GAUGES Fuse 4, AIR BAG Fuse 10, and TURN-B/U Fuse 16