Daytime Running Lamp: Description and Operation

CIRCUIT DESCRIPTION

For the visibility and safety of drivers, the daytime running light 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 signals (engine running signal), the DRL control module controls the operation of the high beam head lamps through DRL relay coil control. Battery voltage from fusible link (BATT) is then provided to the low beam head lamps through the DRL relay contact.

In addition to the DRL relay control, the DRL control module controls the tail relay (built in to the DRL control module) coil. Battery voltage is applied to the closed contact of the tail lamp relay and the interior illumination lamps turn on. When the DRL module detects the engine runing OFF signal, the DRL control module turns the lights off. When the DRL module detects the light switch ON (PARK or HEAD) signal, the DRL control module stops it's functions.