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

Hazard Switch, Park Lamp Control, and Turn Signal/Stop Lamp Inputs


Object Number: 1566545  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Roof Marker Lamps (UNH), License Lamp and Park Lamps
B+ Bus - Underhood Fuse Block - 2 of 2
Center High Mount Stop Lamps (CHMSL) and Stop Lamp Switch
Ambient Light Sensor, Headlamp Controls and Switches
Dome Lamp, Footwell Courtesy Lamps, and Vanity Mirror Lamps
Interior Lights Dimming Schematics
Interior Lights Dimming Schematics
G106
Figure 2:

Roof Marker Lamps (UNH), License Lamp and Park Lamps


Object Number: 1566546  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Turn Signal/Stop Lamps
Hazard Switch, Park Lamp Control, and Turn Signal/Stop Lamp Inputs
FRT/PRK, LR PRK, RR PRK, and TRLR Fuses
G105
G350
G340 and G345
G420
Figure 3:

Turn Signal/Stop Lamps


Object Number: 1566547  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Center High Mount Stop Lamps (CHMSL) and Stop Lamp Switch
Roof Marker Lamps (UNH), License Lamp and Park Lamps
B+ Bus - Underhood Fuse Block - 1 of 2
G105
G350
G340 and G345
Trailer Wiring
Trailer Wiring
Figure 4:

Center High Mount Stop Lamps (CHMSL) and Stop Lamp Switch


Object Number: 1566548  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Grille Mounted Off Road Lamps - UNR
Turn Signal/Stop Lamps
B+ Bus - Underhood Fuse Block - 1 of 2
Trailer Wiring
G350
Figure 5:

Grille Mounted Off Road Lamps - UNR


Object Number: 1677205  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Roof Mounted Off Road Lamps - UNJ
Center High Mount Stop Lamps (CHMSL) and Stop Lamp Switch
B+ Bus - Underhood Fuse Block - 1 of 2
ETC, LH PWR WNDW, OXY SENSOR, PWR SNRF/WPR/SW, REAR WPR, RH PWR WNDW, RR WSH PMP, and SPO OUTPUT Fuses
G105
G106
Figure 6:

Roof Mounted Off Road Lamps - UNJ


Object Number: 1677207  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Backup Lamps
Grille Mounted Off Road Lamps - UNR
B+ Bus - Underhood Fuse Block - 1 of 2
G105
G106
Figure 7:

Backup Lamps


Object Number: 1566699  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Trailer Wiring
Roof Mounted Off Road Lamps - UNJ
B+ Bus - Underhood Fuse Block - 1 of 2
G105
RUN/CRNK Relay Bus - 2 of 3, ABS/VSES, A/C CLUTCH, BCK/UP, and IGN1 Fuses
Trailer Wiring
G105
G350
G340 and G345
Figure 8:

Trailer Wiring


Object Number: 1566700  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Backup Lamps
B+ Bus - Underhood Fuse Block - 1 of 2
Backup Lamps
Center High Mount Stop Lamps (CHMSL) and Stop Lamp Switch
G420
G106
Turn Signal/Stop Lamps
Turn Signal/Stop Lamps