1990 Mercedes Benz 500SL Windows Service and Repair
Synchronizing Power Windows
If the power supply was interrupted (battery disconnected or low), the windows cannot be opened by the Express feature.
To resynchronize the Express feature:
Press the UP side of the window switch (to the 2nd detent, if present) until the window is completely closed and hold for and additional 2 seconds.
Repeat procedure for each window.
Note: If vehicle is equipped with two way Express feature, each window may also have to be resynchronized in the full open position as well.
Press the DOWN side of window switch (to the 2nd detent, if present) until the window is completely opened and hold for and additional 2 seconds.
The automatic full opening procedure of the windows should now be restored. Download File PDF
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