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

Park Lamp Relay - Domestic


Object Number: 1248367  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Park Lamp Relay - Export
B+ Bus Bar - 2 of 2
Headlights/DRL Control
G203 - 1 of 3
G203 - 2 of 3
G203 - 1 of 3
Figure 2:

Park Lamp Relay - Export


Object Number: 1248374  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Front Park Lamps - Domestic
Park Lamp Relay - Domestic
B+ Bus Bar - 2 of 2
Daytime Running Lamps (DRL) - Export
Headlights/DRL Control
G203 - 1 of 3
G203 - 2 of 3
G203 - 1 of 3
Figure 3:

Front Park Lamps - Domestic


Object Number: 1248380  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Front Park Lamps - Export
Park Lamp Relay - Export
Left Turn Signals - Domestic - GMC
Park Lamp Relay - Export
Right Turn Signals - Domestic - GMC
G100 and G101
G100 and G101
G100 and G101
Figure 4:

Front Park Lamps - Export


Object Number: 1248411  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Interior Park
Front Park Lamps - Domestic
S100 - Export
G100 and G101
S101 - Export
Figure 5:

Interior Park


Object Number: 1248419  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Right Rear Park Lamps - GMC
Front Park Lamps - Export
Park Lamp Relay - Domestic
Power Take-Off (PTO) Schematics
Trailer Wiring/Connector
G200 - 1 of 3
G200 - 1 of 3
G200 - 2 of 3
FRT PARK, INT PARK, and TRL PARK Fuses - Domestic
Figure 6:

Right Rear Park Lamps - GMC


Object Number: 1248424  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Right Rear PArk Lamps - Chevrolet
Interior Park
Park Lamp Relay - Domestic
G401 and G402
G302
G403
G401 and G402
Figure 7:

Right Rear Park Lamps - Chevrolet


Object Number: 1248431  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Left Rear Park Lamps - GMC
Right Rear Park Lamps - GMC
Park Lamp Relay - Domestic
Right Turn Signals - Domestic - Chevrolet
G403
G302
G403
G401 and G402
Figure 8:

Left Rear Park Lamps - GMC


Object Number: 1248436  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Left Rear Park Lamps - Chevrolet
Right Rear PArk Lamps - Chevrolet
Park Lamp Relay - Domestic
G401 and G402
G302
G403
G401 and G402
Figure 9:

Left Rear Park Lamps - Chevrolet


Object Number: 1248465  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Stop Lamps - GMC
Left Rear Park Lamps - GMC
Park Lamp Relay - Domestic
Left Turn Signals - Domestic - Chevrolet
G401 and G402
G302
G403
G401 and G402
Figure 10:

Stop Lamps - GMC


Object Number: 1248499  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Stop Lamps - Chevrolet
Left Rear Park Lamps - Chevrolet
HVAC/ECAS, RR HVAC, BLOWER, RR DEFOG, STOP LP, and TREC Fuses
G302
G403
VEH CHMSL, VEH STOP, LT TRLR ST/TRN, and RT TRLR ST/TRN Fuses
VEH CHMSL, VEH STOP, LT TRLR ST/TRN, and RT TRLR ST/TRN Fuses
G401 and G402
G401 and G402
Trailer Wiring/Connector
Trailer Wiring/Connector
G200 - 1 of 3
G200 - 3 of 3
G200 - 3 of 3
G200 - 1 of 3
G200 - 1 of 3
Figure 11:

Stop Lamps - Chevrolet


Object Number: 1248510  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Turn Signal Multifunction
Stop Lamps - GMC
HVAC/ECAS, RR HVAC, BLOWER, RR DEFOG, STOP LP, and TREC Fuses
G302
G403
G401 and G402
VEH CHMSL, VEH STOP, LT TRLR ST/TRN, and RT TRLR ST/TRN Fuses
VEH CHMSL, VEH STOP, LT TRLR ST/TRN, and RT TRLR ST/TRN Fuses
Trailer Wiring/Connector
Trailer Wiring/Connector
G200 - 3 of 3
G200 - 3 of 3
G200 - 1 of 3
G200 - 1 of 3
G200 - 1 of 3
Figure 12:

Turn Signal Multi-Function


Object Number: 1248523  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Left Turn Signals - Domestic - GMC
Stop Lamps - Chevrolet
Ignition Switch - ACC/RUN and RUN/START Bus Bars
IGN E Fuse
IGN E Fuse
G203 - 3 of 3
G203 - 1 of 3
G203 - 2 of 3
G203 - 2 of 3
Figure 13:

Left Turn Signals - Domestic - GMC


Object Number: 1248554  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Left Turn Signals - Export - GMC
Turn Signal Multifunction
Front Park Lamps - Domestic
G401 and G402
G100 and G101
G302
G403
G401 and G402
Figure 14:

Left Turn Signals - Export - GMC


Object Number: 1248563  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Left Turn Signals - Domestic - Chevrolet
Left Turn Signals - Domestic - GMC
G401 and G402
S100 - Export
G100 and G101
G302
G403
G401 and G402
Figure 15:

Left Turn Signals - Domestic - Chevrolet


Object Number: 1248568  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Left Turn Signals - Export - Chevrolet
Left Turn Signals - Export - GMC
Left Rear Park Lamps - Chevrolet
G401 and G402
G100 and G101
G401 and G402
G302
G403
G401 and G402
Figure 16:

Left Turn Signals - Export - Chevrolet


Object Number: 1248569  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Right Turn Signals - Domestic - GMC
Left Turn Signals - Domestic - Chevrolet
G401 and G402
S100 - Export
G100 and G101
G401 and G402
G302
G403
G401 and G402
Figure 17:

Right Turn Signals - Domestic - GMC


Object Number: 1248570  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Right Turn Signals - Export - GMC
Left Turn Signals - Export - Chevrolet
G401 and G402
Left Rear Park Lamps - Chevrolet
G100 and G101
G302
G403
G401 and G402
Figure 18:

Right Turn Signals - Export - GMC


Object Number: 1248571  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Right Turn Signals - Domestic - Chevrolet
Right Turn Signals - Domestic - GMC
G401 and G402
S101 - Export
G100 and G101
G302
G403
G401 and G402
Figure 19:

Right Turn Signals - Domestic - Chevrolet


Object Number: 1248572  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Right Turn Signals - Export - Chevrolet
Right Turn Signals - Export - GMC
G401 and G402
Front Park Lamps - Domestic
G100 and G101
G401 and G402
G302
G403
G401 and G402
Figure 20:

Right Turn Signals - Export - Chevrolet


Object Number: 1248573  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Exterior Illumination Lamps
Right Turn Signals - Domestic - Chevrolet
G401 and G402
S101 - Export
G100 and G101
G401 and G402
G302
G403
G401 and G402
Figure 21:

Exterior Illumination Lamps


Object Number: 1248574  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Backup Lamps - Chevrolet
Right Turn Signals - Export - Chevrolet
SP205 - 1 of 2
Figure 22:

Backup Lamps - GMC


Object Number: 1248575  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Trailer Wiring/Connector
Backup Lamps - Chevrolet
SEO B2, RR DEFOG, SEO IGN, and B/U LP Fuses
Automatic Transmission Shift Lock Control Schematics
G401 and G402
G302
G403
G401 and G402
Controlled/Monitored Subsystem References
Trailer Wiring/Connector
Power, Outside Air Temp, and Light Sensors
G403
Figure 23:

Backup Lamps - Chevrolet


Object Number: 1248576  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Backup Lamps - GMC
Exterior Illumination Lamps
SEO B2, RR DEFOG, SEO IGN, and B/U LP Fuses
Automatic Transmission Shift Lock Control Schematics
G401 and G402
G302
G403
G401 and G402
Controlled/Monitored Subsystem References
G401 and G402
G401 and G402
Trailer Wiring/Connector
Power, Outside Air Temp, and Light Sensors
G403
Figure 24:

Trailer Wiring/Connector


Object Number: 1248577  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Backup Lamps - GMC
ABS, VSES/ECAS, STUD #1, STUD #2, and TBC BATT Fuses
ABS, VSES/ECAS, STUD #1, STUD #2, and TBC BATT Fuses
ABS, VSES/ECAS, STUD #1, STUD #2, and TBC BATT Fuses
ABS, VSES/ECAS, STUD #1, STUD #2, and TBC BATT Fuses
Interior Park
Stop Lamps - Chevrolet
Stop Lamps - GMC
Stop Lamps - Chevrolet
Stop Lamps - GMC
Backup Lamps - Chevrolet
Backup Lamps - GMC
G200 - 3 of 3
G200 - 1 of 3
G200 - 1 of 3
G302
G403
G401 and G402
G200 - 1 of 3
Figure 25:

Roof Beacon (5G4/TRW)


Object Number: 1248578  Size: FS
Master Electrical Component List
Wrecker Lighting (5X7)
Mobile Radio (9L4)
B+ Bus Bar - 1 of 2
RTD, IPC/DIC, SEO B1, SUNROOF, EAP, and RR WPR Fuses
LED Dimming Supply Voltage - 3 of 3
I/P Dimming Supply Voltage - 5 of 6
G200 - 3 of 3
G200 - 3 of 3
G200 - 1 of 3
G200 - 1 of 3
G200 - 1 of 3
G304 and G305
Figure 26:

Emergency Vehicle Lighting (5Y0)


Object Number: 1348129  Size: FS
Master Electrical Component List
Wrecker Lighting (5X7)
B+ Bus Bar - 1 of 2
ABS, VSES/ECAS, STUD #1, STUD #2, and TBC BATT Fuses
RTD, IPC/DIC, SEO B1, SUNROOF, EAP, and RR WPR Fuses
RTD, IPC/DIC, SEO B1, SUNROOF, EAP, and RR WPR Fuses
LED Dimming Supply Voltage - 3 of 3
I/P Dimming Supply Voltage - 5 of 6
G200 - 3 of 3
G200 - 3 of 3
G200 - 1 of 3
G200 - 1 of 3
G403
G200 - 1 of 3