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

DRL Module, DRL Relay


Object Number: 574586  Size: FS
Lighting Systems Components
Headlights/Daytime Running Lights (DRL) Circuit Description
Headlamp and Panel Dimmer Switch, Headlamp Dimmer Switch
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Fuse, DRL Module, Park Brake Switch, I/C
Headlamp and Panel Dimmer Switch, Headlamp Dimmer Switch
Headlamp and Panel Dimmer Switch, Headlamp Dimmer Switch
Headlamp and Panel Dimmer Switch, Headlamp Dimmer Switch
Headlamp and Panel Dimmer Switch, Headlamp Dimmer Switch
Handling Electrostatic Discharge Sensitive Parts Notice
G103 and G104
STOP/HAZ, RADIO BATT, and AUX PWR Fuses
GAUGES Fuse
GAUGES Fuse
Brake Warning Lamp Control (all except 15000lb GVW)
Indicator Lamps
G103 and G104
G200 (4 of 4)
Headlamp and Panel Dimmer Switch, Headlamp Dimmer Switch
Headlamp and Panel Dimmer Switch, Headlamp Dimmer Switch
Figure 2:

Headlamp and Panel Dimmer Switch, Headlamp Dimmer Switch


Object Number: 574588  Size: FS
Lighting Systems Components
Headlights/Daytime Running Lights (DRL) Circuit Description
Quad Headlamps, Base Headlamps
DRL Module, DRL Relay
LIGHTING and BATTERY Fuses
LIGHTING and BATTERY Fuses
DRL Module, DRL Relay
DRL Module, DRL Relay
DRL Module, DRL Relay
G200 (1 of 4)
DRL Module, DRL Relay
DRL Module, DRL Relay
DRL Module, DRL Relay
Quad Headlamps, Base Headlamps
Quad Headlamps, Base Headlamps
Figure 3:

Quad Headlamps, Base Headlamps


Object Number: 574590  Size: FS
Lighting Systems Components
Headlights/Daytime Running Lights (DRL) Circuit Description
Headlamp and Panel Dimmer Switch, Headlamp Dimmer Switch
G112
G113
G112
G113
Headlamp and Panel Dimmer Switch, Headlamp Dimmer Switch
Headlamp and Panel Dimmer Switch, Headlamp Dimmer Switch
Headlamp and Panel Dimmer Switch, Headlamp Dimmer Switch
Headlamp and Panel Dimmer Switch, Headlamp Dimmer Switch
Fog Lamp Switch, Relay and Lamps