The control unit for the locking system and the anti-theft system, if any, is integrated with the dual-flow pump.
Hint: The special feature of the trunk lid lock is that when the key is in the vertical position, the trunk is always locked, regardless of the locking system. This prevents luggage from being stolen, for example when stopping at a traffic light. In the horizontal position, the trunk lid lock reacts in conjunction with the entire central locking system.
Checking the central locking system
Unlock and then lock the driver's or front passenger's door or the boot lid with the key.
The central locking system must be activated on all three doors.
After about 2 seconds, all locks should be locked.
If the pump runs for more than 5 seconds, this means that the system is leaking - in this case, the dual-flow pump should work no more than 35 seconds, then it should turn off.
Hint: If the central locking system is malfunctioning, you can unlock and lock the doors and trunk lid in the normal way using the key. You can also lock the doors manually with the buttons.
Electrical Troubleshooting
The following description applies to vehicles with or without an anti-theft system. Tested in a double flow pump 6-pole and 12-pole plug connection. Cars equipped with an anti-theft system have another 16-pin plug connection at the pump, which is not described below, however.
If the pump does not work either when turning the key in the fat or in the tailgate:
Check fuse (chapter «Body electrical system»).
Remove rear seat; the dual-flow pump is located on the right under the rear seat in foam.
Remove the pump from the foam and disconnect the multi-pin plug from the pump.
Remove the sheath of the narrow 12-pin plug.
Check the locking element of the driver's door: connect a test lamp in the plug between the contact of the green-blue wire and «weight» (corps) body.
The control lamp should burn constantly if the driver's door is opened by a key. In this case, the opening contact of the locking element is OK.
If the lamp does not light up, then the opening contact of the driver's door is faulty or the electrical circuit is interrupted.
Now switch the test lamp: the wire that went to «mass», should be connected to the positive terminal of the battery. The other contact remains in the plug (green/blue wire contact).
Lock the driver's door with the key.
If the control lamp now lights up permanently, then the closing contact of the locking element is in order.
If the lamp does not light up, but the wires are intact, this means that the locking element is faulty.
Check the locking element of the front passenger door: connect the test lamp in the removed pump plug between the contact of the yellow-blue wire and «weight» (corps) body.
The control lamp should burn constantly if the door of the forward passenger is opened by a key. In this case, the opening contact of the locking element is OK.
If the lamp does not light up, then the opening contact of the front passenger door is faulty or the electrical circuit is interrupted.
Now switch the test lamp: the wire that went to «mass», should be connected to the positive terminal of the battery. The other contact remains in the plug (yellow-blue wire contact).
Lock the front passenger door with the key.
If the control lamp now lights up permanently, then the closing contact of the locking element is in order.
If the lamp does not light up and the wires are intact, this means that the locking element is faulty.
Check the locking element of the tailgate/tailgate: Connect a test lamp in the removed pump plug between the brown-green wire contact and the positive battery terminal.
The control lamp should burn constantly if a trunk lid is opened by a key. In this case, the opening contact of the locking element is OK.
If the lamp does not light up, then the opening contact of the trunk lid is faulty or the electrical circuit is interrupted.
Now switch the test lamp: the wire that went to the contact of the brown-green wire should be transferred to the brown-scarlet wire. The other pin remains connected to the positive terminal of the battery.
Lock the boot lid with the key.
If the control lamp lights up constantly while the key is in the locking position, the contact of the locking element is in order.
If the lamp does not light up and the wires are intact, this means that the locking element is faulty.
Checking a double-flow pump: if the pump is controlled by means of shut-off elements (see description in previous paragraphs), then, therefore, the cause of the malfunction is only the power supply (through a thin black/blue wire in a 12-pin plug and a thick red/black wire in a small 6-pin plug) or fuzzy connection on «mass» (frame) (thick brown wire).
If everything else is in order, then the pump itself is faulty. Replace.
The illustration shows the elements of the central locking system and their passage:
1 - one of the vacuum pipelines;
2 - locking element of the front passenger door;
3 - locking element of the rear right door;
4 - locking element of the fuel tank cap;
5 - vacuum pump to the luggage compartment lock;
6 - luggage compartment lid lock;
7 - locking element of the rear left door;
8 - locking element of the driver's door;
9 - door handle with microswitch (only with central locking and/or anti-theft system);
10 - pump.
Pneumatic Troubleshooting
To check for leaky central locking systems (Symptom: Two-flow pump running too long) you need to check the system step by step.
Double-flow pump: squeeze the hose directly next to the compressor with pliers, thereby sealing it hermetically. Open and close one of the locks.
If the pump runs longer than 3 s, maximum 7 s when the central locking system is activated, the pump is leaking. Replace.
Locking elements for doors and luggage compartment: Clamp all pipes one by one directly next to the locking elements. To do this, remove the corresponding covers (chapter «Body elements»). Use one of the locks every time.
The pump must not run when the central locking system is operated for longer than 3 s, maximum 7 s.
After compression of the defective (leaky) tubing, the pump is operating normally - that is, less than 3 s. Replace defective part.
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