Daytime Running Lamps

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Vehicles equipped with this option or manufactured for sale in Canada illuminate multiple Light-Emitting Diode (LED) units in both front lamp units when the engine is running, the parking brake is released and the exterior lamps are turned OFF. The BCM must be programmed appropriately for this feature to be enabled. Once enabled, anytime the BCM receives electronic messages over the CAN data bus from the PCM indicating the engine is running, a hard wired multiplex input from the headlamp switch indicating the status of the headlamp switch is OFF and a hard wired input from the park brake switch indicating that the parking brake is released, the BCM provides an output to the appropriate LED units to produce illumination. If a turn signal is activated while the DRL units are active, the DRL for the same side of the vehicle as the indicated turn is extinguished until the turn signal is cancelled to permit clear signal visibility.

The Daytime Running Lamps (DRL) are illuminated when the engine is started and the transmission is in any gear except park. The lights will illuminate at less then 50% of normal intensity. If the parking brake is applied, the DRL will turn OFF. Also, if a turn signal is activated, the DRL on the same side of the vehicle may turn off for the duration of the turn signal activation. Once that turn is completed and the turn signal depletes, the DRL lamp will illuminate once again.