Faulty wiper motor or lead wire?
The following test will help you identify a malfunction of the wiper motor or wiring:
Remove the cover above the sump tank at the rear in the engine compartment.
Disconnect the multi-pin connector of the wiper motor.
Two auxiliary wires should now be routed: one from the positive battery terminal to terminal 53 or 53b (connections of black-gray or green-yellow wires).
The second wire is routed from the negative battery terminal to terminal 31 of the wiper motor.
The windshield wiper should now operate at first or second speed, depending on the terminal selected for connection. Otherwise - a malfunction of the wiper motor.
If the wiper starts working, then the fault lies in the switch or in the supply wiring.
Removing the wiper motor
Switch on the ignition and allow the wipers to return to their original position.
Remove wiper arms.
Remove the black plastic cap from the water trap by lifting up the front edge.
Unscrew the two hexagon bolts at the top on the wiper shafts and one at the bottom of the engine.
Disconnect the multi-pin connector of the wiper motor.
Remove the wiper arms along with the engine.
Disconnect the linkages from the wiper axles.
Remove the three screws on the wiper motor. To get to all the screws, you need to turn the engine crank.
Installing a new wiper motor
If a new engine is installed or an old one after repair, you should pay attention to:
Connect the engine electrics and let it run for a short time. Turn off and wait until it returns to its original position.
Install the engine on the console, put on the drive crank and wiper arms.
The drive lever to the left axis of the wiper is placed on the engine crank from below, the right axis of the wiper is connected to the engine crank from above.
Now tighten the engine crank so that it is in the position shown in the figure below on the right.
If the drive crank is not fixed in a certain position, then when the movement starts, the levers will move down.
Installing the wiper arms: the fixing screws should be tightened rather loosely, they sit in plastic bushings!
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