Interior Lighting System: Other Lincoln MKT I

Courtesy Lamps

The courtesy lamps are controlled by the SJB. The courtesy lamp subsystem consists of the door ajar switches (integrated into the door latches), the LTM, the interior dome lamps, the footwell lamps, the RFA module, the instrument panel dimmer switch and the puddle lamps.

Illuminated Entry

The illuminated entry requests the dimmable backlighting, the parking lamps, the ambient lighting and the courtesy lamps to illuminate when the ignition is OFF and a door is opened, the Remote Keyless Entry (RKE) transmitter UNLOCK button is pressed, or the vehicle is unlocked using the keyless entry keypad or driver door lock cylinder. If no doors are open, the illuminated entry requests the lamps off after 25 seconds have elapsed, the ignition is switched out of OFF, switched ON, the RKE transmitter LOCK button is pressed, or the vehicle is locked using the keyless entry keypad.

Interior Lighting Delay

The interior lighting delay feature provides temporary illumination of the dimmable backlighting, the parking lamps, and the courtesy lamps after the doors are opened and then closed. The interior lighting delay feature keeps the lamps on for a period of 25 seconds after all the doors or the liftgate are closed. If during the 25-second delay time the SJB detects that the ignition has been switched out of OFF, switched ON, or if the vehicle is locked using the RKE transmitter or the keyless entry keypad, the lamp illumination is discontinued.

Illuminated Exit

The illuminated exit requests the dimmable backlighting, the parking lamps, and the courtesy lamps (except the puddle lamps) to illuminate for 25 seconds after all doors are closed and the ignition is turned OFF. The illuminated exit deactivates when the ignition is changed from OFF, turned ON, a door or liftgate becomes ajar, or 25-seconds have elapsed.

Theater Lighting

The theater lighting feature ramps-up the courtesy lamps over 0.7 second when courtesy lamp activation is requested. The theater lighting feature ramps-down the courtesy lamps over 1.7 seconds when interior lighting deactivation is requested by any feature other than the panic alarm or battery saver.

Demand Lamps

The demand lamps are controlled by the SJB via the battery saver relay. The demand lamps subsystem consists of the map/reading lamps and the vanity mirror lamps located in the visors. The SJB energizes the battery saver relay to supply voltage to the demand lamps.

Ambient Lighting

The ambient lighting system consists of the ambient lighting select switch, the ambient lighting dimmer switch, the ILCM, and the harnesses with hardwired LEDs located within the front and rear footwells, the floor console cup holders, the inside door handles, the map pockets, the floor console storage tray and the storage bin.

There are 4 different color LEDs (red, blue, green, and white) housed within each LED assembly. By illuminating various color combinations, the LEDs are able to produce 5 different colors of ambient light.

With each press of the ambient lighting select switch, the ILCM cycles through a different color variation or turns the ambient lighting feature off. With each press of the ambient lighting dimmer switch, the ILCM changes the brightness setting of the ambient lighting. The module retains the last color setting and brightness between uses.

When the illuminated entry feature is active, the ambient lighting defaults to a pre-set color (white) and brightness setting. When all the doors are closed and the illuminated entry is no longer active, the ambient lighting returns to the last color and brightness setting that was set by the operator.

The color and brightness settings can only be changed when the ignition is in RUN state, the parking lamps are on, and all the doors are closed.

Battery Saver

Note. Time-out is 1 minute if the vehicle has less than 80 km (50 miles).

The SJB provides automatic shut-off of the demand lamps and courtesy lamps after a time-out period in order to save battery voltage. A timer in the SJB is started when the ignition is turned OFF, and all the doors, and the liftgate is closed. When 10 minutes have elapsed, the voltage is automatically shut off to the lamps by the SJB. While the SJB has voltage disabled, if the ignition state is changed to any position other than OFF, any door or the liftgate becomes ajar, the UNLOCK button of the Integrated Keyhead Transmitter (IKT) transmitter is pressed, a valid keypad code is entered, an unlock request from the door lock cylinder is received, or the instrument panel dimmer switch is pressed, the SJB restores voltage and starts the timer again.

Interior Lamp Arbitrator

The SJB chooses between the interior lighting, interior mode, interior lighting delay, illuminated entry, illuminated exit and battery saver to determine which feature has precedence of activating and deactivating the interior lamps.

The Interior Lighting Control Module (ILCM) monitors the ambient lighting switch, the ambient lighting dimmer switch and messages (such as courtesy lamp door ajar status, illuminated entry status, accessory delay status, courtesy lamp delay status, battery saver relay status and ignition state) received from the Medium Speed Controller Area Network (MS-CAN). The ILCM uses these inputs to cycle the ambient lighting color, ambient lighting brightness and to turn the ambient lighting on or off.

Based on these inputs, the ILCM determines when the ambient lighting is turned on to the pre-set color and brightness setting or to customer selected color and brightness setting. The color and brightness setting can only be changed when the ignition is in RUN, the parking lamps are on and all the doors are closed.

Field-Effect Transistor (FET) Protection

Field-Effect Transistor (FET) is a type of transistor that when used with module software can be used to monitor and control current flow on module outputs. The FET protection strategy is used to prevent module damage in the event of excessive current flow.

The SJB utilizes an FET protective circuit strategy for many of its outputs (for example, a headlamp output circuit). Output loads (current level) are monitored for excessive current (typically short circuits) and are shut down (turns off the voltage or ground provided by the module) when a fault event is detected. A continuous DTC is stored at the fault event and a cumulative counter is started.

When the demand for the output is no longer present, the module resets the FET circuit protection to allow the circuit to function. The next time the driver requests a circuit to activate that has been shut down by a previous short (FET protection) and the circuit remains shorted, the FET protection shuts off the circuit again and the cumulative counter advances.

When the excessive circuit load occurs often enough, the module shuts down the output until a repair procedure is carried out. Each FET protected circuit has 3 predefined levels of short circuit tolerance based on the harmful effect of each circuit fault on the FET and the ability of the FET to withstand it. A module lifetime level of fault events is established based upon the durability of the FET. If the total tolerance level is determined to be 600 fault events, the 3 predefined levels would be 200, 400 and 600 fault events.

When each tolerance level is reached, the continuous DTC that was stored on the first failure cannot be cleared by a command to clear the continuous DTCs. The module does not allow this code to be cleared or the circuit restored to normal operation until a successful self-test proves that the fault has been repaired. After the self-test has successfully completed (no on-demand DTCs present), DTC B106E and the associated continuous DTC (the DTC related to the shorted circuit) automatically clears and the circuit function returns.

When the first or second level is reached, the continuous DTC (associated with the short circuit) sets along with DTC B106E. These DTCs can be cleared using the module on-demand self-test, then the Clear DTC operation on the scan tool (if the on-demand test shows the fault corrected). The module never resets the fault event counter to zero and continues to advance the fault event counter as short circuit fault events occur.

If the number of short circuit fault events reach the third level, then DTCs B106F and B1342 set along with the associated continuous DTC. This DTC cannot be cleared and the module must be replaced.

The SJB FET protected output circuits for the interior lighting system are the puddle lamp and courtesy lamp output circuits.

Front Interior Lamp

Note. Overhead console with roof opening panel shown, other consoles similar.

Scheme 36

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Scheme 37

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