Ford Fusion: Handles, Locks, Latches and Entry Systems / Handles, Locks, Latches and Entry Systems - System Operation and Component Description. Description and Operation

System Operation

System Diagram

Network Message Chart

  BCM Network Input Messages

  PCM Network Input Messages

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 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 respective front door lock control switch. 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 the PDM detects a lock or unlock request, a message is sent over the CAN to the BCM to lock or unlock the doors.

If equipped, the BCM sends a voltage signal to the rear door lock control switches. When a door lock control switch is pressed, the voltage signal is routed to ground, indicating a request to lock 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, the passive entry system 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 also 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 powered, they illuminate to indicate a door is locked and are off when a door is unlocked.

The Light Emitting Diodes (LEDs) are powered continuously if the ignition is on, and when the battery saver feature has not activated if the ignition is off.

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

The lock/unlock feedback switch 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).

Switch Inhibit Feature

The switch inhibit feature prevents unauthorized access to the vehicle from the door lock control switches or the luggage compartment lid release switch. The BCM disables the function of both door lock control switches and the interior luggage compartment lid 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.

If equipped with factory remote start, there is also feedback provided by the vehicle and the key. For additional information regarding the remote start feedback, refer to the Owner's Literature.

Fuel Filler Door Release (hybrid vehicles)

The BCM sends a voltage signal to the fuel filler door release switch. When the switch is pressed, the signal is routed to ground, indicating a request to release the fuel filler door latch.

When the BCM detects the fuel filler door release switch is pressed, it sends a message to the PCM over the CAN to release the fuel filler door latch. The PCM checks the fuel tank for excessive fuel vapor pressure. If excess fuel tank vapor pressure is detected, the PCM activates a pump to remove the excess pressure.

When the PCM detects the excess pressure is removed, it provides a ground for the fuel filler door release relay, energizing the relay. The relay provides voltage to activate the fuel filler door release solenoid, releasing the fuel filler door latch. The process to release the fuel filler door can take as long as 15 seconds.

In the event the electronic fuel filler door release system fails, the fuel filler door latch can be released manually using the manual fuel filler door release cable. The manual fuel filler door release cable is located in the luggage compartment.

Fuel Filler Door Lock (if equipped - except hybrid vehicles)

The fuel filler door lock operates in conjunction with the power driver door lock. When the driver door is power locked/unlocked, the fuel filler door is also power locked/unlocked.

Luggage Compartment Lid Release

The luggage compartment lid can be released using:

• the interior luggage compartment lid release switch.
• the exterior luggage compartment lid release switch.
• a valid programmed RKE transmitter.
• a valid programmed passive key.

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

When using the luggage compartment lid release switches, the BCM releases the luggage compartment lid only when the doors are unlocked and the vehicle is in PARK.

When using a valid programmed RKE transmitter, press the luggage compartment lid release button twice within 3 seconds to release the luggage compartment lid latch. The luggage compartment lid latch releases if the vehicle speed is 5 km/h (3.1 mph) or less.

The luggage compartment lid can also be released using the passive entry feature. Refer to Luggage Compartment Lid Passive Entry in this section.

Keyless Entry Keypad

The keyless entry keypad is integrated into the front door window moulding. The BCM sends voltage signals on 3 separate circuits to the keyless entry keypad. When an individual keypad button is touched, an individual or combination of the input circuits is routed to ground. Based on these inputs, the BCM determines which button was touched. When a valid code is received, the BCM locks/unlocks the doors.

When a keypad button is touched, the buttons illuminate. The keypad illumination turns off after 5 seconds have elapsed since the last button press. The keypad also illuminates any time the illuminated entry feature is active.

The keyless entry keypad can be used to:

• unlock the driver door.
• unlock all the doors.
• lock all the doors (except when the driver door is open).
• unlatch the luggage compartment lid.
• program/erase up to 5 user codes.

Locking the Doors with the Keyless Entry Keypad

It is not necessary to enter the factory set or personal code prior to locking all doors. To lock all doors, touch and hold the 7/8 and 9/0 buttons at the same time for approximately 0.5 second. The locking function is disabled when the driver door is open.

