SL/R129: Need Help on Window
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Joined: May 2007
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Need Help on Window
My 1992 (300SL-24) The right window won't come down when I fold the soft-top. The window wont come down automatically when I press down.I have to press the switch all the time to make it down fully.
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Joined: Nov 2002
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From: Massachusetts
2018 GLE350, 2014 G550, 2000 SL500, 1980 TR8, 1995 E320 Cabriolet
Have you tried the window reset procedure? I think it's something like roll both windows up, turn the key off for a few second, then then turn the key on but don't start the engine. Within 10 seconds press and hold both window down buttons until the windows are all the way down. Continue to hold the buttons in the down position for at least 5-10 seconds. I think the exact procedure is in the manual. This resets the indexer used by the ECU to keep track of the windows position. This affects the auto-down feature, the top raise/lower, and the window indexing when you open the door (I think some early cars don't have this feature).
I had issues with this when my battery was getting near end of life. As the internal resistance of the battery rose (due to age sulfating of the plates) the battery voltage would drop lower and lower during starting. It got to the point where sometimes the voltage would drop below the retain voltage of the memory in the windows ECU. The system would "forget" and have to be reset.
I hope this helps.
- FD
I had issues with this when my battery was getting near end of life. As the internal resistance of the battery rose (due to age sulfating of the plates) the battery voltage would drop lower and lower during starting. It got to the point where sometimes the voltage would drop below the retain voltage of the memory in the windows ECU. The system would "forget" and have to be reset.
I hope this helps.
- FD
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From: Atlanta, unfortunately
'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
On cars made before 12/94 there is a limit switch in the bottom of each door that closes when the window is completely lowered. Your problem may be that this switch is stuck.
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