Daytime Running Lamps (DRL)
| Refer to FEATURES INDEX . |
Vehicles equipped with the DRL feature illuminate both headlamps at a reduced intensity when the engine is running, the parking brake is released, the headlamps are turned OFF, and the automatic transmission gear selector lever is in any position except PARK. The park lamps may be ON or OFF for DRL to operate. For vehicles with a manual transmission, the DRL will operate in any transmission gear selector lever position. 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 Powertrain Control Module (PCM) indicating the engine is running, from the Instrument Panel Cluster (IPC) indicating the status of the left (lighting) multifunction switch is in any position except headlamps ON and the parking brake lever is released, the BCM provides a pulse width modulated voltage output to the headlamps through high side drivers on the right and left high beam feed circuits to produce illumination at a reduced intensity.
DRL Dropout - The BCM will drop the DRL output when either turn signal is active, the hazard lamps are active or an EARS event is active.
High or Low Beam DRL - If the BCM configuration determines if the high or low beam will be used with the DRL. By default, low beams are used.