Each motor is turned on, if necessary, with a separate switch, usually manually.
1. Check the fuse for the relevant motor. Replace if necessary.
Attention! The electric motors for the window lift and the sunroof have circuit breakers that turn off when overloaded, and turn on again after a while. Before switching on again, the cause of the overload must be eliminated. This may be caused by frost on the windows or dirty window guides.
If the fuse blows again immediately, this indicates a short circuit.
To establish unequivocally whether the defect is related to a malfunction of the electric motor, connect it with auxiliary wires (with a cross section of 2 mm) directly to the battery or the appropriate leads from the battery. If the motor runs normally after applying power through the auxiliary wires, it means that it was not powered.
If the motor rotates too slowly or intermittently, wear of the graphite (coal) brushes. In this case, the motor brushes must be replaced.
If the electric motor is running, then, guided by the electrical diagram, determine which wire supplies voltage to it if the ignition and switch are on.
2. Check up by means of a control bulb a feeding wire at the engine. Since the motors consume a lot of current, you can use a conventional test light. The connecting wires of this tester have sharp probes that can pierce the wire insulation, making it easy to check the voltage.
If voltage is not supplied to the motor, then this indicates a power failure. It is necessary to find and eliminate the malfunction according to the principle diagram. Due to the high current consumption, electric motors usually have an additional switching relay. The procedure for checking the relay is given in the corresponding chapter.
3. Check the switch if no fault is found.
If the wire is broken, then it is more advisable to lay a new one, since it can be difficult to localize the place of the wire break.
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