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

Headamp/DRL Controls


Object Number: 1608207  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Headlights - except Z75
G203 3 of 3
Park Lamp Relay - w/o VD1
Temperature Controls and Sunload Sensors
G203 3 of 3
G203 2 of 3
G203 1 of 3
G203 1 of 3
Figure 2:

Headlamp -- Except Z75


Object Number: 1608208  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Headlights - w/ Z75
Headlights/DRL Controls
B+ Bus - 1 of 2
G100, G105 1 of 4
G100, G105 2 of 4
G104 and G107
G104 and G107
Figure 3:

Headlamps -- w/Z75


Object Number: 1608209  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Daytime Running Lamps (DRL) - w/o VD1
Headlights - except Z75
B+ Bus - 1 of 2
G100, G105 2 of 4
G100, G105 1 of 4
G104 and G107
G104 and G107
Figure 4:

Daytime Running Lamps (DRL) - Except VD1


Object Number: 1608210  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Daytime Running Lamps (DRL) - w/ VD1
Headlights - w/ Z75
B+ Bus - 1 of 2
G100, G105 2 of 4
G100, G105 1 of 4
G100, G105 1 of 4
Figure 5:

Daytime Running Lamps (DRL) - w/VD1


Object Number: 1608211  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Daytime Running Lamps (DRL) - w/o VD1
B+ Bus - 1 of 2
B+ Bus - 1 of 2
Front Park Lamps - w/ VD1
Front Park Lamps - w/ VD1
G100, G105 4 of 4
G100, G105 1 of 4
G100, G105 3 of 4