Unlocking the Doors with the Keyless Entry Keypad

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 touch the 3/4 button within 5 seconds. This feature can be changed to a 1-stage unlock so that all of the doors unlock when a valid code is entered.
Refer to: Staged Unlock Programming (501-14 Handles, Locks, Latches and Entry Systems, General Procedures).

Unlatching the Luggage Compartment Lid with the Keyless Entry Keypad

Enter the factory set code or a personal code (driver door unlocks) and then touch the 5/6 button within 5 seconds.

Anti-Scan Feature

To provide added security, the keypad is disabled for 1 minute after 36 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, a passive entry feature is used, or the ignition is turned on.

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 valid programmed keys.

To retrieve the factory keycode using 2 programmed keys:

• Place the first valid programmed key in the backup starting location and turn the ignition on.
• Turn the ignition off and remove the first key.
• Place the second valid programmed key in the backup starting location and turn the ignition on.

The factory keycode displays momentarily in the message center.

RKE

The RKE feature is controlled by the BCM. When a button is pressed, the Transmitter Identification Code (TIC) and RKE command is received by the RTM. The RTM interprets the information and sends a message to the BCM over a LIN circuit and, when the network is awake over the CAN. If the BCM detects a valid programmed key, it carries out the command by controlling the door locks or activating the horn or turn signals as required.

The RKE system can be used to:

• unlock the driver door.
• unlock all doors.
• lock all doors.
• release the luggage compartment lid latch (luggage compartment lid release button must be pressed twice within 3 seconds).
• arm/disarm the perimeter alarm (if equipped).
• activate/deactivate the panic alarm.
• global open the windows (press the unlock button and then within 10 seconds press and hold the unlock button for 3 seconds) (if equipped).
• global close the windows (press and hold the lock button for 2 seconds) (if equipped).
• remotely start the vehicle (if equipped with the factory remote start system).
• configure the staged unlock programming (2-stage unlock or global unlock).

The RKE transmitters have a normal operating range of 30 m (98 ft) in an open air, no obstruction environment.

The RKE transmitters 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 RKE transmitter and the BCM every time a RKE transmitter button is pressed.

The message center displays Key Battery Low Replace Soon when the battery in the key needs to be replaced.

RKE Transmitter Unlock

The RKE feature provides a staged 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 (global unlock).
Refer to: Staged Unlock Programming (501-14 Handles, Locks, Latches and Entry Systems, General Procedures).

RKE Transmitter Lock

The RKE feature requests all of the doors lock when the lock button is pressed.

RKE Transmitter Luggage Compartment Lid Latch Release

The RKE transmitter provides a luggage compartment lid release function. The luggage compartment lid release button must be pressed twice within 3 seconds for the luggage compartment lid latch to release.

Panic Alarm

The panic alarm feature provides audible and visual alarms which are evident from the exterior of the vehicle. When the panic alarm button is initially pressed, the panic alarm feature requests that the turn signals flash and the horn sounds for up to 3 minutes or 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:

• a second press of the RKE transmitter panic button is detected.
• the ignition status changes from off.
• a period of 2 minutes and 45 seconds have elapsed since the initial activation.

The panic alarm cannot be deactivated during the first 5 seconds of activation to avoid unintentional deactivation.

Remote Start (if equipped)

The factory-installed remote start allows the vehicle to be remotely started from outside the vehicle. There is a 2- way communication between the key and the vehicle to provide the remote start status of the vehicle. The key contains a green and a red LED to indicate the remote start status.

  Remote Start LED Feedback

To remotely start the vehicle, the hood, the buttons on the RKE transmitter must be pressed within 3 seconds of each other. Press the lock button once and then the remote start button twice. The vehicle should remotely start and the LED on the key should be lit solid green.

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

• The feature is disabled using the message center.
• The hood is not closed.
• The vehicle is not in PARK.
• A powertrain system DTC is present, illuminating the service engine soon indicator.
• The ignition is on.
• The alarm system is triggered.
• The vehicle battery voltage is low.
• Two remote starts have already been attempted within the past hour.

