Courtesy Lamp: Description and Operation

COURTESY/ILLUMINATED ENTRY LAMPS

The second group include lamps that may be manually turned on by placing the interior lamp switch in the on position, or by opening a door.
- Reading/Courtesy Lamps
- I/P Courtesy Lamps

The courtesy lamps, may be manually turned on by placing the interior lamp switch in the on position, or by opening a door. When the sunload sensor assembly indicates a low light condition, the following scenarios will occur. When a door is opened, the I/P courtesy, the overhead courtesy/reading and the ignition key cylinder lamps turn on. After all the doors have been closed the lamps will remain illuminated approximately 25 seconds after the last door closes. When the sunload sensor assembly indicates daylight conditions, the interior lamps will not illuminate at all.

The INT LP fuse in the fuse block - rear supplies battery positive voltage to the normally open switch contacts of the INT LP relay. The INT LP fuse also supplies battery positive voltage to the INT LP relay coil. The door modules communicate on a simple bus interface (SBI). When you open any door, the switch contacts of the door jamb close. When a door open switch signal is grounded, the door module sends a message to the drivers door module (DDM) in order to indicate that a door is open. The DDM sends a class 2 message to the rear integration module (RIM) in order to indicate which door is open. The RIM activates the INT LP relay in order to provide battery positive voltage to the interior courtesy lamps. When a door is opened, front or rear, the interior courtesy lamps illuminate. The RIM provides a pulse width modulated ground to all interior courtesy lamps for the interior lights theater dimming feature. Some of the courtesy lamps are also used as reading lamps, each reading lamp may be manually turned on or off using it's own respective switch.

The courtesy lamps will normally turn off using the theater dimming feature. The courtesy lamps will also turn off immediately if an all door lock command is received with all the doors closed, or if the ignition switch is turned to either the ON or RUN position.