Keyless Entry Interior Illumination

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

When the remote control door lock receiver module (RCDLR) receives a door unlock command from the remote function actuator transmitter, the RCDLR will send a class 2 message to the rear integration module (RIM) indicating that an UNLOCK command has been received. The RIM must have inputs that indicate that the ignition switch is OFF, all the doors are closed, and the ambient light sensor is indicating low light conditions. The RIM will then activate the interior lamp relay, providing battery positive voltage and also a pulse width modulated (PWM) ground to the interior lamps. The RIM will keep the courtesy lamps on approximately 40 seconds and then turn them off through the theater dimming feature. If the door locks are activated to the LOCK position, or if the ignition switch is turned to either the ON or RUN position the courtesy lamps will deactivate immediately. When the ambient light sensor indicates daylight conditions, the interior courtesy lamps will not illuminate at all.