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

Ambient Light Sensor, Headlamp Controls and Switches


Object Number: 1830031  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Body Control Module (BCM) Programming/RPO Configuration
w/TT5
Power, Ground, Serial Data, MIL, and Security
Interior Lights Dimming Schematics
Fog Lights
Park Lamp Control, Turn Signal Inputs, and Hazard Switch
Splice Pack SP106 and G106 - 1 of 2
Figure 2:

w/TT5


Object Number: 1775148  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Body Control Module (BCM) Programming/RPO Configuration
w/o TT5
Ambient Light Sensor, Headlamp Controls and Switches
B+ Bus - Underhood Fuse Block
Splice Pack SP105 and G105 - 1 of 2
Splice Pack SP105 and G105 - 1 of 2
Figure 3:

w/o TT5


Object Number: 1472883  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Body Control Module (BCM) Programming/RPO Configuration
w/TT5
B+ Bus - Underhood Fuse Block
Splice Pack SP105 and G105 - 1 of 2
Splice Pack SP105 and G105 - 1 of 2