Domestic

The ambient light sensor is a light sensitive transistor that varies its voltage signal to the Daytime Running Lamp (DRL) module in response to changes to the outside ambient light level. When the DRL module receives this signal it will either turn on the Daytime Running Lamps (DRL) for auto headlamp operation. Any function or condition that turns on the headlights will cancel the Daytime Running Lamps (DRL) operation. The Daytime Running Lamps (DRL) illuminate the low beam headlights at a reduced intensity. With the headlight switch in the OFF position, the headlights will either be turned ON or OFF, after an approximate 30 second delay depending on whether daylight or low light conditions are sensed. The Turn B/U fuse in the I/P fuse block, supplies battery positive voltage to the Daytime Running Lamp (DRL) Module. The high beam headlamps are now in series, and split the voltage. The headlamps illuminate at half intensity. The DRL will operate when the ignition switch is in the RUN position, and the parking brake is not set or the transmission is not in park. When these conditions have been met and the ambient light sensor indicates daytime conditions, the DRL will illuminate. Ground is applied at all times from G 105 and G 106.