Roof Rail Courtesy Lamps

The roof rail courtesy lamps are turned ON by the dimmer switch, the individual roof rail courtesy lamp switch, or during illuminated entry.

During illuminated entry or when the dimmer switch is ON the Body Control Module (BCM) wakes up and then energizes the courtesy lamps supply voltage circuit, supplying voltage to all interior lamps. The BCM pulls the interior lamp control circuit low, providing ground to the roof rail courtesy lamps and all courtesy lamps.

The roof rail courtesy lamps can be turned on from the individual roof rail courtesy lamp switch. The BCM supplies voltage through the courtesy lamps supply voltage circuit when the BCM is awake. Manually turning on the roof rail courtesy lamp switch provides a ground path.