Daytime Running Lamp: Description and Operation

CIRCUIT DESCRIPTION

For the visibility and safety of drivers, the daytime running lights will turn on automatically when the engine is running. Under this condition, the head lamps will illuminate with a minimal amount of load on the charging system. As the DRL control module detects the generator running signal (engine running signal), the DRL control module controls the operation of the high beam head lamps. The intensity of the high beam head lamps is controlled through the DRL resistor.

In addition to the head lamp relay control, the DRL control module controls the tail lamp relay coil to turn on the interior illumination lamps. When the tail lamp relay coil is energized, battery voltage is applied to the closed contact of tail lamp relay and the tail lamps light. When the DRL module detects the engine running OFF signal and the parking brake switch signal, the DRL control module turns off the lights. When the DRL module detects light switch ON (PARK or HEAD) signal, the DRL control module stops its function.