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. With a minimal amount of load on the charging system. With the ignition switch in ON position, battery voltage is applied to the head lamp relay coils and daytime running lights (DRL) control module.

As the DRL control module detects both the generator running and the parking brake switch OFF signals, ground is provided to the DRL relay.

Battery voltage from DRL fuse is then provided to the high beam head lamp through DRL relay contact and DRL resistor.

When the DRL module detects the engine running 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 its functions.