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

Headlamp Switch, Ambient Light Sensor (CJ2)


Object Number: 411064  Size: FS
Lighting Systems Components
Headlights Circuit Description
Headlamp Switch, Ambient Light Sensor (C67)
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Instrument Panel and Console Dimming
Dimmer Control
Serial Data Class 2
G200 (1 of 3)
Handling ESD Sensitive Parts Notice
Temperature Sensors W/CJ2
IP, CIGAR, AUX PWR, and C/LTR Fuses and CIGAR Relay
Figure 2:

Headlamp Switch, Ambient Light Sensor (C67)


Object Number: 397666  Size: FS
Lighting Systems Components
Headlights Circuit Description
DRL, High Beam Headlamps, Dimmer Switch
Headlamp Switch, Ambient Light Sensor (CJ2)
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Dimmer Control
Instrument Panel and Console Dimming
Serial Data Class 2
G200 (1 of 3)
Handling ESD Sensitive Parts Notice
IP, CIGAR, AUX PWR, and C/LTR Fuses and CIGAR Relay
Figure 3:

DRL, High Beam Headlamps, Dimmer Switch


Object Number: 397673  Size: FS
Lighting Systems Components
Headlights Circuit Description
Low Beam Headlamps
Headlamp Switch, Ambient Light Sensor (C67)
Low Beam Headlamps
G103
Handling ESD Sensitive Parts Notice
Low Beam Headlamps
G401 (2 of 2)
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
G103
G401 (2 of 2)
G200 (1 of 2)
G200 (1 of 2)
High Beam, Low Beam and DRL Relays, High Beam and Low Beam Fuses (U/HBEC)
High Beam, Low Beam and DRL Relays, High Beam and Low Beam Fuses (U/HBEC)
High Beam, Low Beam and DRL Relays, High Beam and Low Beam Fuses (U/HBEC)
Figure 4:

Low Beam Headlamps


Object Number: 397671  Size: FS
Lighting Systems Components
Headlights Circuit Description
DRL, High Beam Headlamps, Dimmer Switch
Handling ESD Sensitive Parts Notice
DRL, High Beam Headlamps, Dimmer Switch
Park Lamp Relay
Serial Data Class 2
Wiper Motor, Washer Pump Motor, Outside Moisture Sensor
DRL, High Beam Headlamps, Dimmer Switch
G401 (2 of 2)
G103
G401 (2 of 2)
High Beam, Low Beam and DRL Relays, High Beam and Low Beam Fuses (U/HBEC)