Diagnose power window
05-13-2018, 02:27 PM
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W203 01' C200k
Diagnose power window
So suddenly my front passenger window started acting up.
It was really slow upwards, and needed physical help to run the window up. Down was ok. And then suddenly it wouldn't work at all. I disconnected the battery and after reconnecting, the window would work again, but still upwards was very slow. I needed to spam/tap on/off upwards for it to move 1 cm every time. Or else it would stop.
Now I removed the door panel and disconnected everything. I removed the motor and connected it directly to the battery. The motor spins both ways, but whenever it goes via the switch, I need to spamtap the upwards function. If I use the other switch in the car for the same window, the same thing happens. (Switch located on driver side, main panel). Is there any sensors that would stop the motor? Maybe if it was weak? Is it logical that the motor would spin freely one way, but not the opposite way, even if it doesn't have any "load"? (Removed from the window regulator/elevator).
Where do I go from here? What numbers should I receive if I ohm the motor?
Thanks in advance
It was really slow upwards, and needed physical help to run the window up. Down was ok. And then suddenly it wouldn't work at all. I disconnected the battery and after reconnecting, the window would work again, but still upwards was very slow. I needed to spam/tap on/off upwards for it to move 1 cm every time. Or else it would stop.
Now I removed the door panel and disconnected everything. I removed the motor and connected it directly to the battery. The motor spins both ways, but whenever it goes via the switch, I need to spamtap the upwards function. If I use the other switch in the car for the same window, the same thing happens. (Switch located on driver side, main panel). Is there any sensors that would stop the motor? Maybe if it was weak? Is it logical that the motor would spin freely one way, but not the opposite way, even if it doesn't have any "load"? (Removed from the window regulator/elevator).
Where do I go from here? What numbers should I receive if I ohm the motor?
Thanks in advance
05-14-2018, 04:50 PM
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Thanks for answering.
I picked up an used module today to test.
Only problem is that it works as it should now today.. Typical. Anyways, I have the other module in backup temporarely, will test more tomorrow. But both of them works atm .. But what I noticed, was that on my original part, it says Q7. But my backup part is Q4. Different part number aswell. Is there any way to look up if there is any difference? Both works for window and adjusting the side mirror. And the wiring looks fairly alike.
I picked up an used module today to test.
Only problem is that it works as it should now today.. Typical. Anyways, I have the other module in backup temporarely, will test more tomorrow. But both of them works atm .. But what I noticed, was that on my original part, it says Q7. But my backup part is Q4. Different part number aswell. Is there any way to look up if there is any difference? Both works for window and adjusting the side mirror. And the wiring looks fairly alike.
