Each engine is switched on by a switch and, in most cases, manually. In the case of an electric antenna, the switch is controlled automatically by the radio receiver.
1. Check the electric motor fuse and replace if necessary.
Attention! The electric motors of the window lifts and the sunroof have safety machines that switch off as a result of excessive load, then switch on again after some time. Before switching on again, it is necessary to eliminate the cause of the overload. The reasons may be frozen glass or dirty glass guides.
2. If the fuse blows again, then there is a short circuit somewhere.
3. In order to immediately find out whether the engine is working or not, connect two additional wires (about 2 mm) from the car battery directly to the engine. Positive wire to the positive pole, negative wire to the negative pole of the electric motor. In case of doubt, the location of the poles is indicated in the electrical diagram. If necessary, the engine can be removed. All electric motors of the car operate from the voltage of the on-board network (from 12 to 14 V). If the engine is running, then there is a break in the current circuit.
Warning! A motor that rotates slowly or does not rotate at all may indicate worn out graphite brushes. In this case, replace the graphite brushes.
4. If the engine is running, use the electrical diagram to determine which wire supplies it with current if the ignition and switch are on.
[The text is copied from this portal: www.VWmanual.ru]
5. Check the wire supplying voltage to the electric motor with a test lamp. Since the current is quite high, check with an incandescent lamp, which has sharp needles for piercing the connecting wire. This makes it easier to check the voltage. The connecting terminals of the electric motors are marked with small numbers. They are standardized:
- terminal 32: ground connection,
- terminal 33: Positive (+) connection.
Left-hand rotation motors, such as window lifters, have two positive connections:
- terminal 33L: left rotation connection,
- terminal 33R: right rotation.
Attention! The windshield wiper motor has a special terminal designation (see subsection 10.5).
6. If there is no voltage on the engine, the circuit is faulty. Find the fault in the electrical circuit and fix it. Electric motors, due to high current consumption, have additional switching relays.
7. If no fault is found, check the switch.
8. If the cable is faulty, it makes sense to lay a new cable, since it is very difficult to detect a break in it.
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