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Central locking

The central locking system is composed of the following elements:

  1. A radio receptor (in the dashboard)
  2. The tailgate/trunk lock
  3. The tailgate/trunk opening switch
  4. The door locks
  5. Control software (part of the BCM)
  6. A transmitter key fob
Radio receptor

In Europe, the transmitter of the central locking system operates in the 433.92 MHz frequency band. The remote receiver, the RFA-Modul (“Remote Frequency Actuator”) is placed in the dashboard. It is connected to the BCM via a LIN bus.

Locking/Unlocking - Central locking

The central locking operates over all doors and the trunk/tailgate, so that these cannot be opened from the vehicle exterior. In vehicles with door modules in both the front and rear doors (vehicles with rear power windows), the control of all door power locks and switches is done by the door locking module. The door ajar signal will be routed directly to the BCM. In vehicles without rear door modules (manually operated rear windows), the power locks will be controlled directly by the BCM.

The central locking will activate when any of the following conditions is met:

  • A key is turned into the lock position in any door lock.
  • The lock key is pushed once in the key fob.
  • The upper, small lever in the inner door handle is pushed in (if installed, depends on trim level).

If any of the vehicle's doors is ajar when enabling the central locking, all doors will cycle through lock and unlock states. This will be acoustically signalled. The successful central locking of the vehicle's doors will be confirmed via a short, double flash of the vehicle's turn signals.

Locking/Unlocking - Double locking

The double locking system locks all doors, so that they cannot longer be opened from outside the vehicle. In addition, the double locking also disengages the inner door handles from the door locking mechanism, so that the door can no longer be opened from inside the vehicle. The double locking only works when the key is not inserted in the ignition switch.

The double locking is activated when any of the following conditions is met:

  • A key is turned into the lock position twice within a 3 seconds interval, in any door lock.
  • The lock switch in the remote key fob is pushed twice within a 3 seconds interval
  • Die Verriegelungstaste auf der Fernbedienung wird innerhalb von 3 Sekunden zweimal gedrückt (when the vehicle is configured to activate the double locking if a double press of the lock button is detected in the remote key fob).

In case the ignition switch is in the “I” position, the vehicle doors will all lock, but the double lock will not engage. If the vehicle doors have previously been double locked, and a key is inserted in the ignition switch, the vehicle doors will transition from double locked to locked.

The activation of the double lock will be confirmed through a flash of the vehicle's turn signals. There will be no flash of the vehicle's turn signals in case the vehicle doors are simply locked.

Locking/Unlocking - Central unlocking

The central unlocking unlocks all vehicle's doors and trunk/tailgate. The unlocking will occur when any of the following conditions is met:

  • The lock of any of the vehicle's door is turned into the unlock position.
  • The unlock key of the remote key fob is pushed once (when the vehicle is not configured to only unlock through the driver's door lock)
  • The unlock key of the remote key fob is pushed twice within a 3 seconds interval (when the vehicle is configure to only unlock through the driver's door lock). The door handle on a front door is pulled into unlocked position in vehicle's on which central locking is enabled.
  • The door handle on vehicles with keyless entry and start system is pulled into the unlocked position, while the one the the keyless fobs configured in the vehicle is within range of the vehicle's transmitter.

If the vehicle is configured to open only through the driver's door, a single push in the unlock button of the key fob will only unlock driver's door. A new press of the unlock button of the key fob within 3 seconds of the first will unlock the remaining doors. If the vehicle's double lock was engaged, all doors will switch to central lock, while the driver's door will unlock. Unlocking the vehicle with the ignition switch in off position will be confirmed via a single, long flash of the vehicle's turn signals.

Locking/Unlocking – automatic relocking

The automatic relocking will return the vehicle to its previous locking status, if it was central or double locked and the conditions below apply:

  • Vehicle is unlocked using the remote key fob.
  • Neither a vehicle's door nor the tailgate/trunk are opened within 45 seconds.
  • The ignition switch is not turned into the on position.
Tailgate

The tailgate/trunk release switch unlocks the tailgate/trunk when the ignition switch is in the “O” or “I” position and one of the following conditions is met:

  • The tailgate unlock switch located in the exterior of the vehicle is pushed, when the vehicle has been locked through the driver's door lock or is central locked.
  • The tailgate opening button in the remote key fob is pushed once (when the vehicle is configured to open the tailgate with a single press of the remote key fob button).
  • The tailgate opening button in the remote key fob is pushed twice within 3 seconds (when the vehicle is not configured to open the tailgate when the button in the remote key fob is pushed once).

If the tailgate/trunk is open when the vehicle has been locked using the remote key fob, it will be automatically relocked once it is closed again.

Functionality in vehicles with keyless entry and start system (Keyless-Go)

As an option, a keyless entry and start system is available, where receivers at each of the front door's handles and the tailgate verify that a “passive key” programmed in the vehicle is present within the range of the system and prepare the door's locking mechanism to open. Afterwards, sensors in the vehicle's inner cabin verify the presence of the programmed, valid “passive key” to start the ignition, after verification of clutch pedal depression (in manual transmission vehicles) or brake pedal depression (for vehicles equipped with automatic transmission).

Received signals are then forwarded to the keyless entry and start module, that controls all other locking and unlocking functions. Depending on the configuration, only the driver's door, or all doors will be unlock when the driver's door handle is pulled. If the vehicle is configured for “single door unlocking”, the pulling the handle of any other door aside the driver's door will enable central unlocking.

After leaving the vehicle, this can be locked (via a single press) or double locked (via a double press) through the switches in the front door handles and the tailgate. In this case, the request (lock/unlock) is sent from the keyless entry and start module to the BCM using the MS-CAN bus. The BCM will then communicate with the door modules over the MS-CAN bus to lock or unlock the vehicle.

Additionally, all door lock and unlock functions can be performed via the remote control in the “passive key”. Also, within the “passive key” an emergency key is stored, that can be used to open the vehicle and start the ignition using an adapter.

Keyless start system

As an option, a keyless entry and start system is available, where receivers in the inner cabin verify that a “passive key” programmed in the vehicle is present within the range of the system and trigger the ignition system to start the engine, after verification of clutch pedal depression (in manual transmission vehicles) or brake pedal depression (for vehicles equipped with automatic transmission).

Once the ignition lock is released the vehicle can be started by pressing the start button in the dashboard, provided that the gearbox is in neutral position and that the clutch pedal is fully depressed. (in vehicles with manual transmission), or that the gearbox is in “park” position and the brake pedal is depressed (in vehicles with automatic transmission).

To stop the engine, the start switch must be pressed again and the vehicle speed must be under 7 km/h. A longer push of the start button will stop the engine at any speed. If the button is pressed again within a 10 seconds interval, the engine will restart without the system performing a new verification of the presence of a programmed “passive key” within range. The only requirement applicable in this case will be the depression of the clutch or brake pedal, depending on the vehicle's transmission type.

If a programmed “passive key” is detected by the system when the start button is pressed, but the clutch/brake pedal (depending on vehicle's transmission type) is not depressed, the vehicle's ignition will be switched on, but the engine will not start. Pressing the start button again, will switch the ignition off.

  • en/artikel/zentralverriegelung/start.txt
  • Last modified: Wed. 30.01.2019 08:16
  • by jphid