Crown Victoria V8-4.6L VIN W (2000)
Courtesy Lamp: Description and Operation
System Description
The interior lighting can be separated into two distinct modes of operation, the courtesy lighting, and the demand lighting. The Lighting Control Module
(LCM) controls all of the interior lighting in the vehicle, in the following text.
The front dome lamps, rear reading lamps, and instrument panel courtesy lamps, can be illuminated either by opening any of the vehicle doors (courtesy
lamp function) or by depressing the headlamp switch (demand lamp function).
When any door is open, the door ajar switch grounds an input to the LCM which then sends power to the courtesy lamps. The voltage sent to the
courtesy lamps gradually increases from 0 volts to 12 volts within 500 ms (± 50 ms), to achieve the theater lighting effect. When the door(s) are closed
the door ajar switch(es) break(s) the ground to the LCM input which then gradually reduces the power from 12 volts to 0 volts within 5 seconds.(±.5
second).
When the headlamp switch is depressed it grounds an input the LCM which in turn sends 12 volts to the front dome lamps, rear reading lamps, and
instrument panel courtesy lamps. When the headlamp switch is depressed a second time, it breaks the ground to the LCM input which then ceases to send
power to the front dome lamps, rear reading lamps, and instrument panel courtesy lamps.
The front map lamps, rear reading lamps, glove compartment lamp, vanity mirror lamp, luggage compartment lamp, and engine compartment lamp,
(police and natural gas vehicles only) are provided with power by the LCM demand lighting output, and are illuminated when a dedicated switch closes,
completing the ground circuit for the appropriate lamp(s). As the LCM provides constant power to the demand lamps, there is no ramp up or ramp down
time, the illumination is instantaneous once the appropriate switch is closed.
When a door handle is lifted, or a keypad button is depressed, it grounds an input to the LCM which then illuminates the interior lighting using the
theater lighting feature. When the unlock button on a remote keyless entry transmitter is depressed, the DDM sends a pulse signal to the LCM which then
illuminates the interior lighting using the theater lighting feature. In either instance the interior lamps will extinguish after the time-out using the theater
lighting feature. If a lock button on the remote keyless entry transmitter is depressed, or the ignition is turned to the run or acc position, it will extinguish
the interior lamps prior to the end of the time-out.
The dark car feature is a special order option that offers deletion of the illuminated entry function on police vehicles.
Upon vehicle power-up, the LCM will monitor the dark car input signal for a ground condition of longer than two seconds. If the ground is present, no
interior lighting will be provided during entry or exit of the vehicle. The interior lighting will, however, still operate on demand whenever the dome lamp
switch is depressed.
A ground will be provided to the LCM by an on-line connector within the unique police 14401 instrument panel harness. The male terminal side
connector will be retained on a portable clip and the female terminal connector will be tear-taped to a bundle. If the dark car feature is required, the
connection will be made on the assembly line. If no connection is made the default state of the LCM will be to provide illuminated entry.
The vehicle can be reconfigured by removing the power to the module, changing the dark car input from (or to) a ground or an open circuit, and then
reapplying power to the module. The vehicle can also be reconfigured by changing the dark car input signal from (or to) a ground or an open circuit,
entering diagnostics, and then exiting diagnostics.
The battery saver will disrupt power to the courtesy lamps after 10 minutes, the demand lamps after 30 minutes, and the headlamps after 10 minutes.
Turning the ignition switch to the run or acc position will terminate the battery saver feature by disabling the interrupt timers and reinstate power to the
lamps.
A reset event will set the courtesy lamps interrupt timer to zero. The reset events for the courtesy lamps interrupt timer are; turning on the courtesy lamps
by using the dome lamp switch, opening any door (as detected by the door ajar switches).
A reset event will set the demand lamps interrupt timer to zero. The reset events for the demand lamps interrupt timer are; opening the luggage
compartment door, opening any door (as detected by the door ajar switches)
When the panic button on a keyless entry remote transmitter is pressed, or an anti-theft system violation occurs, the panic alarm or anti-theft alarm
function will override the courtesy lamps, demand lamps and headlamps battery saver functions for the duration of the alarm.
