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

Ambient Light Sensor, Brake Pedal Position Sensor, Hazard Switch and Turn Signal/Multifunction Switch


Object Number: 1638115  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Turn Signals and Stop Lamps
Low Speed Serial Data
Power, Ground, Class 2 and High Speed Serial Data
Mode and Air Temperature Controls
Headlights/Daytime Running Lights (DRL) Schematics
G201
G203
Figure 2:

Turn Signals and Stop Lamps


Object Number: 1638121  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Park Lamps
Ambient Light Sensor, Brake Pedal Position Sensor, Hazard Switch and Turn Signal/Multifunction Switch
Electronic Throttle Controls
G101 and G102
G401 and G403
G302
G101 and G102
G101 and G102
G401 and G403
G401 and G403
G302
G109
Figure 3:

Park Lamps


Object Number: 1638122  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
License Lamps and Backup Lamps
Turn Signals and Stop Lamps
Underhood Fuse Block, RBEC 2, RUN RLY, Body Control Module (BCM) HVAC BLOWER HIGH Relay, RUN Relay, HVAC BLOWER, HVAC CTRL (IGN), Rear Fuse Block, FUEL/PMP Relay, PARK LP Relay, TRUNK Relay, DRV ST
License Lamps and Backup Lamps
G101 and G102
G101 and G102
G401 and G403
G401 and G403
Figure 4:

License Lamps and Backup Lamps


Object Number: 1638131  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Park Lamps
Underhood Fuse Block - RBEC 1 Fuse, Rear Fuse Block, AUX PWR #2, BCK/UP LAMPS, CIG/AUX, HTD MIR, HTD SEAT, RKE/XM/DVD/UGD, RR DEFOG and S/ROOF Fuses
Park Lamps
Garage Door Opener Schematics
Inside Rearview Mirror Schematics
OnStar Schematics
G302
G304 and G305
G401 and G403
G401 and G403
G401 and G403