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POWER DOOR AND FUEL-FILLER LID LOCK SYSTEM

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2016 – MX-5 – Body and Accessories

POWER DOOR AND FUEL-FILLER LID LOCK SYSTEM

Outline

  • When the door lock switch or the door key cylinder is operated to lock/unlock, all the doors and the fuel-filler lid lock/unlock.

Function

Door key interlock function

  • When the front door key cylinder is operated to lock/unlock, all the doors lock/unlock.

Door lock switch interlock function

  • When the door lock switch is operated to lock/unlock, all the doors lock/unlock.

2-step unlocking function

  • When an unlock operation is performed using the door key cylinder or remote transmitter, the driver-side door lock and fuel-filler lid unlock. In addition, when an unlock operation is performed, the door locks on all the doors unlock.

Collision detection unlock function

  • All doors unlock if the vehicle has a collision.

Auto door lock function

  • Doors lock/unlock according to the selector lever position (AT), vehicle speed, or ignition switch position. The auto door lock function settings can be changed using the personalization feature. For details on the personalization setting, refer to [SECURITY AND LOCKS PERSONALIZATION]. (See SECURITY AND LOCKS PERSONALIZATION.)

Structural View

System Wiring Diagram

Operation

Operation condition

  • When the door lock and link switch lock/unlock signal is detected while all the door latch switches and trunk lid latch switch off signals (all doors and trunk lid closed) are detected, the power door and fuel-filler lid lock system operates.

Lock operation using front door key cylinder

1. When the key is inserted in the front door key cylinder and a lock operation is performed, the door key cylinder switch switches to the lock side.

2. When the BCM detects a door key cylinder switch lock signal (1), it sends a door key cylinder switch lock signal (2) to the electrical supply unit (ESU) via LIN communication.

3. When the electrical supply unit (ESU) receives the door key cylinder switch lock signal, it turns the transistor on (3) and the door lock relay on (4).

4. When the door lock relay turns on, the door lock actuator and fuel-filler lid lock actuator motors perform a lock operation (5), and the door and fuel-filler lid lock.

Lock operation using door lock switch

1. When the door lock switch is operated to lock, the door lock switch switches to the lock side.

2. When the BCM detects the door lock switch lock signal (1), it sends the door lock switch lock signal (2) to the electrical supply unit (ESU) via LIN communication.

3. When the electrical supply unit (ESU) receives the door lock switch lock signal, it turns the transistor on (3) and the door lock relay on (4).

4. When the door lock relay turns on, the door lock actuator and fuel-filler lid lock actuator motors perform a lock operation (5), and the doors and fuel-filler lid lock.

2-step unlocking function operation using door key cylinder
    Timing chart of 2-step unlocking function operation using door key cylinder

  • If the driver’s door key cylinder switch is held in the unlock position for approx. 1 s with all the doors locked, the 2-step unlocking function operates.

1. When the front door key cylinder is operated to unlock, the key cylinder switch switches to the unlock side.

2. When the BCM detects the key cylinder switch unlock signal (1), it sends the key cylinder switch unlock signal (2) to the electrical supply unit (ESU) via LIN communication.

3. When the electrical supply unit (ESU) receives the key cylinder switch unlock signal, it turns the transistor on (3) and the door unlock relay on (4).

4. When the door lock relay turns on, the door lock actuator and fuel-filler lid lock actuator motors perform an unlock operation (5), and the driver’s door and fuel-filler lid unlock.

5. When the BCM detects the key cylinder switch unlock signal (1) for approx. 1 s, it sends the key cylinder switch 2-step unlocking signal (6) to the electrical supply unit (ESU) via LIN communication.

6. When the electrical supply unit (ESU) receives the key cylinder switch 2-step unlocking signal, it turns the transistor on (7) and the 2-step unlocking relay on (8).

7. When the 2-step unlocking relay turns on, the door lock actuator motor performs an unlock operation (9), and the passenger’s door unlocks.

2-step unlocking function operation using remote transmitter
    Timing chart of 2-step unlocking function operation using remote transmitter

  • If the following condition is met with all the doors locked, the 2-step unlocking function operates.

    • The BCM receives an unlock signal by the remote transmitter operation, and within 3 s it receives another unlock signal by the remote transmitter operation.

1. When the unlock button of the remote transmitter is pressed, the remote transmitter sends (1) ID data to the key receiver.

2. The keyless receiver receives ID data and transmits (2) the data to the start stop unit.

3. The start stop unit verifies the ID data, and if the ID data matches, it sends (3) an unlock request signal to the BCM.

4. When the BCM receives the unlock request signal, it sends (4) an unlock signal to the electrical supply unit (ESU) via LIN communication.

5. When the electrical supply unit (ESU) receives the unlock signal, it operates (5) the door lock actuator and fuel-filler lid lock actuator motors to unlock the driver’s door and the fuel-filler lid.

6. The BCM flashes (6) each turn light two times.

7. When the BCM receives the unlock request signal within approx. 3 s after receiving the unlock request signal, it sends (7) a 2-step unlocking signal to the electrical supply unit (ESU) via LIN communication.

8. When the electrical supply unit (ESU) receives the 2-step unlocking signal, it operates (8) the door lock actuator motor to unlock the passenger door.

Collision detection unlock function operation

1. If the vehicle is involved in a collision, the SAS control module sends (1) a collision detection door unlock signal to the BCM via CAN communication and it sends (2) the signal to the electrical supply unit (ESU) via hard wire.

2. The BCM sends (3) the received collision detection door unlock signal to the electrical supply unit (ESU) via LIN communication.

3. The electrical supply unit (ESU) unlocks all the doors after approx. 6 s it received the collision detection door unlock signal (4).

NOTE:

  • The collision detection unlock function will operate even if only one of the signals is sent.

Auto door lock function
    Selector lever interlock door lock/unlock control (AT)

  • The doors lock when the selector lever is shifted to a position other than the P position with all the following conditions met.

    • Theft-deterrent system in operation stop-mode, initial mode, or stand-by preparatory mode

      (See THEFT-DETERRENT SYSTEM.)

    • Ignition switch ON (engine off or on) is detected

    • All door latch switch OFF (all doors closed condition) is detected

    • Vehicle is determined to be driven.

  • The doors unlock when the selector lever is shifted to the P position with all the following conditions met.

    • Theft-deterrent system in operation stop-mode, initial mode, or stand-by preparatory mode

      (See THEFT-DETERRENT SYSTEM.)

    • Ignition switch ON (engine off or on) is detected

    Vehicle speed interlock door lock control

  • The doors unlock when the vehicle speed of 20 km/h {12 mph} or more is detected with all the following conditions met.

    • Theft-deterrent system in operation stop-mode, initial mode, or stand-by preparatory mode

      (See THEFT-DETERRENT SYSTEM.)

    • Ignition switch ON (engine on) is detected

    • All door latch switch OFF (all doors closed condition) is detected

    IG interlock door unlock control

  • The doors unlock when the ignition is switched to ACC or OFF from ON (engine on) with all the following conditions met.

    • Theft-deterrent system in operation stop-mode, initial mode, or stand-by preparatory mode

      (See THEFT-DETERRENT SYSTEM.)

    • Doors locked by selector lever interlock door lock control or vehicle interlock door lock control

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