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Home >> Lincoln >> 2018 >> MKZ Select, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 600 (Handles, Locks, Latches And Entry Systems) >> Description And Operation >> Handles, Locks, Latches and Entry Systems - Without Intelligent Access (IA) >> System Operation >> Operation

System Operation: Operation

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

Power Door Locks 

The BCM controls the door locks by using a series of relays (driver door unlock/passenger doors unlock/all doors lock) integrated within it. When the relays are not energized, ground is provided on both circuits to the door lock actuators. When an unlock relay energizes, voltage is provided to one side of the door lock actuator to unlock the door(s). When the lock relay energizes, the polarity is reversed and the door lock actuators lock the doors.

NOTE: The door lock and the unlock relays are internal to the BCM and are non-serviceable.

The BCM sends voltage signals to the left and right door lock control switches. When a door lock control switch is pressed, the voltage signal is routed to ground, indicating a request to lock/unlock the doors.

Based upon input from the door lock control switches, the RKE transmitter and the keyless entry keypad, the BCM energizes the lock all relay, the unlock driver door relay, or unlock all relay. When the all lock relay is energized, the BCM supplies voltage to the all door lock circuit and ground to the driver and passenger door unlock circuits. When the unlock driver door relay or unlock all relay is energized, the voltage and ground are reversed. When the lock and unlock relays are not energized, continuity to ground is supplied to all door lock actuator circuits. A dedicated BCM ground circuit is provided for the lock and unlock relays.

Liftgate Glass Latch Release 

The BCM sends a voltage signal to the liftgate glass release switch. When the liftgate glass release switch is pressed, the voltage signal is routed to ground, indicating a request to release the liftgate glass latch. The BCM momentarily provides voltage to the liftgate glass latch to actuate the release motor.

The BCM releases the liftgate glass latch only after electronically unlocking the doors first.

On vehicles equipped with a manual liftgate, the liftgate glass latch can be released using the RKE feature.

Liftgate Latch Release 

NOTE: Refer to Body Closures for information on the power liftgate.

The BCM sends a voltage signal to the liftgate release switch. When the liftgate release switch is pressed, the voltage signal is routed to ground, indicating a request to release the liftgate latch. The BCM momentarily provides voltage to the liftgate latch to actuate the release motor.

The BCM releases the liftgate latch only after electronically unlocking the doors first.

Keyless Entry Keypad 

The BCM sends voltage signals on 3 separate circuits to the keyless entry keypad. When an individual keypad button is pressed, an individual or combination of the input circuits is routed to ground. Based on these inputs, the BCM determines which button was pressed and locks/unlocks the door(s).

When a keypad button is pressed, the buttons illuminate to provide better visibility. The keypad also illuminates any time the illuminated entry feature is active. If the lock all doors command is entered or 5 seconds have elapsed since the last button press, the keypad illumination turns off.

The keyless entry keypad can be used to:

Vehicles equipped with a keypad are programmed with a 5-digit entry code. This code is provided to the customer through a wallet card in the Owner's Literature. In addition, this code is available through a scan tool and is printed on the BCM label. When entering codes, each digit must be entered within 5 seconds of the previous button press.

Locking the Doors with the Keyless Entry Keypad System 

It is not necessary to enter the factory set or personal code prior to locking all doors. To lock all doors, press the 7/8 and 9/0 buttons at the same time.

Unlocking the Doors with the Keyless Entry Keypad System 

To unlock the driver door, enter either the factory set code or a personal code (each digit must be pressed within 5 seconds of the prior digit). The illuminated entry feature activates unless disabled.

To unlock all doors, enter the factory set code or a personal code (driver door unlocks) and then press the 3/4 button within 5 seconds. This feature can be changed to a 1-step unlock so that all of the doors unlock when a valid code is entered. Refer to Stepped Unlock Programming .

NOTE: Vehicles without passive entry come from the factory with 2-step unlock enabled.

Anti-Scan Feature 

To provide added security, the keypad is disabled for 1 minute after 35 button presses without a valid entry code being entered. The keypad flashes during this 1 minute mode with all functionality disabled except for 7/8 and 9/0 still being allowed to lock the vehicle.

Anti-scan turns off after 1 minute of keypad inactivity, the unlock button is pressed on a RKE transmitter, or the ignition mode is changed to RUN.

Factory Keycode Retrieval 

The factory keycode for the keyless entry keypad can be retrieved from a label on the BCM, using a diagnostic scan tool, or by using 2 programmed keys.

To retrieve the factory keycode using 2 programmed keys:

The factory keycode displays momentarily in the message center after any warning messages that may be present.

Remote Keyless Entry (RKE) 

The RKE system uses an IKT. The IKT incorporates both the Passive Anti-Theft System (PATS) and the RKE transmitter functions in a single device.

