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Home >> Ford >> 2018 >> Mustang GT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 124 (Handles, Locks, Latches And Entry Systems) >> Description And Operation >> Handles, Locks, Latches and Entry Systems - System Operation and Component Description >> System Operation >> Power Door Locks

Power Door Locks

WARNING: This page is about a different car, the 2018 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

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

The DDM and PDM send voltage signals to the 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. When the DDM or PDM detects a lock or unlock request, a message is sent over the CAN to the BCM to lock or unlock the doors.

In the event of a power door lock failure, the doors can be individually locked through the manual door lock. The manual door lock is located on the rear edge of the door just above the door latch opening. For the doors on the left side of the vehicle, insert a key and turn clockwise to lock. For the doors on the right side of the vehicle, insert a key and turn counterclockwise to lock.

Based on input from the door lock control switches, the keyless entry keypad (if equipped), the passive entry system (if equipped) and the RKE transmitter, the BCM unlocks the driver door, unlocks all the doors or locks all the doors.

LED Door Lock Indicators 

Each door panel has a door lock indicator located on the window sill to indicate the lock or unlock status of that individual door. The door lock indicators are controlled by the lock/unlock feedback switch located within each door latch. When activated, they illuminate to indicate a door is locked and are off when a door is unlocked.

The Light Emitting Diodes (LEDs) are powered continuously when the ignition is on, or for 5 minutes after a lock request if the ignition is off.

The DDM and PDM provide voltage to their respective front door lock indicator and the BCM supplies voltage to the rear door lock indicators.

The lock/unlock feedback switch (within each door latch) provides a ground path to bypass the indicator. The switch is closed when the door is unlocked (indicator not illuminated) and open when locked (indicator illuminated).

The LED door lock indicators are part of the electrical harness and cannot be replaced independently.

Switch Inhibit Feature 

The switch inhibit feature prevents unauthorized access to the vehicle from the door lock control switches or the liftgate release switch. The BCM disables the function of both door lock control switches and the interior liftgate release switch 20 seconds after the vehicle is electronically locked. If any of these switches are activated while they are inhibited, a chime sounds and a message is displayed in the message center to indicate the switches are inhibited. The BCM enables the function of these switches when the vehicle is electronically unlocked.

This feature can be configured on/off through the message center.

Power Door Locking Feedback 

The exterior lamps and horn provide visual and audible feedback when unlocking and locking the doors under certain circumstances. Refer to the following table:

NOTE: The mislock feature (if equipped) sounds the horn twice (no turn signal flash) if the hood, liftgate or any door is ajar when the lock button is pressed on a valid programmed RKE transmitter. This feature can be configured on/off through the message center.
Action Status of Door(s) Status of Liftgate Status of Hood Visual/Audible Feedback
Press the lock button on the door lock control switch Open Closed Closed A short flash of the turn signals after all the doors are closed.
Press 7/8 and 9/0 on the keyless entry keypad Closed Closed Closed A short flash of the turn signals.
Press the unlock button on a RKE transmitter Closed Closed Closed A long flash of the turn signals.
Press the lock button on a RKE transmitter Closed Closed Closed A short flash of the turn signals.
Press the lock button on a RKE transmitter Open Closed Closed A short flash of the turn signals after all the doors are closed.
Press the lock button on a RKE transmitter Closed Open Closed A short flash of the turn signals after the liftgate is closed.
Press the lock button on a RKE transmitter Closed Closed Open A short flash of the turn signals after the hood is closed.
Press the lock button on a RKE transmitter twice within 3 seconds Closed Closed Closed The horn chirps twice and the turn signals flash twice.
Press the lock button on a RKE transmitter twice within 3 seconds Open Closed Closed The horn immediately chirps twice and the turn signals flash twice after all the doors are closed.
Press the lock button on a RKE transmitter twice within 3 seconds Closed Open Closed The horn immediately chirps twice and the turn signals flash twice after the liftgate is closed.
Press the lock button on a RKE transmitter twice within 3 seconds Closed Closed Open The horn immediately chirps twice and the turn signals flash twice after the hood is closed.

There is also feedback provided by the vehicle to the key for the remote start feature. For additional information regarding the remote start feedback, refer to the Owner's Literature.