Lincoln Corsair: Handles, Locks, Latches and Entry Systems / Description and Operation - Handles, Locks, Latches and Entry Systems - System Operation and Component Description

System Operation

System Diagrams

NOTE: The Phone As A Key feature can also be used to lock/unlock the vehicle. Refer to section 419-01C for information regarding this feature.

Network Message Chart

  BCM Network Input Messages

  IPC Module Network Input Messages

Electronic Door Locks

The BCM controls the door locks using a series of integrated relays (driver door and fuel 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.

The BCM is the master module that controls the door locks. The commands are used for:

• Driver door and fuel door unlock
• Passenger doors unlock
• All doors lock

When the BCM receives a valid lock or unlock request, it energizes the appropriate relay(s) to provide a voltage signal to the door latch control modules to either lock or unlock the door

Each door latch control module also monitors the lock and unlock request signals from the corresponding door lock control switch.

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 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 LED s are powered continuously if the ignition is on, or for 5 minutes after a lock request if the ignition is off.

The LED door lock indicators brightness level works in conjunction with the backlighting brightness level setting.

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 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. The BCM disables the function of both door lock control switches 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.

The BCM also sends a switch inhibit message to the DDM / PDM and the RGTM over the network.

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 (if equipped). This feature can be configured on/off through the message center.

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.

Power Liftgate

For power liftgate information,
Refer to: Body Closures - System Operation and Component Description (501-03 Body Closures, Description and Operation).

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 is 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 and fuel filler door.
• unlock all the doors.
• lock all the doors (except when the driver door is open).
• 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

NOTE: Vehicles equipped with passive entry come from the factory set with the 2-stage unlock feature disabled (all doors unlock when the factory keycode is entered).

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.

If the 2-stage unlock is enabled, enter the factory set code or a personal code (driver door unlocks) and then touch the 3/4 button within 5 seconds to unlock all doors. This feature can be changed to a 1-stage unlock through the message center.

Anti-Scan Feature

To provide added security, the keypad is disabled for 1 minute after wrong entry code being entered seven times. 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 , a wallet card in the Owner's Literature, using a diagnostic scan tool, or by using 2 programmed keys.

To retrieve the factory keycode using 2 programmed keys, carry out the following steps within 10 seconds:

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

NOTE: Warning messages display in the message center prior to the keycode being displayed.

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 programmed key, it carries out the command by controlling the door locks, releasing the liftgate latch (or sending a message to the RGTM to open the liftgate) or activating the horn or turn signals as required.

The RKE system can be used to:

• unlock the driver door and fuel filler door.
• unlock all doors.
• lock all doors.
• open the liftgate (liftgate release button must be pressed twice within 3 seconds).
• arm/disarm the perimeter alarm.
• activate/deactivate the panic alarm.
• global open the windows (press the unlock and then within 10 seconds press and hold the unlock button for 3 seconds) (if equipped).
• remotely start the vehicle.
• configure the staged lock 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 passive key (if equipped) needs to be replaced.

RKE Transmitter Unlock

The RKE provides a staged process for unlocking the doors. Upon receipt of the first request for unlocking the doors, the RKE feature unlocks only the driver door. If another unlock request is received within 3 seconds of the first, all the doors are unlocked. This feature can be disabled through the message center so that all the doors unlock on the first press of the unlock button (global unlock) through.

Vehicles come from the factory set with the 2-stage unlock feature disabled (single press unlocks all doors).

RKE Transmitter Lock

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

RKE Transmitter Liftgate Power Open

The RKE transmitter provides a liftgate power open function. To open the power liftgate, press the liftgate button twice within 3 seconds.

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 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.

Remote Start

The factory-installed remote start allows the vehicle to be remotely started from outside the vehicle. The passive key contains a green and a red LED to indicate the remote start status.

To remotely start the vehicle, press the lock button once and the remote start button twice within 3 seconds of each other. The vehicle should remotely start and the LED on the passive key should be lit solid green.

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

• The remote start enable/disable feature is in the Sync screen.
• 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.

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 activates again during the same ignition cycle when all of the following have occurred:

• The vehicle speed is reduced to less than 15 km/h (9.3 mph).
• A door is opened and then closed.
• The vehicle attains a speed greater than 20 km/h (12.4 mph).