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:

• All the doors are closed.
• The ignition is on.
• The vehicle is shifted into any gear to put the vehicle in motion.
• The vehicle attains a speed greater than 20 km/h (12.4 mph).

The autolock feature can be enabled/disabled if the setting is available in the message center settings. If the setting is not available in the message center settings, this feature cannot be disabled.

Auto-Unlock

NOTE: The doors do not auto-unlock if the vehicle has been electronically locked before the driver door is unlocked.

The auto-unlock feature unlocks all of the doors when all of the following conditions have been met:

• All the doors are closed and locked.
• The ignition was on.
• The vehicle was shifted out of park and a speed greater than 20 km/h (12.4 mph) was achieved.
• The vehicle has come to a stop.
• The ignition transitions to accessory or off and, within 10 minutes, the driver door is opened.

The auto-unlock feature can be enabled/disabled through the message center.

Smart Unlock

The smart unlock feature prevents the doors from electronically locking when a passive key is left inside the vehicle. When the doors are locked and then closed, the interior of the vehicle is scanned for a passive key. If a passive key is detected inside the vehicle when the doors are locked and closed, the doors unlock.

The smart unlock feature also operates to prevent locking a passive key inside the luggage compartment. When the luggage compartment lid is closed, the interior of the vehicle is scanned for a passive key. If a passive key is detected inside the luggage compartment when the luggage compartment lid is closed, the BCM releases the luggage compartment lid latch.

To override the smart unlock feature, lock the doors using the driver door lock cylinder, the keyless entry keypad or another valid programmed passive key.

Passive Entry

The passive entry feature unlocks or locks the doors or opens the luggage compartment lid without having to use a mechanical key blade or the RKE transmitter feature.

NOTE: The lock/unlock sensors may not detect a hand if thick gloves are worn.

When the BCM detects a lock or unlock sensor is touched on an exterior door handle, or the luggage compartment lid release button is pressed, it activates the low frequency antenna in the corresponding exterior door handle and inside the luggage compartment area. The low frequency antenna sends out a signal to the passive key. The low frequency signal activates the passive key and the passive key sends a high frequency signal back to the RTM. The RTM interprets the high frequency signal from the passive key and sends the information to the BCM. If the BCM detects a valid programmed passive key, the BCM either unlocks the driver door, unlocks or locks all 4 doors, or releases the luggage compartment lid latch.

Door Passive Entry

With a valid programmed passive key within 1 m (3.28 ft) outside a door, touch the lock or unlock sensor on the exterior door handle. The doors lock or unlock depending upon which sensor was touched on the handle. The unlock sensor is located on the inside of the handle and the lock sensor is located on the outside top face of the handle.

The driver front door passive entry feature either unlocks the driver door (if 2-staged unlock is enabled) or all four doors (if 2-staged unlock is disabled). The passive entry feature always locks all four doors when the lock sensor is touched for a half second.

The remaining doors passive entry feature always locks or unlocks all four doors.

Luggage Compartment Passive Entry

With a valid programmed passive key within 1 m (3.28 ft) outside the luggage compartment lid, press the luggage compartment lid release button on the rear of the vehicle to release the luggage compartment lid.

Component Description

Door Lock Control Switches

The front door lock control switches are double pole switches. The DDM and PDM supply the voltage signals for the lock and unlock requests. When a switch is pressed to lock or unlock, the corresponding input circuit is routed to ground, indicating a request to lock or unlock the doors.

The rear door lock control switches are single pole switches. The BCM supplies a voltage signal for the lock request. When a switch is pressed, the input circuit is routed to ground, indicating a request to lock the doors.

Door Latches

The door latches are sealed units and contain the door lock actuator, lock/unlock feedback switch, and the door ajar switch. The door lock actuators operate in 2 directions, depending on the polarity of the voltage. The door latches can be lubricated, if needed.

Interior Luggage Compartment Lid Release Switch

The interior luggage compartment lid release switch is a momentary contact switch that supplies a ground signal to the BCM. When the interior luggage compartment lid release switch is pressed the signal is routed to ground, indicating a request to the BCM to release the luggage compartment lid latch.

