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ADVANCED KEYLESS ENTRY SYSTEM

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2016 – MX-5 – Body and Accessories

ADVANCED KEYLESS ENTRY SYSTEM

Outline

  • An advanced keyless entry system has been adopted which performs automatic authorization of the remote transmitter that the customer carries and locking/unlocking of the doors and fuel-filler lid.

Function

  • Remote transmitter authorization is performed if any of the following operations is performed.

    • Locking/unlocking using a request switch on an outer handle

    • Locking/unlocking using a remote transmitter

    • Trunk lid is opened using a remote transmitter

    • Trunk lid is opened

  • Each light flashes to notify the user that the lock/unlock operation is completed.

  • The advanced keyless entry system has the following functions in the event that the user operates the system incorrectly or to prevent the user from leaving the vehicle without locking.

    • Auto re-lock function: After unlocking, if all doors or the trunk lid are not opened and a period of time according to the personalized setting has elapsed, all doors and the fuel-filler lid are automatically locked.

    • Out-of-area (reception area) type auto lock function*: After closing all doors, when the remote transmitter is brought out of the reception area of the keyless antenna, all doors and the fuel-filler lid are automatically locked.

    • Remote transmitter suspend function: If all doors are locked with a remote transmitter left in the vehicle, the functions of the remote transmitter inside the vehicle are suspended.

    • Remote transmitter left-in-vehicle prevention function: If the trunk lid is closed with a remote transmitter left in the vehicle, the trunk lid can be opened by pressing the trunk lid opener switch.

    • Warning function: Warns using any of the following if there is a malfunction in the advanced keyless entry system or the system is operated incorrectly.

      • Keyless beeper

      • Keyless warning alarm

      • KEY warning light (red)

*
The initial value for the personalization setting is off. When using the function, turn the personalization setting on.

Remote transmitter battery voltage low indication function

  • This function notifies the driver that the battery voltage of the remote transmitter is low by flashing the KEY indicator light (green).

Structural View

System Wiring Diagram

Operation

Lock/unlock operation using a request switch
    Operation condition

  • When the request switch is on with all the following conditions met, lock/unlock operation is performed.

    • ACC relay and IG1 relay OFF (ignition switched OFF) detected

    • All door latch switch off signals (all doors closed) received

    • Remote transmitter is within exterior keyless antenna reception area

1. When the driver’s or passenger’s side request switch is pressed, a request switch on signal is input (1) to the start stop unit via the LF control unit.

2. Based on the request switch on signal, the start stop unit sends (2) a request output signal to the LF control unit to verify that the remote transmitter is inside the reception area.

3. The LF control unit outputs (3) the request signal from the outside keyless antenna of the door in which the request switch was pressed.

4. The remote transmitter receives the request signal from the outside keyless antenna, and sends (4) ID data to the keyless receiver.

5. The keyless receiver transmits (5) the received ID data to the start stop unit.

6. The start stop unit verifies the ID data, and if it determines a programmed remote transmitter is outside the vehicle, it sends (6) a lock/unlock request signal to the BCM and at the same time, it sends (7) a beeper sound request signal to the LF control unit.

7. When the BCM receives the lock/unlock request signal, it sends (8) a lock/unlock signal to the electrical supply unit (ESU) via LIN communication.

8. When the electrical supply unit (ESU) receives the lock/unlock signal, it operates (9) the door lock actuator and fuel-filler lid lock actuator motors to lock/unlock the doors and the fuel-filler lid.

NOTE:

  • It takes approx. 1???2 s from when a request switch is pressed until the lock/unlock operation is completed.

9. When the LF control unit receives the beeper sound request signal, it activates (10) the keyless beeper for the following number of times.

  • Lock: Activates beeper once

  • Unlock: Activates beeper twice

10. The BCM flashes (11) each turn light for the following number of times.

  • Lock: Flashes each turn light once

  • Unlock: Flashes each turn light twice

Lock/unlock operation using remote transmitter
    Operation condition

  • When door locking is performed

    • Lock operation is performed when the lock button of the remote transmitter is operated with all of the following conditions met.

      • ACC relay and IG1 relay OFF (ignition switched OFF) detected

      • All door latch switch off signals (all doors closed) received

  • When door unlocking is performed

    • When the unlock button of the remote transmitter is operated with the ACC relay and IG1 relay OFF (ignition switched OFF) detected, unlock operation is performed.

1. When the lock or unlock button of the remote transmitter is pressed, the remote transmitter sends (1) ID data.

2. When the keyless receiver receives ID data, it transmits (2) the data to the start stop unit.

3. The start stop unit verifies the ID data, and if the ID data match, it sends (3) a lock/unlock request signal to the BCM and at the same time, it sends (4) a beeper activation request signal to the LF control unit.

