Function

Example of basic function sequence for unlocking vehicle with infrared remote central locking (IRCL)
Point transmitter window on remote control at receiver and press remote control button. The infrared control module then supplies positive voltage to the supply pump via a control lead.
The supply pump starts up producing pressure which flows through a system of lines to all pneumatic elements. The diaphragms in the elements are pressed up actuating the locks via a linkage and unlocking the vehicle.
The tank flap element unlocks the flap directly.
When a pressure of approx. 450 mbar is reached in the system, a pressure switch switches off the supply pump.
This relieves the pressure in the pneumatic system of lines and elements via the supply pump - the system is no longer under pressure and the unlocking operation is completed.

The locking operation is accomplished in a similar manner to the unlocking operation. However, negative control voltage is fed to the supply pump the next time the remote control button is pressed. The direction of rotation of the pump motor is reversed so that the pump provides the vacuum required for locking.







Function schematic


Pressurizing and depressurizing (vehicles as of approx. 01/94)
The two pressurizing and depressurizing valves below the driver's and front passenger's seat are no longer used as of the introduction of the bipressure pumps with immobilization output. For the pressurizing and depressurizing function of the central locking, the supply pump runs briefly in the opposite direction after reaching the shut-off pressure. The pressure in the system is thus reduced. As a result the vehicle can be locked immediately after unlocking or vice versa without increased use of energy.

Emergency opening
In order to facilitate the release of occupants of a vehicle which has been locked from the inside, in the event of a severe accident, the vehicle unlocks automatically.
Unlocking takes place when an acceleration of more than 4g or a vehicle inclination of more than 26° occurs and the ignition key is in position "1 or 2".
To do this, the control unit for the roll-over bar controls the supply pump for the central locking, which initiates unlocking of the vehicle after a 5 second delay.