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

Center High Mounted Stop Lamp


Object Number: 885932  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Multifunction Switch and Turn Signal Lamp Flasher
B+ Bus Bar
Stop, Turn and Hazard Bus Bar
G102 - Except Export
VECHMSL, TRCHMSL Fuses and CHMSL Relay
G202 - Pickup Except Crew Cab
G420, G450 and S427 - Utility and Crew Cab
Tail, Stop and License Lamps - Export
Multifunction Switch and Turn Signal Lamp Flasher
Figure 2:

Multifunction Switch and Turn Signal Lamp Flasher


Object Number: 793443  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Instrument Cluster Turn Signal Indicators
Center High Mounted Stop Lamp
Center High Mounted Stop Lamp
B+ Bus Bar
Ign RUN and START Bus Bar
Instrument Cluster Turn Signal Indicators
Turn Signal Fuses
G205 - Utility and Crew Cab
G205 - Utility and Crew Cab
Figure 3:

Instrument Cluster Turn Signal Indicators


Object Number: 885950  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Turn Signal Fuses
Multifunction Switch and Turn Signal Lamp Flasher
Park/Turn Signal Lamps, Marker Lamps and Turn Signal Fuses, Front
Multifunction Switch and Turn Signal Lamp Flasher
Park/Turn Signal Lamps, Marker Lamps and Turn Signal Fuses, Front
Multifunction Switch and Turn Signal Lamp Flasher
G203 and G204 - Pickup
G203 and G204 - Utility w/Manual A/C
G203 and G204 - Pickup
Figure 4:

Turn Signal Fuses


Object Number: 793445  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Park/Turn Signal Lamps, Marker Lamps and Turn Signal Fuses, Front
Instrument Cluster Turn Signal Indicators
Multifunction Switch and Turn Signal Lamp Flasher
Park and License Lamps, Rear - Utility
Park/Turn Signal Lamp, Marker and License Lamps, Rear - Pickup
Park and License Lamps, Rear - Utility
Park/Turn Signal Lamp, Marker and License Lamps, Rear - Pickup
Figure 5:

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


Object Number: 793446  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Park Lamp Control
Turn Signal Fuses
Instrument Cluster Turn Signal Indicators
Park/Turn Signal Lamp, Marker and License Lamps, Rear - Pickup
Park and License Lamps, Rear - Utility
Tail, Stop and License Lamps - Export
G111 and G112 - Except Export
G111 and G112 - Export
FR PRK, LR PRK, RR PRK Fuses and Fog Lamp Relay - Pickup
Figure 6:

Park Lamp Control


Object Number: 793448  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Park/Turn Signal Lamp, Marker and License Lamps, Rear - Pickup
Park/Turn Signal Lamps, Marker Lamps and Turn Signal Fuses, Front
B+ Bus Bar
ILLUM, STG WHL ILLUM, and PARK LP Fuses
Headlamp Switch
Headlamp Switched Interior Lamps
Park/Turn Signal Lamp, Marker and License Lamps, Rear - Pickup
Park and License Lamps, Rear - Utility
Tail, Stop and License Lamps - Export
Figure 7:

Park/Turn Signal Lamp, Marker and License Lamps, Rear - Pickup


Object Number: 793449  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Park and License Lamps, Rear - Utility
Park Lamp Control
Park Lamp Control
Park/Turn Signal Lamps, Marker Lamps and Turn Signal Fuses, Front
FR PRK, LR PRK, RR PRK Fuses and Fog Lamp Relay - Pickup
G402, G422 and G475 - Fleetside Pickup
G402, G422 and G475 - Fleetside Pickup
Turn Signal Fuses
Figure 8:

Park and License Lamps, Rear - Utility


Object Number: 857094  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Tail, Stop and License Lamps - Export
Park/Turn Signal Lamp, Marker and License Lamps, Rear - Pickup
Park Lamp Control
FR PRK, LR PRK, RR PRK Fuses and Fog Lamp Relay - Pickup
Park/Turn Signal Lamps, Marker Lamps and Turn Signal Fuses, Front
Turn Signal Fuses
Turn Signal Fuses
G420, G450 and S427 - Utility and Crew Cab
G402 and G421 - Utility
Figure 9:

Tail, Stop and License Lamps - Export


Object Number: 857103  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Backup Lamps - Utility
Park and License Lamps, Rear - Utility
Park Lamp Control
FR PRK, LR PRK, RR PRK Fuses and Fog Lamp Relay - Pickup
Park/Turn Signal Lamps, Marker Lamps and Turn Signal Fuses, Front
Center High Mounted Stop Lamp
S313 and S419
S320 and S420
G420, G450 and S427 - Utility and Crew Cab
G402 and G421 - Utility
Figure 10:

Backup Lamps - Utility


Object Number: 1542166  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
B/U LP, TRL B/U and BTSI Fuses - Automatic Transmission
B/U LP, TRL B/U and BTSI Fuses - Automatic Transmission
S313 and S419
G420, G450 and S427 - Utility and Crew Cab
S320 and S420
Figure 11:

Backup Lamps - Pickup


Object Number: 1542170  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Backup Lamps - Utility
Ign RUN and START Bus Bar
B/U LP, TRL B/U and BTSI Fuses - Automatic Transmission
B/U LP, TRL B/U and BTSI Fuses - Automatic Transmission
G402, G422 and G475 - Fleetside Pickup
G402, G422 and G475 - Fleetside Pickup