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

Brake, Hazard, and Turn Signal Switching


Object Number: 2151251  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Turn Signal and Brake Lights
B+ Bus 2 of 2
Fuse Block - Underhood F35 and F16 Fuses
Power, Ground , Class 2, and GM Low Speed Serial Data (CAN A)
G203, G204, and G205
G203, G204, and G205
Figure 2:

Turn Signal and Brake Lights


Object Number: 2151252  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Park Lamps
Brake, Hazard, and Turn Signal Switching
G101 and G102
G101 and G102
G101 and G102
G101 and G102
G403
Figure 3:

Park Lamps


Object Number: 2151253  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Backup Lamps
Turn Signal and Brake Lights
Headlights/Daytime Running Lights (DRL) Schematics
Fog Lights Schematics
Interior Lights Dimming Schematics
Power, Ground , Class 2, and GM Low Speed Serial Data (CAN A)
G101 and G102
G101 and G102
G101 and G102
G101 and G102
G403
Figure 4:

Backup Lamps


Object Number: 2151254  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Park Lamps
Power, Ground , Class 2, and GM Low Speed Serial Data (CAN A)
G100, G103, G104, G105, and G106
G403