Circuit Operation

Interior lighting is provided by the door guard lamps, footwell lamps, roof lamp (on coupe models only), trunk lamps, glove box lamp, vanity mirror lamps and map lamps. The Driver Door Control Module (DDCM), Passenger Door Control Module (PDCM) and Body Processor Module (BPM) operate the lamps in response to control inputs from related switches.

The door guard lamps, trunk lamps, glove box lamp and vanity mirror lamps operate automatically when their respective door/lid/cover opens or closes. To prevent battery drain from lamps being accidentally left on, when the ignition is off the door guard lamps go off after 5 ± 0.25 minutes if the door remains open; they remain on indefinitely when the ignition is at auxiliary or on. Similarly, after ignition off, the interior lighting supply to the trunk lamps, glove box lamp, vanity mirror lamps and map lamps is disabled approximately 15 minutes after the last detected SCP message (i.e. approximately 17 minutes after ignition off); the supply is restored immediately the next SCP message is detected, eg. when a door unlocks.

The two map lamps have individual switches for manual control. They also operate automatically, in conjunction with the footwell lamps and the roof lamp, to provide the cabin courtesy lighting. All three types of courtesy lamp fade up when they come on and fade down when they go off. When the engine is running, the lamps come on when a door opens, then go off immediately the last door closes. When the key is removed from the ignition switch, the lamps come on for 15 ± 1 second. When the engine is not running, the lamps (Dome on when a door opens, then go off:
- 15 ± 1 seconds after the last door closes
- after 2 ± 0.1 minutes if the door remains open when the door subsequently closes, they come on again for 15 ± 1 seconds)
- immediately, if the ignition switch is set to crank
- immediately the vehicle is locked, if the key is not in the ignition switch.

When the vehicle is unlocked the lamps come on at 75% brightness, then increase to maximum brightness when a door opens. If the doors remain closed after unlocking, the lamps go off after 2 ± 0.1 minutes.