Mercedes-Benz S-Class Owner's Manual page 103

Problem
The rear roller sunblind does not move
smoothly.
Possible causes/consequences and
Use automatic operation to fully open and then close the sliding sunroof.
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Pull and hold button 1 down repeatedly until the rear roller sunblind is fully closed.
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Pull the 1 button for another second.
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Use automatic operation to fully open and then close the rear roller sunblind.
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M M Solutions
Opening and closing 101