ION L4-2.2L VIN F (2004)
Daytime Running Lamp: Description and Operation
DAYTIME RUNNING LAMPS (DRL)
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:
-
The ignition switch is in the RUN position.
-
The headlamps are OFF.
-
The park brake is OFF (released).
-
The RH or LH turn signal is OFF.
