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

Hazard and Turn Signal Switches


Object Number: 1576870  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Stop Lamp Switch
Ignition Switch - ACCY/RUN, RUN/START Bus Bars and IGN B Fuse
AIRBAG, IGN E, ISRVM, SPARE and TBC IGN 1 Fuses
B+ Bus - Underhood Fuse Block - Gas
AIRBAG, IGN E, ISRVM, SPARE and TBC IGN 1 Fuses
G302
G302
G302
Figure 2:

Stop Lamp Switch


Object Number: 1576872  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Turn Signals
Hazard and Turn Signal Switches
B+ Bus - Underhood Fuse Block - Gas
Gas - w/o JL4
G400
G401 - Passenger/Cargo
Backup Lamps and Trailer Wiring
Diesel
Gas - w/o JL4
Gas - JL4
Diesel
Backup Lamps and Trailer Wiring
G401 - Passenger/Cargo
Figure 3:

Turn Signals


Object Number: 1576874  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Park Lamp Relay Control and Front Park Lamps
Stop Lamp Switch
G347 - 1 of 3
G347 - 2 of 3
G347 - 1 of 3
Figure 4:

Park Lamp Relay Control and Front Park Lamps


Object Number: 1576875  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
License and Rear Park Lamps
Turn Signals
B+ Bus - Body Fuse Block
FRT PRK, LT REAR PRK, RT REAR PRK, TRLR PRK, UPFTR PRK LAMPS Fuses and PWR WNDW Circuit Breaker
Headlamps
Dome and Courtesy Lamp Switch Signals and Door Latch Assemblies
I/P Dimming Supply Voltage - 1 of 3 and LED Dimming Supply Voltage
G302
G100 and G101
G100 and G101
Figure 5:

License and Rear Park Lamps


Object Number: 1576876  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Stop Lamps
Park Lamp Relay Control and Front Park Lamps
FRT PRK, LT REAR PRK, RT REAR PRK, TRLR PRK, UPFTR PRK LAMPS Fuses and PWR WNDW Circuit Breaker
FRT PRK, LT REAR PRK, RT REAR PRK, TRLR PRK, UPFTR PRK LAMPS Fuses and PWR WNDW Circuit Breaker
G402 - Passenger/Cargo and G403 - PRP
G401 - Passenger/Cargo
G402 - Passenger/Cargo and G403 - PRP
Backup Lamps and Trailer Wiring
Figure 6:

Stop Lamps


Object Number: 1576877  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Backup Lamps and Trailer Wiring
License and Rear Park Lamps
B+ Bus - Underhood Fuse Block - Gas
G401 - Passenger/Cargo
G400
Backup Lamps and Trailer Wiring
Backup Lamps and Trailer Wiring
G402 - Passenger/Cargo and G403 - PRP
Figure 7:

Backup Lamps and Trailer Wiring


Object Number: 1576878  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Stop Lamps
B+ Bus - Underhood Fuse Block - Gas
Ignition Switch - ACCY/RUN, RUN/START Bus Bars and IGN B Fuse
B+ Bus - Underhood Fuse Block - Gas
Stop Lamps
Stop Lamps
License and Rear Park Lamps
Stop Lamp Switch
BTSI, BTSI BCK/UP, ECM/TCM/GLOW PLUG CNTRL MDL IGN 1, FUEL HTR, O2 SNSR A, O2 SNSR B, PCM IGN 1, SPARE and TRLR BCK/UP Fuses
Inside Rearview Mirror Schematics
G401 - Passenger/Cargo
G402 - Passenger/Cargo and G403 - PRP
G400
G302