Courtesy Lamp: Description and Operation

PRINCIPLES OF OPERATION

The instrument cluster illuminates the interior lamps when an unlock signal is received from the vehicle security module. 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 courtesy lamp switch on).
- The instrument cluster receives 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.

The instrument cluster will illuminate the interior lamps when any door is open or ajar. The courtesy lamps will shut off when the doors are closed and the illuminated entry feature is not active or when the vehicle speed is greater than 10 mph (15 km/h).

The panel dimmer/dome lamp switch is used to turn on or off the interior lamps by activating the instrument cluster through circuits 1034 (BK/WH) and 1404 (YE).

The interior lamps, underhood assembly, glove compartment assembly, homelink module and illuminated vanity mirrors are controlled by the battery saver relay. The battery saver relay becomes active (relay coil is energized) when the instrument cluster is in the awake mode. In the sleep mode the relay coil is de-energized.

The vehicle security module sends a signal to the instrument cluster on the universal asynchronous receiver-transmitter (UART-based protocol (UBP)) network circuit to indicate a request to turn the illuminated entry feature on or off.

The instrument cluster controls the illuminated entry function by supplying power to the courtesy lamp circuit.

The instrument cluster controls the demand lamps by activating the battery saver relay.

The relay is activated by applying ground to the relay coil, and is deactivated by removing the ground signal.