To open the boot lid/tailgate, the boot lid / tailgate lock is electrically unlocked by the boot-lid / tailgate unlocking.
The boot lid/tailgate is opened and closed with the boot lid/tailgate lift (HKL).
With Soft Close Automatic (SCA), the boot lid/tailgate is drawn in a controlled manner into the lock by a sensor-controlled electrical drive unit on closing.
The CAS Car Access System control unit contains the functions of
The CAS Car Access System control unit is also the gateway module between the data buses K-CAN SYSTEM and K-CAN PERIPHERALS.
The CAS controls all the higher-order functions of the central locking system.
As well as other functions, the power module (PM) also contains the boot lid/tailgate unlocking function and Soft Close Automatic (SCA) for the boot lid/tailgate.
The release drive is installed in the boot lid/tailgate. It is activated by the power module (PM) and unlocks the mechanical boot lid / tailgate lock. The release drive incorporates the rear lid contact, which signals to the power module (PM) the position of the rear lid lock.
The SCA drive is installed in the body. The SCA drive incorporates a position switch, which records the position of the SCA drive. The SCA drive is controlled by the power module (PM).
After operation of the hotel switch, the hotel setting is engaged. In the hotel setting, the button for opening the boot lid/tailgate is deactivated on the remote control. The BOOT (S8) button on the front interior light unit on the headlining is also deactivated. The boot lid/tailgate also remains locked when the vehicle is unlocked. The hotel switch is fitted in the upper glovebox beneath the switch for setting the clock.
To open the boot lid/tailgate, the boot lid / tailgate lock can be unlocked using the following controls:
The rear lid lock is unlocked by the release drive. If the power module (PM) is informed by the boot-lid contact that the lock is open, the drive for the Soft Close Automatic (SCA) is activated to wards 'open' (top dead centre). The drive is active until top dead centre is reached and the position switch in the drive connects to ground.
See functional description: Boot lid/tailgate lift
The closing operation for the rear lid is performed by way of defined positions.
The defined positions for closing are:
Rear lid closed:
Rear lid open
To close the boot lid/tailgate, the following controls can be used:
The rear lid is closed by the boot lid/tailgate lift. As of ”pre-engage”, the drive for Automatic Soft Close draws the boot lid/tailgate into the lock and runs until the lock is in the state ”locked”. The SCA drive is activated when the rear lid is pressed closed. In this case, the rear lid lock is pressed against the cam of the SCA drive and rotated. The rear lid contact is opened. The SCA drive is activated and moves towards bottom dead centre. The position switch in the SCA drive opens at bottom dead centre. The SCA drive stops.
The SCA drive is deactivated after 5 seconds if the power module (PM) fails to detect arrival at top or bottom dead centre. A fault is stored in the fault memory.
The functional sequence starts again when a signal change is signalled by the rear lid contact.
An anti-repeat circuit prevents electronic components in the control unit from overheating. The anti-repeat circuit permits a maximum of 15 activations in succession.