DRL Circuit

The daytime running lamp control module operates the daytime running lamps when the vehicle is operating and the headlamps are not on. The daytime running lamp control module is powered when the ignition switch is in the RUN or START position by the GAUGES fuse 4 through CKT 39 (PNK). The daytime running lamp control module is grounded by CKT 150 (BLK) to ground G201. The daytime running lamp control module determines if the vehicle is operating when powered from GAUGES fuse 4 and when the parking brake is released.

The parking brake closes the contacts of the park brake warning switch when engaged. CKT 1134 (LT BLU) is grounded. CKT 1134 (LT BLU) ground connection is used as an input to the DRL module and indicates the parking brake is engaged. The grounded input with the ignition switch in START is also used as an input to the DRL module in operation of the BRAKE warning lamp.

If CKT 1134 (LT BLU) is not grounded, CKT 9 (BRN) has no voltage and CKT 39 (PNK) has voltage, and the daytime running lamp control module operates to turn on the daytime running lamps. The module does this by closing the internal contacts (logically equivalent) in order to ground CKT 592 (LT GRN/WHT) from the daytime running lamp rear park lamp relay. The coils of the relays will energize and switch to the normally-open contacts. The normally-open contacts are powered at all times from the DRL fuse 15 through CKT 340 (ORN). The daytime running lamp relay supplies voltage to the low beam headlamps. The daytime running lamp rear park lamp relay supplies voltage to the rear park lamps, the taillamps (park and stop), and the rear license plate lamps.