Exterior Luggage Compartment Lid Release Switch

The exterior luggage compartment lid release switch is a momentary contact switch that supplies a ground signal to the BCM. When the exterior luggage compartment lid release switch is pressed the signal is routed to ground, indicating a request to the BCM to release the luggage compartment lid latch.

Luggage Compartment Lid Latch

The luggage compartment lid latch contains the luggage compartment lid latch release motor and the luggage compartment lid ajar switch. The luggage compartment lid latch release motor is momentarily supplied voltage by the BCM when a valid request to open the luggage compartment lid is detected.

Keyless Entry Keypad

The keyless entry keypad is a touch-sensitive capacitive sensor integrated into the front door window moulding. When a finger touches the keypad, it changes the capacitance of the sensor in the area of the finger touch. The keypad determines which area is touched and provides a ground signal to the corresponding voltage reference circuit(s). The keypad only works when touched with a finger. The keyless entry keypad may not work when gloves are worn. The gloves act as an insulator and do not allow the finger to change the sensor capacitance.

Fuel Filler Door Release Switch (hybrid vehicles)

The fuel filler door release switch is a single pole switch. It is supplied a voltage signal from the BCM for the fuel filler door release request. When the switch is pressed to release the fuel filler door, the input is routed to ground, indicating a request to release the fuel filler door latch.

Fuel Filler Door Release Solenoid (hybrid vehicles)

The fuel filler door release solenoid activates when the PCM energizes the fuel filler door release relay. When the fuel filler door release solenoid activates, it releases the fuel filler door latch. The process to release the fuel filler door can take as long as 15 seconds.

Fuel Filler Door Ajar Switch (hybrid vehicles)

The PCM monitors the fuel filler door ajar switch and if it detects a fault with the fuel filler release system sends messages to the IPC to indicate a fault is detected.

The fuel filler door ajar switch is part of the body exterior's fuel filler door assembly.

Fuel Filler Door Lock (except hybrid vehicles)

The fuel filler door lock activates in conjunction with the driver front door. When the driver front is electronically locked or unlocked, the fuel filler door also locks or unlocks.

Passive Key

The passive key incorporates both the PATS functions and the RKE transmitter functions in a single device.

During key programming procedures, the PATS and RKE transmitter Identification (ID) of a passive key are both programmed. A maximum of 4 passive keys can be programmed.

In the event the passive key battery fails:

• a key blade within the passive key can be used to unlock the door manually.
• the passive key must be placed in the backup starting location to start the vehicle.

Exterior Door Handles

The exterior door handles contain a keyless entry antenna and capacitive touch sensor(s). The antennas and lock/unlock sensors are wired to the BCM. When activated, the antenna transmits a low frequency signal to activate a passive key.

The rear door handles are equipped only with capacitive touch sensors, not with antennas.

Keyless Entry Rear Antenna

NOTE: For information on the center PATS antenna, refer to section 419-01C.

The keyless entry rear antenna is monitored by the BCM. When activated, it transmits a low frequency signal to activate a passive key.

DDM or PDM

The DDM and the PDM monitor the door lock control switches and control the operation of the power windows and the power mirrors. They communicate with each other and the BCM over the CAN. They also send commands and receive feedback over a LIN for each rear door module.

The DDM and PDM require PMI when replaced.

RDM

Each RDM controls the operation of the power windows in the rear doors. They receive commands and send feedback with the corresponding DDM or PDM over a LIN for each module.

The RDM does not require PMI when replaced.

RTM

The RTM communicates all RKE and passive key information to the BCM over a LIN circuit and (when the network is awake) the CAN. The RTM is a receiving antenna that receives the high frequency signals from the passive keys.

The RTM requires PMI when replaced.

BCM

The BCM is the master module in control of the power door lock system. It is responsible for locking/unlocking the doors and releasing the luggage compartment lid. The BCM receives inputs for the door lock control switches, passive keys and RKE commands over the CAN.

The BCM requires PMI when replaced. Additionally, carry out the parameter reset procedure and program at least 2 keys.