Lighting and Horns: Description and Operation

Exterior Lights System Description

Daytime Running Lights

The daytime running lights system is composed of the relay control module, the combination switch control unit, the left and right daytime running lights, and the DRL indication on the multi-information display (MID). The daytime running lights operate with the ignition switch in ON (II), the headlights off, and the parking brake released.

When the daytime running lights are on, the relay control module turns the left and right daytime running lights control circuit on and off (duty cycle) which provides a reduced voltage (approximately 6-8 volts) via the No. 1 and No. 2 fuses in the under-hood fuse/relay box. The DRL comes on with reduced brightness.

The gauge control module will show the DRL indication on the multi-information display (MID) with the ignition switch in ON (II) and the parking brake released when a problem is detected with the daytime running lights circuit.

NOTE: The daytime running lights are disabled when the ignition switch is turned to LOCK (0). To keep the daytime running lights from coming on, apply the parking brake switch while the ignition switch is in the LOCK (0) position. When you then turn the ignition switch back to ON (II), the daytime running lights will not come on until the parking brake is released.