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Daytime Running Lamps (DRL)

WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The front turn signal lamps are used as both Daytime Running Lamps and turn signals lamps. The Body Control Module (BCM) illuminates the front turn signals lamps in a non flashing mode for Daytime Running Lamps (DRL) operation. If the turn signal switch is activated during Daytime Running Lamp operation, the appropriate turn signal will flash.

The Daytime Running Lamps (DRL) are designed to be automatically illuminated when the ignition is ON and the outside (ambient) light level is high as in daytime conditions (day mode). The Daytime Running Lamps (DRL) will not operate if the ambient light levels are too low (night mode). Light levels are detected by the ambient light sensor, a light sensitive transistor that varies its voltage signal to the Body Control Module (BCM) in response to changes to the ambient light level. When the BCM receives a day mode signal from the ambient light sensor it will then illuminate the DRL lamps. The automatic headlamps and park lamps will not operate when the DRL lamps are on.

In the day mode, the ambient light sensor detects daylight and the BCM applies voltage to the LH and RH front turn signal lamps illuminating the lamps under the following conditions:

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