Courtesy Lamps

WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.

The BCM controls the courtesy lighting functions and timing by monitoring inputs from the following:

door ajar switches
ignition state
RKE system

For vehicles equipped with puddle lamps, the DDM and the PDM provide voltage to the left and right puddle lamps based on messaged input from the BCM over the MS-CAN.

The BCM sends a voltage signal to each door or tailgate ajar switch. When all the doors or tailgate are closed, all the voltage signals are pulled low, indicating closed doors. The BCM monitors the ignition state and inputs from the RKE system to determine when to supply power to the courtesy lamps. The BCM controls the power to the courtesy lamps for the illuminated entry and exit features.

For keyless entry, the BCM monitors input from the RKE transmitter (directly from the IKTs on vehicles without Keyless Entry With Push Button Start) or from the passive key (on vehicles with Keyless Entry With Push Button Start) to determine when to activate/deactivate the illuminate entry and exit functions.

The interior courtesy lamps are activated from the courtesy lamp switch mounted on the front interior lamp. The front interior lamp controls the courtesy lamp function of the remaining interior lamp(s). When the courtesy lamp button is pressed on the front interior lamp, the courtesy lamp function for all the lamps is turned on/off. If any door is open, the BCM command overrides the function of the front courtesy lamp switch and activates the courtesy lamps.