Rear Side Door Courtesy Lamps

When the rear side door is opened, the rear side door jamb switch sends two ground signals. The first signal is a door jamb input to the BCM that wakes the BCM. When the BCM wakes up it will then energize the delayed interior lamps relay, supplying voltage to the rear side door courtesy lamp. The rear side door jamb switch also provides a second ground for the rear side door courtesy lamp and the lamp will illuminate.