Mercedes-Benz GLS 2020 Operator's Manual page 89

Problem
The sliding sunroof cannot be closed
and you cannot see the cause.
Possible causes/consequences and
& WARNING Risk of becoming trapped or fatal injury by closing the sliding sunroof again
If you close the sliding sunroof again immediately after it has been blocked or reset, the sliding sunroof
closes with increased force.
Parts of the body could become trapped in the closing area in the process.
Make sure that no parts of the body are in the closing area.
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Release the button immediately if somebody becomes trapped.
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or
Press the button in any direction during the automatic closing process.
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The closing process is stopped.
If the sliding sunroof is obstructed during closing and reopens again slightly:
Immediately after automatic reversing, pull and hold the 3 button down again to the point of resist‐
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ance until the sliding sunroof is closed.
The sliding sunroof will be closed with increased force.
If the sliding sunroof is obstructed again and reopens again slightly:
Repeat the previous step.
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The sliding sunroof will be closed again with increased force.
Pull and hold the 3 button little by little until the sliding sunroof is fully closed.
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M M Solutions
Opening and closing 87