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

Power and Headlamp Switch


Object Number: 680709  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
FR PRK LPS, LR PRK LP, RR PRK LP, and TRL PRK LP Fuses
PARK LP, FR PRK, LR PRK, RR PRK, and TRL PRK Fuses
B+ Bus Bar
ILLUM and PARK LP Fuses
Power, Ground and BCM
Power, Headlamp Switch, and Multifunction Switch
G117
ILLUM and PARK LP Fuses
FR PRK LPS, LR PRK LP, RR PRK LP, and TRL PRK LP Fuses
Figure 2:

FR PRK LPS, LR PRK LP, RR PRK LP, and TRL PRK LP Fuses


Object Number: 680710  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Turn Signal Switch, RH TURN, RH REAR TURN, and TRL TURN Fuses
Power and Headlamp Switch
Power and Headlamp Switch
PARK LP, FR PRK, LR PRK, RR PRK, and TRL PRK Fuses
G111 and G112
G111 and G112
G111 and G112
S313 and S419
G450
S320 and S420
G402 and G420
Figure 3:

Turn Signal Switch, RH TURN, RH REAR TURN, and TRL TURN Fuses


Object Number: 680712  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Hazard Switch, TURN, and HAZ LP Fuses
FR PRK LPS, LR PRK LP, RR PRK LP, and TRL PRK LP Fuses
Instrument Panel Cluster (IPC), LT TURN and RT TURN Fuses
Hazard Switch, TURN, and HAZ LP Fuses
G450
G111 and G112
G111 and G112
Figure 4:

Hazard Switch, TURN, and HAZ LP Fuses


Object Number: 680713  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
STOP LP, VEH HMSL, and TRL HMSL Fuses
Turn Signal Switch, RH TURN, RH REAR TURN, and TRL TURN Fuses
Turn Signal Switch, RH TURN, RH REAR TURN, and TRL TURN Fuses
Instrument Panel Cluster (IPC), LT TURN and RT TURN Fuses
Ign START, RUN and ACC Bus Bar
G111 and G112
G111 and G112
G450
G200 and G201
Power
Hazard Switch, Radio, Instrument Panel Cluster (IPC) And Ground
SP203
Figure 5:

STOP LP, VEH HMSL, and TRL HMSL Fuses


Object Number: 680714  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Backup Lights
Hazard Switch, TURN, and HAZ LP Fuses
B+ Bus Bar
Cruise Control Schematics
S320 and S420
G450
Figure 6:

Backup Lights


Object Number: 680715  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
STOP LP, VEH HMSL, and TRL HMSL Fuses
Ign START, RUN and ACC Bus Bar
S313 and S419
B/U LP, OXYSEN, ENG I, TRL B/U, VEH B/U and BTSI Fuses
B/U LP, OXYSEN, ENG I, TRL B/U, VEH B/U and BTSI Fuses
G450
S320 and S420