Principles of Operation

WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

Vehicles equipped with remote keyless entry (RKE) have an illuminated entry feature, which enables the instrument cluster module (ICM) to illuminate the interior lamps (and if equipped, the puddle lamps in the exterior mirrors) when an unlock signal is received from the vehicle security module through the UBP network, or when any of the doors are opened. The ICM controls the interior lamps illuminated entry feature by activating the battery saver relay. When active, the illuminated entry feature will be canceled when any of the following conditions are met:

25 seconds have elapsed since the illuminated entry feature was activated and the interior lamp control is not activated (door ajar or interior lamp switch ON).
On vehicles equipped with RKE, the ICM received a request from the vehicle security module (remote transmitter lock button pressed) and the interior lamp control is not activated.
The ignition is in the RUN or START position and the interior lamp control is not activated.

For vehicles equipped with RKE, the ICM illuminates the interior lamps when any door is open. The interior lamps shut off when the doors are closed and the illuminated entry feature is not active or when the vehicle speed is greater than 15 kmh (6 mph). The interior lamps are not reactivated until the vehicle speed is less than 15 kmh (6 mph) and a new door open signal is received.

For vehicles without RKE, the ICM illuminates the interior lamps and puddle lamps (if equipped) when any door is open. The ICM will turn the interior lamps and puddle lamps (if equipped) OFF when the doors are closed.

Power to the on-demand lamps, illuminated vanity mirrors and map lamps are controlled by the battery saver relay.