Daytime Running Lamps (DRL)

The Daytime Running Lamps (DRL) control module is designed to automatically operate the exterior lights depending on the outside light conditions.

The DRL control module operates in 2 modes:
^ The day mode
In the day mode, the DRL control module turns ON the low beam headlamps at a reduced intensity when the DRL ambient light sensor detects daylight under the following conditions:
- The ignition switch is in the RUN position.
- The headlamps are OFF.
- The park brake is OFF.
^ The low light mode
In the low light mode, the DRL ambient light sensor detects darkness, turning ON the low beam headlamps to full intensity through circuit 10. Additionally, the DRL ambient light sensor turns ON the following lamps through circuit 9:
- The park lamps
- The side marker lamps
- The license lamps
- The tail lamps

If the engine stalls with the DRL control module in the low light mode, the DRL control module turns OFF the headlamps while the engine is being cranked. The DRL control module turns ON the following lamps while the engine is being cranked:
^ The side marker
^ The park lamps
^ The license lamps
^ The tail lamps

The following lamps operate in the usual manner:
^ The headlamp
^ The instrument panel lamp dimmer switch

The DRL control module receives voltage from the following fuses:
^ The DRL fuse through circuit 1239
^ The DIC/HVAC fuse through circuit 541

The following lamps may be operated manually at any time by using the headlamp and the instrument panel lamp dimmer switch:
^ The park lamps
^ The headlamps

The DRL module does not operate if the system voltage is less than 9 volts or greater than 18 volts.