Hey there. I have taken the wiper motor out and inspected the connectors, the 4 wires going from control module to wiper motor. Are the contacts the 4 wires? The wires are connected to the bottom of the wiper motor with some sort of glue-gun looking substance. I opened the bottor metal cover and inspedted the wires. There were 3 resistors connected there and i cleaned some grease that got there. Unfortunately, the problem is still there.

Now, do I need to take the actual motor cone out too? I think that thing just has the mechanical gears and stuff.

 

Without the component in front of me I really can't help much more. You need to trace where the four wires go. OK there are some resistors. (surprise No.1) but there should be some form of switch which can sense the position of the output spindle, not the motor shaft which will rotate many times per sweep of the screen.

If there is no such device to sense position then MB must sense position using current waveform which will all be in software in the control unit in which case I guess you are back to the original diagnosis from the dealer, the control unit.

If indeed the sensing is done by software it is still possible that the wiper motor itself is on the way out and giving a completly incorrect waveform for the control module to analyse. I repeat that control modules (except in very early life) don't usually go wrong unless the car has been jump started incorrectly etc.

No need to take the motor itself apart since this is working. There will be wires connecting to the motor rotor through brushes however.

When you put it back together make sure the unit is watertight. The gung you refer to will likely be a silicon RTV sealant like you use around the bath tub to make the access point for the wires watertight.

Let us know what happens since this may help others. Stuart

 

Still here. A quick question, what ius the Mercedes part # for combination control module? Is it n 10-3? I am trying to find a used one. I cant see myself giving them $800 for a stupid module.

Thaks.

 

bump.

 

Hey there. I called the dealer today to get the part number and they wont give it out. He claims it is their policy. Did anyone heard this crap from any other dealer. This one is located in Jax fl, Brumos motors.

Is there a online catalog I can use to locate the part #.

 

http://www.mercedesshopen.com/Shop/I...nguage=LangEng

Try here for a 2nd hand part and price.

Bazzle

 

A170 820 09 26

 

Thank You.