Courtesy Lamp: Description and Operation

The Body Control Module (BCM) has direct control over all of the vehicle's courtesy lamps except for the driver and passenger front courtesy lamps. The Driver Door Module (DDM) and the Passenger Door Module (PDM) turn these lamps on based on requests sent over the PCI Bus from the BCM. The courtesy lamps will illuminate if:
- Any door is ajar and the courtesy lamp switch on the headlamp switch is not in the dome OFF position.
- The courtesy lamp switch on the headlamp switch is in the dome ON position.
- A Remote Keyless Entry unlock message is received.
- The operator unlocks the driver door with the key (with VTSS only).