Headlamp: Description and Operation

The headlamp system with daytime running lamps is controlled by the Instrument Cluster. The system operates by allowing the headlamps to operate at a reduced intensity when the vehicle is operating (the engine is running and transaxle is not in the PARK position and the normal headlamps are not on. The Instrument Cluster turns the system on by grounding the 592 circuit, thereby energizing the Daytime Running Lamps (DRL) Relay. This will allow a reduced voltage (6 volts) to flow across the headlamps. If the car has optional fog lamps, the DRL and Fog Lamp Relay will also be energized, with the Park lamps on, allowing normal fog lamp operation. When the headlamp switch is turned to the ON position, the Instrument Cluster allows normal headlamp operation.

The Instrument Cluster also has an input from the Park Brake. If the Park Brake is in the on position, the DRL will remain disabled until the Park Brake is put in the off position. With an automatic transaxle, the Instrument Cluster will also disable the DRL until the transaxle has been taken out of the PARK position.