Courtesy Lamps

WARNING: This page is about a different car, the 2021 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

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

Ignition state
Courtesy lamp switch (integrated into the overhead console)
Door ajar switches
Liftgate ajar switch (manual liftgate)
RGTM (power liftgate only)
RKE system

The BCM sends a voltage signal to each door ajar switch. When the doors are closed, the circuit is switched to ground and the voltage is pulled low, indicating closed doors.

For the manual liftgate, the BCM sends a voltage signal to the liftgate latch. When the liftgate is closed, the circuit is switched to ground and the voltage is pulled low, indicating a closed liftgate.

For the power liftgate, the BCM sends a voltage signal to the RGTM. When the liftgate is closed, the circuit is switched to ground and the voltage is pulled low, indicating a closed liftgate.

The BCM monitors the ignition state and inputs from the RKE system to determine when to energize the interior light relay. When the interior light relay is energized, voltage is provided to the interior lamps. The BCM controls the voltage side of the courtesy lamps for the illuminated entry and exit features.

For keyless entry, the BCM monitors input from the RKE transmitter (directly from the integrated keyhead transmitters (IKTs) on vehicles without push button start) or from the RFA module (on vehicles with push button start) to determine when to activate/deactivate the illuminated entry and exit functions.