Daytime Running Lamp: Description and Operation

GENERAL INFORMATION

Junction Block Terminal Pins:

The Combination Flasher/DRL is a module providing turn signal, hazard warning, and daytime running light functions (for Canadian vehicles), and has been designed with internal relays to take advantage of low current switching requirements in the vehicle. It is plugged into the junction block at positions three and four, where all wiring associated with its operation is terminated. The junction block is adjacent to and left of the steering column of the vehicle. For diagnostic information refer to Turn Signal and Flashers.

On vehicles built for use in the United States, only position four is used. Vehicles built for use in Canada utilize both positions three and four. To gain access to the device, remove the lower steering column cover and knee blocker. Refer to Instrument Panel and Gauges.

SYSTEM FUNCTION
The Combination Flasher/DRL may be operated in its hazard warning mode either with or without the ignition circuit being active. However, in order to operate in the turn signal mode or the DRL mode, the ignition circuit must be completed to the module.

While the Combination Flasher portion is idle, there is no current drawn through the module. The device does not become active in the turn signal or hazard warning modes until a signal ground circuit is supplied to either of the turn signal inputs or the hazard warning input. With the ignition OFF, there is no current drawn through the module.

While the ignition is ON, the front turn signal filaments are illuminated steadily thus providing the DRL function. The DRL function may be inhibited by applying a signal ground input from either the park brake circuit or the headlamp relay activation circuit.