Sequence of work
1. First find out in which part of the system the malfunction occurred: in the electrical system or in the pneumatics. To do this, listen to see if the rear pump turns on when you turn the key or press the remote control button.
2. If the pump does not work, check the voltage supply. The pump may be running when closed from another location. This indicates the likelihood of failure of the corresponding enable contact or disconnection of its wiring connection.
3. If the pump runs but no blockage occurs, the system is leaking. Perhaps a hose has disconnected somewhere or a crack has appeared in the membrane of one of the drive mechanisms.
4. For a simple determination of the place of depressurization, remove all rugs from the passenger compartment and, in turn, remove the contact connectors of the hoses leading to the door mechanisms. At the same time, close the hose connection in the direction of the pump.
5. If the blockage suddenly works, the search for leaks should be carried out in the circuit that was just disconnected.
6. If the lock does not work on any one door, check the free play of the lock drive mechanism. On the fuel filler door mechanism, check the free play of the locking pin in the guide bush.