The IKTs can be used to:

The IKTs have a normal operating range of approximately 20 m (66 ft).

The RKE feature is controlled by the Radio Transceiver Module (RTM) and the BCM. When a button is pressed on a valid programmed IKT, the Transmitter Identification Code (TIC) and RKE command is received by the Radio Transceiver Module (RTM) antenna. If the Radio Transceiver Module (RTM) determines it is a valid and programmed TIC, it sends the RKE command and TIC to the BCM over the Medium Speed Controller Area Network (MS-CAN). When the BCM receives the RKE data, it carries out the command by activating the door locks, activating the horn or turn signals as required, or by remote starting the vehicle.

The IKTs and the BCM also utilize a rolling code to prevent the code from being captured by a code grabber. The system advances the counter in the IKT and the BCM every time an IKT button is pressed.

Remote Keyless Entry (RKE) Transmitter Unlock 

The RKE feature provides a stepped (if enabled) process for unlocking the doors. Upon receipt of the first request for unlocking the doors, the RKE control feature unlocks only the driver door and provides a long flash of the turn signals. If another unlock request is received within 3 seconds of the first, all the doors are unlocked. This feature can be disabled so that all the doors unlock on the first press of the unlock button. To enable/disable this feature, refer to Stepped Unlock Programming .

NOTE: Vehicles without passive entry come from the factory with 2-step unlock enabled.

Remote Keyless Entry (RKE) Transmitter Lock 

The RKE feature requests that all of the doors lock when the lock button is pressed. On any press of the lock button with all doors closed, the doors lock and the turn signals flash once. If the hood, the liftgate or any door is ajar, no flash occurs. As soon as the opening is closed, the turn signals flash.

If 2 presses of the lock button are received within 3 seconds, the horn chirps once and the turn signals flash twice to indicate the hood, the liftgate and all of the doors are closed and locked. If the hood, the liftgate or any door is ajar when the second lock request is received within 3 seconds of the first, the RKE transmitter feature chirps the horn twice without flashing the turn signals to indicate it locked all of the doors but the hood, the liftgate or a door is ajar. When the ignition is in RUN, the turn signal flashes and horn chirp confirmations do not occur.

Remote Keyless Entry (RKE) Transmitter Liftgate Glass Latch Release (manual liftgate) 

The IKT provides a liftgate glass latch release function. The liftgate button must be pressed twice within 3 seconds for the liftgate glass latch to release.

Remote Keyless Entry (RKE) Transmitter Power Liftgate Open and Close (power liftgate) 

The IKT provides a power liftgate open and close function. The liftgate button must be pressed twice within 3 seconds for the power liftgate to open or close.

Panic Alarm 

The panic alarm feature provides audible and visual alarms which are evident from the exterior of the vehicle. The panic alarm feature requests that the turn signals flash and the horn sounds until deactivation. The flashing of the outputs occurs simultaneously.

The panic alarm can only be activated when the ignition is OFF. This feature is disabled at all other times. Deactivation of an active panic alarm is accomplished when:

Remote Start (if equipped) 

Vehicles with the factory-installed remote start have an extended range to allow the vehicle to be remotely started from up to approximately 100 m (328 ft) away of the vehicle in an open air environment with no obstacles or environmental interference.

To remotely start the vehicle, the buttons on the IKT must be pressed within 3 seconds of each other. Press the lock button once and then the remote start button twice. The BCM acknowledges the remote start request by flashing the exterior lights twice, starting the vehicle (the horn sounds if the vehicle fails to start) and turning on the parking lamps.

The vehicle does not remote start if any of the following conditions are present:

For additional information regarding the remote start system, refer to the Owner's Literature.

Autolock 

The autolock feature locks all of the doors after all of the following have occurred:

The autolock feature repeats after all of the following have occurred:

The autolock feature can be enabled/disabled using the message center.

Auto-Unlock 

NOTE: The doors do not auto-unlock if the vehicle has been electronically locked before the driver door is opened while the ignition is in OFF or ACC.

The auto-unlock feature unlocks all of the doors after all of the following have occurred:

The auto-unlock feature can be enabled/disabled.

Smart Unlock 

The smart unlock feature prevents the doors from electronically locking with the key in the ignition lock cylinder. When the BCM receives a lock command from a door lock control switch, and the key is in the ignition lock cylinder with one of the front doors open, the BCM commands the doors to unlock.

To override the smart unlock feature and intentionally lock the doors with the key in the ignition lock cylinder, close all doors and lock the vehicle using the keyless entry keypad or pressing the lock button on another programmed IKT, or lock the doors manually with the lock rod before closing the door.

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