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  #1  
Old 01-17-2014, 09:03 PM
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2005 E320 Rear Window Problem

Hello all. Yesterday I took possession of a 2005 E320 with only 32,500 miles on it. It's a CarFax certified Florida car in great condition and I hope to have it a long time (my last E320-W210, lasted almost 18 years). One slight problem with the new car. It has Keyless Go, which is a pretty cool system. But, the passenger side rear door window keeps going down on its own. It doesn't go down in a smooth motion, but goes down a couple of inches at a time, almost like a jerking motion. Most of the time I can make it go back up from the switch on the driver's door, but it takes multiple attempts. I'm not sure if it's the window regulator (I changes a bunch of those on the 210), or the Keyless Go system. Any thoughts? Thanks.

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Old 01-17-2014, 11:16 PM
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Maybe an intermittent short in the switch? hitting bumps, etc have any effect on this?
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Old 01-18-2014, 08:46 AM
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I thought about the switch, but this happens whether the car is in motion or not. The window seems to do this most right after the car is unlocked.
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Old 01-18-2014, 04:19 PM
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The CAN bus window motors have been known to go bad in general. Mine went bad on my car. Of course it is a different car than yours but they both have CAN bus. The dealer can diagnose it with their computers, but a new regulator out of a junk yard might be cheaper. The fact that your switch only works sometimes suggests a fault with the motor/module (one piece).

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