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Update on repairing headlight wiper motor
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Posted by Laurent in Mountain View [Email] (more from Laurent in Mountain View) on Sun, 17 Jul 2011 20:20:54 Share Post by Email
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So, I gave the headlight wiper system a shot this weekend. Removing it is fairly easy. I didn't have to disconnect the headlight, just remove it and put it on the side. Same for the flasher.

The problem the system has it that it will start wiping but will stop in the middle of its motion. Always right in the middle. So, I got an AC to DC converter and did remove the case back. I think this was the hardest part to remove. The plastic tabs holding the back to the case were stuck and a couple were damaged in the operation, even though I was very careful. The inside didn't reveal anything interesting besides the pics that are available on the net showing the internals. I tried to run the motor from the converter and got exactly the same result. What it seems to be doing is after a few rotations, the motor just dies. it doesn't complete the last swipe to park the wiper, it just dies there, as if it was running out of power. I wasn't sure if my converter was not good or something, so I took it back to the car. It did the same thing. The first time the electric circuit is closed, the wiper will run as expected. Then, it just dies in the middle of a swipe. No matter if electricity is applied again, it won't bulge. If I wait long enough, then it will work again, doing a couple of swipes and then will just dies.

So, it seems that on the car or with the converter, the symptom is the same. I'm not an expert in small electric motors so I'm not sure what is wrong. I didn't open the motor fully. I might do that next weekend. I'm thinking that the motor is maybe at the end of its useful life. It doesn't spark or smoke or anything like that. I don't hear any suspicious noise. It runs properly, driving the wiper shaft until I can clearly hear it lowering speed and momentum, as if it was connected to a battery that is running out of juice. Very strange. I was expecting it would be jammed or something but that's not what I did observe.

Any comment welcome at this point.

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