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
B+ Bus
BATT and LIGHTING Fuse Bus, and ATC, FRT HVAC, and RR-HTR/A/C Fuses
B+ Bus
CTSY, PK LPS, PWR ADJ MIRR, and TBC Fuses
Sealed Beam Headlamps, Composite Headlamps
G100, G106, and G302
G110 - Page 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
B+ Bus
Ignition Switch - START, RUN/START, and OFF/RUN/START Bus Bars
CTSY, PK LPS, PWR ADJ MIRR, and TBC Fuses
AIR BAG, GAGES, and TURN-B/U Fuses
Sealed Beam Headlamps, Composite Headlamps
Sealed Beam Headlamps, Composite Headlamps
G110 - Page 1 of 2