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

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 vehicle from electronically locking when a passive key is left inside the vehicle. When the doors are electronically locked while a door is ajar and then closed, the interior of the vehicle is scanned for a passive key. If a valid programmed passive key is detected inside the vehicle, the BCM unlocks the doors and chirps the horn twice.

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

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

Fuel Filler Door Release (if equipped - hybrid vehicles)

The PCM sends a voltage signal to the fuel filler door release solenoid. When the button is pressed, the signal is routed to a return circuit, indicating a request to release the fuel filler door latch.

When the PCM detects the driver front door lock switch is pressed, it 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 voltage and ground to 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 lever.

Passive Entry

NOTE: To perform an accurate diagnosis of a concern, make sure the vehicle has a fully charged 12V battery and is in good condition when performing any electrical pinpoint tests. When the vehicle’s 12-volt battery is below a set threshold, certain features can be limited or become inoperative and lead to misdiagnosis.

Doors

With a programmed passive key within 1 m (3.28 ft) outside a door, touch the lock sensor at the bottom of the front door window moulding or activate the exterior door latch release switch. The doors lock or unlock and unlatch depending upon which input the BCM receives.

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

Liftgate

With a programmed passive key within 1 m (3.28 ft) outside the liftgate, press the liftgate button on the rear of the vehicle to power open the liftgate.

Door Passive Entry

The passive entry door lock touch sensors (located at the bottom of each front door window moulding) is provided voltage by the BCM at all times. The sensor and the integrated lock LED is monitored and controlled by the respective front door control module. When the front door control module detects the lock sensor is touched, the door lock control module sends a passive entry lock request through a circuit monitored by the BCM .

When the BCM detects a passive entry lock request, it activates the PATS exterior front door handle antennas. The keyless entry door antenna sends out a low frequency signal to the passive key. The low frequency signal activates the passive key and the passive key sends a high frequency signal to the RTM . The RTM interprets the high frequency signal from the passive key and sends the key information to the BCM . If the BCM detects a valid programmed passive key, the BCM commands all the doors to lock.

The passive entry lock feature does not activate if the doors are in lock mode.

The passive entry door lock touch sensors are integrated into the front door upper window mouldings.

Liftgate Passive Entry

When the BCM is in lock mode and the liftgate button is pressed or the liftgate hands-free request is detected, it activates the keyless rear entry antenna inside the cargo area. The rear keyless antenna sends out a low frequency signal to the passive key. The low frequency signal activates the passive key and the passive key sends a high frequency signal 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 sends a request to the RGTM to power open the liftgate.

Approach Detection

When the approach detection feature is active, the BCM uses the PATS exterior front door handle antennas and the PATS front antenna to detect a valid programmed passive key when approaching within 1.5 m (5 ft) from the front of the vehicle and 2.7 m (8.5 ft) from the sides and rear of the vehicle. After 10 approach detection events without an unlock action, the feature is disabled. When the BCM detects a valid programmed passive key, the illuminated entry feature activates.

Component Description

Door Lock Control Switches

The DDM and PDM provide voltage signals to the door lock control switch for the lock and unlock requests. When a lock or unlock button is pressed, the corresponding input circuit is routed to ground, indicating a request to lock or unlock the doors.

The BCM provides voltage signals to the corresponding rear door lock control switch 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.

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.

Fuel Filler Door Release Solenoid (hybrid vehicles)

The fuel filler door ajar switch is integrated into the fuel filler door release solenoid. 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.

Fuel Filler Door Lock

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

Keyless Entry Keypads

The keyless entry keypads are touch-sensitive capacitive sensors 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 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.

The passive entry door lock touch sensors are integrated into the front door upper window mouldings and not replaced separately.

Passive Key

The passive key incorporates both the PATS and 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 unlatch the door manually.
• the passive key must be placed in the backup starting location to start the vehicle.

PATS Exterior Front Door Handle Antennas

The PATS exterior front door handle antennas are activated by the BCM . When activated, they transmit a low frequency signal to activate a passive key.

Keyless Entry Rear Antenna

The keyless entry rear antenna is activated 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 .

The DDM and PDM require PMI when replaced.

RTM

The RTM communicates all RKE and passive key information to the BCM over a LIN -based circuit whether or not the CAN is active. The RTM is a receiving antenna that receives the high frequency signals from 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. 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.