Audi A3 8L - Rear Wiper Motor Diagnosis: 12V Input Voltage, 5A Max Workshop Power Supply & Issues

Welcome.

Today I got to check the engine and system from the rear wiper Audi A3 8L. I received only as much as you can see in the pictures below. The owner claims that the input voltage is reaching and yet the engine is not running. The engine itself can be connected to 12V for a short time and check, but will anyone with a diagnosis of this electronics help here?

The second thing is that I can only power it from a workshop power supply giving max 5A. Just such a current to start this engine?

Check out this big transistor

139 CR 708A
From what results from the network (from another thread on the electrode too) it is a thyristor. Other information shows that checking the thyristor is not quite so simple. How to approach this?

For this I found damage in the form of a broken coil in the engine itself. I soldered her.


Interestingly, the motor winding resistance measured directly on the commutator is 0.8 ? / winding. The resistance measured at the motor contacts (with the commutator removed) goes in thick M?. After inserting the commutator on the contacts we have a winding resistance of 0.8 ?, but after installing the motor housing the same resistance on its contacts = 0 ?.

- EDIT = = -

After a thorough search of the motor for a short circuit, it turned out that the counter plates of the brush springs were gently removed and shorted to the housing. Oh! The owner will get scold for rummaging in the engine (he probably wanted to check the brushes since the engine was not working) and not only that the bent metal was not mentioned yet. Jester.

The engine started. Today I will give it back and wait for the result of mounting it in the car.