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

Center High Mounted Stop Lamp


Object Number: 778095  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Multifunction Switch (Turn Signal Switch) And Turn Signal/Hazard Flasher Module
B+ Bus Bar
Stop, Turn and Hazard Bus Bar
Multifunction Switch (Turn Signal Switch) And Turn Signal/Hazard Flasher Module
Tail, Stop and License Lamps (Export)
CRUISE Fuse, Multifunction Switch and Cruise Control Module
G102 (Except Export)
G202 (Pickup Except Crew Cab)
Inside Rear View Mirror or Driver Information Center
G420,G450 and S427 (Utility w/ Endgate and Crew Cab)
Figure 2:

Multifunction Switch (Turn Signal Switch) and Turn Signal/Hazard Flasher Module


Object Number: 669532  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Instrument Cluster Turn Signal Indicators
Center High Mounted Stop Lamp
B+ Bus Bar
Ign RUN and START Bus Bar
Center High Mounted Stop Lamp
Instrument Cluster Turn Signal Indicators
Turn Fuses
G205 (Utility and Crew Cab)
G205 (Utility and Crew Cab)
Figure 3:

Instrument Cluster Turn Signal Indicators


Object Number: 669534  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Turn Fuses
Multifunction Switch (Turn Signal Switch) And Turn Signal/Hazard Flasher Module
Turn Signal Lamps, Front and Turn Signal Fuses, Rear
Multifunction Switch (Turn Signal Switch) And Turn Signal/Hazard Flasher Module
Turn Signal Lamps, Front and Turn Signal Fuses, Rear
Multifunction Switch (Turn Signal Switch) And Turn Signal/Hazard Flasher Module
Turn Signals
Indicators
G203 and G204 (Pickup)
Headlight Leveling Schematics (Export)
G203 and G204 (Pickup)
Figure 4:

Turn Fuses


Object Number: 778440  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Turn Signal Lamps, Front and Turn Signal Fuses, Rear
Instrument Cluster Turn Signal Indicators
Multifunction Switch (Turn Signal Switch) And Turn Signal/Hazard Flasher Module
Multifunction Switch (Turn Signal Switch) And Turn Signal/Hazard Flasher Module
Park and License Lamps, Rear (Utility)
Park/Turn Signal Lamps, Marker and License Lamps, Rear(Pickup)
Park and License Lamps, Rear (Utility)
Park/Turn Signal Lamps, Marker and License Lamps, Rear(Pickup)
Figure 5:

Park/Turn Signal Lamps, Marker Lamps, and Turn Signal Fuses, Front


Object Number: 669535  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Park/Turn Signal Lamps, Rear (Utility)
Turn Fuses
Instrument Cluster Turn Signal Indicators
Instrument Cluster Turn Signal Indicators
Park/Turn Signal Lamps, Marker and License Lamps, Rear(Pickup)
Park and License Lamps, Rear (Utility)
Tail, Stop and License Lamps (Export)
FR PRK, LR PRK, RR PRK Fuses and Fog Lamp Relay (Pickup)
G109, G111, G112 and G113 (Except Export)
G109, G111, G112 and G113 (Except Export)
Figure 6:

PARK LP Power


Object Number: 669541  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Park/Turn Signal Lamps, Marker and License Lamps, Rear(Pickup)
Turn Signal Lamps, Front and Turn Signal Fuses, Rear
B+ Bus Bar
Park/Turn Signal Lamps, Marker and License Lamps, Rear(Pickup)
Park and License Lamps, Rear (Utility)
Tail, Stop and License Lamps (Export)
Headlamp Switch
Headlamp Switch
Figure 7:

Park/Turn Signal Lamps, Marker and License Lamps, Rear (Pickup)


Object Number: 669536  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Park and License Lamps, Rear (Utility)
Park/Turn Signal Lamps, Rear (Utility)
Park/Turn Signal Lamps, Rear (Utility)
FR PRK, LR PRK, RR PRK Fuses and Fog Lamp Relay (Pickup)
Turn Signal Lamps, Front and Turn Signal Fuses, Rear
Turn Fuses
G402, G422 and G475 (Sportside Pickup)
G402, G422 and G475 (Sportside Pickup)
Figure 8:

Park and License Lamps, Rear (Utility)


Object Number: 669543  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Tail, Stop and License Lamps (Export)
Park/Turn Signal Lamps, Marker and License Lamps, Rear(Pickup)
Park/Turn Signal Lamps, Rear (Utility)
FR PRK, LR PRK, RR PRK, TRL PRK Fuses and Fog Lamp Relay (Utility)
Turn Signal Lamps, Front and Turn Signal Fuses, Rear
Turn Fuses
Multifunction Switch (Turn Signal Switch) And Turn Signal/Hazard Flasher Module
G420,G450 and S427 (Utility w/ Endgate and Crew Cab)
Turn Fuses
Multifunction Switch (Turn Signal Switch) And Turn Signal/Hazard Flasher Module
G402 and G421 (Utility)
Figure 9:

Tail, Stop and License Lamps (Export)


Object Number: 669549  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Backup Lamps (Utility)
Park and License Lamps, Rear (Utility)
Park/Turn Signal Lamps, Rear (Utility)
FR PRK, LR PRK, RR PRK, TRL PRK Fuses and Fog Lamp Relay (Export)
Turn Signal Lamps, Front and Turn Signal Fuses, Rear
Center High Mounted Stop Lamp
G420,G450 and S427 (Utility w/ Endgate and Crew Cab)
S313 and S419
G402 and G421 (Utility)
Figure 10:

Backup Lamps - Utility


Object Number: 669471  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Backup Lamps (Pickup)
Tail, Stop and License Lamps (Export)
Ign RUN and START Bus Bar
Park/Neutral Position (PNP) Switch and Automatic TransmiSsion Shift Lock Solenoid (Pickup and 2-Door Utility w/ Column Shift)
Automatic Day-Night Mirror Schematics
S313 and S419
G420,G450 and S427 (Utility w/ Endgate and Crew Cab)
S320 and S420
Figure 11:

Backup Lamps - Pickup


Object Number: 669473  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Backup Lamps (Utility)
Ign RUN and START Bus Bar
Park/Neutral Position (PNP) Switch and Automatic TransmiSsion Shift Lock Solenoid (Pickup and 2-Door Utility w/ Column Shift)
B/U LP, TRL B/U and BTSI Fuses (Automatic Transmission)
G402, G422 and G475 (Fleetside Pickup)
G402, G422 and G475 (Fleetside Pickup)