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Lighting Control Module

WARNING: This page is about a different car, the 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

This vehicle uses a lighting control module (LCM). The LCM is a microprocessor-based module that controls several vehicle subsystems, responds to electrical input signals from various switches, sensors, and external modules and is located on the LH side of the instrument panel. LCM subsystem functions include:

The LCM interfaces with the driver door module (DDM) via the standard corporate protocol (SCP) network for the illuminated entry feature.

The interior lamp is illuminated by pressing the individual interior lamp switch. The interior lamp is also illuminated by door ajar switches located in the door latches, when any door is opened. A theater lighting feature gradually increases or decreases the light intensity when switched by opening or closing a door.

The dome/map lamp combination are located on each side of the interior lamp. The map lamps are operated independently of the interior lamp by two switches located on the interior lamps.

The interior lamps are illuminated by holding the panel dim switch in the UP position until the dome lamps turn on. The interior lamp also illuminates when a door is opened and actuates the door ajar warning lamp switch in the door latch.

The front map lamps are powered by the demand lighting circuit and the interior lighting circuit.

The rear passenger reading lamps are incorporated into the rear seat assist handle and are located over the rear door openings. These lamps are illuminated through power supplied by the LCM demand lighting circuit.

Interior lamps (controlled by the LCM) are activated by using the dome lamp switch (instant ON/OFF response) or when a door is ajar. The following lamps illuminate for interior lighting:

Demand lighting includes lamps that are illuminated by the customer by directly actuating a switch. The front dome/map lamps are located in the overhead console. Each lamp is controlled by its own switch.

The following demand lamps are powered by the demand lighting output of the LCM:

Each lamp has a dedicated switch that closes to ground to illuminate the lamp.

The front map lamps are powered by either the demand lighting circuit or the interior lighting circuit, depending upon the position of the switch associated with each lamp. When the customer turns the front map lamp switch ON, the front map lamp is illuminated through power supplied by the LCM demand lighting circuit. If the customer moves the map lamp switch to the OFF position, the power from the LCM demand lighting circuit is interrupted and the lamp is reconnected to the interior lighting circuit.

The rear reading lamps are powered by either the interior lighting circuit or the demand lighting circuit.

The luggage compartment lamp is controlled by the trunk ajar switch, and is powered by the demand lighting output from the LCM, and is mounted near the center of the upper rear panel.

The glove compartment lamp system consists of a glove compartment lamp switch and wire and miniature bulb assembly. Opening the glove compartment door closes the switch which provides power to the glove compartment lamp switch and wire. The glove compartment lamp switch is grounded to the body sheet metal.

The vanity mirror lamp system consists of a switch and bulb assembly in the RH inside visor and the LH inside visor. Lifting the vanity mirror cover closes the vanity mirror lamp switch and provides power to the lamps.

The illuminated entry system is controlled by the LCM and provides interior lighting upon entry to the vehicle.

Interior lamps will be illuminated for 25 (+/-1) seconds which includes a theater lighting ramp-up time (0.5 seconds). This time interval does not include the theater lighting ramp-down time. Interior lamps will be turned off before the 25 (+/-1)-second time-out if the ignition switch is turned to the RUN or ACC position.

The illuminated entry system has the following additions to accommodate the remote entry system: pressing the unlock button on the remote transmitter will activate the illuminated entry system (with theater ramp-up). When the driver door module detects a button press, it sends a signal on the J1850 communication network activating the interior lamps. The lighting control module will turn off the lamps by sensing the all doors lock signal.

The battery saver feature prevents excessive drain from loads inadvertently left on. When the ignition switch is turned OFF, power is interrupted to the interior lamps and headlamps (after a 10-minute time-out) and the demand lamps (after a 30-minute time-out).

The battery saver has the following inputs:

The battery saver has the following outputs:

When the ignition switch is turned to OFF, the interior lamps interrupt timer, and demand lamps interrupt timer begin their time-out. The interrupt timer is a feature of the LCM. Power is available to the interior, head, and demand lamps during time-out. At the end of the 10 (+/-1)-minute time-out period, the lighting control module disables power to the headlamps and interior lamps. At the end of the 30-minute time-out period, the LCM disables power to the demand lamps for interior lamps if dome switch is causing the interior lamps to be on, then time-out is 30 minutes. Turning the ignition switch to ACC or RUN will terminate the battery saver feature by disabling the interrupt timers and reinstating power to the lamps.

A reset event will set the interior lamps interrupt timer to zero. The reset events for the interior lamps and the demand lamps interrupt timer are as follows:

When the panic button is pressed on a keyless entry transmitter, the panic alarm will override the interior lamps, demand lamps and headlamps battery saver functions for the necessary duration of the alarm.

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