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1994 S320 - window motor drains battery

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Old 01-29-2011, 06:12 PM
frankthetank's Avatar
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Location: NorCal
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Default 1994 S320 - window motor drains battery

The driver window motor drains the battery over night; no keys in the ignition, all switches off.

The original motor failed after charging the battery for a day, as I didn't make the connection between the two problems.

I replaced the old motor last week; new motor/window functioned properly for 3 days, and then stopped ... dead battery returns!

With power to the battery (charger) you can hear the motor cycle (few seconds) on / off as if trying to move the window. The motor removed from the door - runs continously, but does not respond to the up/down button to reverse direction.

With the power leads (2 wires top snap connection) removed, battery holds a charge .... window remains in the closed position!

How does the window motor get "top"/"bottom" sensor information?
How does this get fixed?
 
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