4. When the BCM receives the lock/unlock request signal, it sends (5) a lock/unlock signal to the electrical supply unit (ESU) via LIN communication.

5. When the electrical supply unit (ESU) receives the lock/unlock signal, it operates (6) the door lock actuator and fuel-filler lid lock actuator motors to lock/unlock the doors and the fuel-filler lid.

6. When the LF control unit receives the beeper sound request signal, it activates (7) the keyless beeper for the following number of times.

  • Lock: Activates beeper once

  • Unlock: Activates beeper twice

7. The BCM flashes (8) each turn light for the following number of times.

  • Lock: Flashes each turn light once

  • Unlock: Flashes each turn light twice

Trunk lid open operation using remote transmitter
    Operation condition

  • When the trunk lid open button of the remote transmitter is operated with the ACC relay and IG1 relay off (ignition switched OFF condition) detected, the trunk lid opens.

1. When the trunk lid open button is pressed for approx. 0.5 s, the remote transmitter sends (1) the ID data.

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) a trunk lid release request signal to the BCM.

4. When the BCM receives the trunk lid release request signal, it sends (4) a trunk lid release signal to the electrical supply unit (ESU) via LIN communication.

5. When the electrical supply unit (ESU) receives the trunk lid release signal, it operates (5) the trunk lid release actuator motor to open and opens the trunk lid.

Trunk lid open operation
    Operation condition

  • The trunk lid opens when the trunk lid opener switch is pressed with the remote transmitter in keyless antenna reception area outside of the vehicle.

1. When the trunk lid opener switch is turned on, the trunk lid opener signal is input (1) to the BCM.

2. The BCM sends (2) the trunk lid open signal to the start stop unit.

3. Based on the trunk lid open signal, the start stop unit sends (3) a request output signal to the LF control unit to verify that the remote transmitter is inside the reception area.

4. Based on the request output signal from the start stop unit, the LF control unit outputs (4) a request signal using the keyless antenna (exterior, rear) inside the rear bumper.

5. The remote transmitter receives the request signal from the antenna (exterior, rear), and sends (5) ID data to the keyless receiver.

6. The keyless receiver transmits (6) the received ID data to the start stop unit.

7. The start stop unit verifies the ID data, and if the ID data matches, it sends (7) a trunk lid release request signal to the BCM.

8. When the BCM receives the trunk lid release request signal, it sends (8) a trunk lid release signal to the electrical supply unit (ESU) via LIN communication.

9. When the electrical supply unit (ESU) receives the trunk lid release signal, it operates (9) the trunk lid release actuator motor to open and opens the trunk lid.

Auto re-lock function operation

  • After the start stop unit sends an unlock request signal to the BCM, if any of the following conditions is not met for 60 s*1, it sends a lock request signal to the BCM.

    • Any door latch switch or trunk lid latch switch on signal (any door or trunk lid open) received

    • Door lock-link switch lock (driver’s door locked) detected

    • ACC relay or IG1 relay ON (ignition switched to ACC or ON) detected

  • When the BCM receives a lock request signal, it sends a lock signal to the electrical supply unit (ESU) and locks the doors and the fuel-filler lid.

*1
Personalization setting time (See SECURITY AND LOCKS PERSONALIZATION.)

Out-of-area (reception area) type auto lock function operation

1. The start stop unit goes on auto lock stand-by and activates the keyless beeper once when all of the following conditions are met.

  • ACC relay and IG1 relay OFF (ignition switched OFF) detected

  • Door lock-link switch unlock (driver’s door unlocked) detected

  • Remote transmitter is not within keyless antenna reception area

  • Remote transmitter is within keyless antenna reception area outside of vehicle

  • Trunk lid latch switch off signal (trunk lid closed) received

  • All of door latch switch off signals (all doors closed) received from any of door latch switch on signal (any door open) received

2. After entering stand-by status, the start stop unit verifies that the remote transmitter is within the keyless antenna reception area. When the remote transmitter is moved out of the keyless antenna reception area or approx. 30 s have elapsed, it performs a lock operation on all of the lock actuators, and activates the keyless beeper once.

Remote transmitter pause function operation
    When door locking is performed

  • If a lock signal is input from the remote transmitter or the request switch while the start stop unit recognizes the remote transmitter inside the vehicle with all the following conditions met, the request signal is output using the interior keyless antenna. It also operates the keyless beeper for approx. 10 s.

    • ACC relay and IG1 relay OFF (ignition switched OFF) detected

    • All door latch switch and trunk lid latch switch off signals (all doors, trunk lid closed) received

  • When the remote transmitter inside the vehicle sends the ID data to the keyless receiver, the keyless receiver transmits the received ID data to the start stop unit.

