wiper motor issue
I want to share what we learned on my daughter's hand-me-down 1995 318i. The wipers did not work and it was not the control module behind the glove compartment ($88 for mechanic to pull out and test new one and put the old one back in). We were told that it probably needed a new motor for about $800 (new from BMW +shipping from Germany + labor). I nearly fainted. My husband is an electrical engineer who knows a lot about cars. So, he and I pulled out the motor, which was not simple but we did it. When the motor was out but still attached to the wiper control arms, and lying on top of the engine, it ran just fine. So, my wonderful husband put it back in and it did not work. He pulled it out again and it did not work. He shifted it a bit and it worked. I read forums and info out loud to him between all these sessions. We finally found a bit of info that the motor grounds to itself. He figured out that our old motor had a faulty or aged grounding mechanism. So, he added a ground wire from the bolt at the top of the bracket to the bolt at the bottom of the bracket. We put it back in and it worked beautifully. Brilliant! Then, with collaborative memory, we put the other stuff back together and gave the car back to my very happy 18 year old daughter. Time and effort, quite a bit. Cost $0. Appreciation for my husband -infinite!