Terminal designations
The motor terminals are unified:
- terminal 31 is used for earth connection (in all automotive electrical engineering);
- terminal 53 is energized for the first wiper speed;
- terminal 53a receives positive voltage (+) to move the wiper to its original position: after the driver turns off the wiper, the motor receives voltage through the brush until the wiper is in its lowest position;
- terminal 53b is energized for second wiper speed (parallel winding);
- Via terminal 53e, the motor is braked during reverse operation after switching off, so that the wiper does not go beyond its stop position.
Checking the wiper motor
First of all, it is necessary to find out if the electric motor is faulty or there is no supply voltage. To do this, proceed as follows:
Disconnect the multi-pin motor plug.
With two auxiliary wires, bring a positive to it (+) and negative (-) battery voltage:
- connect the wire from the positive pole to terminal 53 or 53b;
- Connect the wire from the negative pole to terminal 31.
The wiper motor should now operate at first or second speed, depending on the terminals involved. If this is not the case, then the entire electric motor or its corresponding winding is faulty. Removing the wiper motor outlined here.