  • The start stop unit receives the ID data, and after approx. 32 s, it suspends the functions of the transmitter inside the vehicle.

    When the trunk lid is closed

  • When the trunk lid latch switch off signal (trunk lid closed) is received with all the following conditions met, the request signal is output using the interior keyless antenna. It also operates the keyless beeper for approx. 10 s.

    • ACC relay and IG1 relay OFF (ignition switched OFF) detected

    • All door latch switch off signals (all doors closed) received

    • Door lock-link switch lock (driver’s door locked) detected

    • Trunk lid latch switch on signal (trunk lid open) received

  • When the remote transmitter inside the vehicle sends the ID data to the keyless receiver, the keyless receiver transmits the received ID data to the start stop unit.

  • The start stop unit receives the ID data, and after approx. 32 s, it suspends the functions of the remote transmitter inside the vehicle.

    Remote transmitter pause cancel operation

  • The functions of the paused remote transmitter are restored when any one of the following conditions is met:

    • Remote transmitter with which engine can be started is brought inside vehicle

    • Lock/unlock button of the suspended remote transmitter is pressed

Remote transmitter left-in-vehicle prevention function operation

  • When the start stop unit receives the trunk lid latch switch off signal (trunk lid closed) with all the following conditions met, it operates the keyless beeper for approx. 10 s and the remote transmitter left-in-vehicle prevention function operates.

    • Trunk lid latch switch on signal (trunk lid open) received

    • All door latch switch off signals (all doors closed) received

    • Door lock-link switch lock (driver’s door locked) detected

    • ACC relay and IG1 relay OFF (ignition switched OFF) detected

  • When the trunk lid opener switch is pressed while the remote transmitter left-in-vehicle prevention function is operating, the start stop unit verifies the remote transmitter ID data and if it determines that the transmitter is inside the vehicle, it sends a trunk lid release request signal to the BCM.

  • When the BCM receives a trunk lid release request signal, it sends a trunk lid release signal to the electrical supply unit (ESU) to open the trunk lid.

  • When any of the following conditions is met while the remote transmitter left-in-vehicle prevention function is operating, the remote transmitter left-in-vehicle prevention function is canceled.

    • Lock/unlock operation using remote transmitter or request switch

    • Any door latch switch or trunk lid latch switch on signal (any door or trunk lid open) received

    • Vehicle speed of 10 km/h or more received

Alert function operation

  • Under the conditions in the table below, the start stop unit sends a security warning request signal via CAN transmission to the instrument cluster. It also activates the keyless buzzer.

  • The instrument cluster turns on/flashes the KEY warning light (red) when it receives the security warning request signal.

Condition

Keyless beeper

Instrument cluster

Keyless warning alarm

KEY warning light (red)

The advanced keyless entry system has a malfunction.*1

???

???

On

The driver’s door is opened with the ignition in ACC.

???

Pattern A*2×Continuous

???

The remote transmitter cannot be detected inside the vehicle when all doors are closed with the ignition not switched OFF.

Sounds 2 x 6 times

Pattern B*2

Flash

A door lock operation is performed using a request switch with any door or the trunk lid open.

Sounds for approx. 2 s

???

???

A door lock operation is performed using a request switch with ignition not switched off.

Sounds for approx. 2 s

???

???

*1
For vehicles with the center display, a warning message in the center display is displayed when the KEY warning light (red) is turned on. For the message content and verification method, refer to the [CENTER DISPLAY]. (See CENTER DISPLAY [WITH CENTER DISPLAY].)
*2
For the keyless warning alarm sound pattern, refer to the [KEYLESS WARNING ALARM]. (See KEYLESS WARNING ALARM.)

Remote transmitter battery voltage low indication function operation

  • When the ignition is switched from ON (engine off or on) to ACC or OFF under the condition indicated in the table, the start stop unit sends a battery voltage low indication request signal to the instrument cluster as a CAN signal.

  • The instrument cluster flashes the KEY indicator light (green) when it receives the battery voltage low indication request signal.

Condition

Instrument cluster

KEY indicator light (green)

Start stop unit receives code for low remote transmitter battery voltage three times*1

Flash (for approx. 30 s after ignition switched from ON to OFF or ACC)

*1
If the remote transmitter battery power is 0, the remote transmitter battery voltage low indication function does not operate.

  • For vehicles with the center display, a warning message in the center display is displayed at the same time the KEY indicator light (green) flashes. For the message content and verification method, refer to the [CENTER DISPLAY]. (See CENTER DISPLAY [WITH CENTER DISPLAY].)

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