Mercedes-Benz 2013 GL X166 Operator's Manual page 99

If the side window opens again slightly:
X
Immediately pull the corresponding switch
on the door control panel until the side
window is completely closed (
X
Hold the switch for an additional second.
X
If the corresponding side window remains
closed after the button has been released,
the side window has been reset correctly.
If this is not the case, repeat the steps
above again.
Y page 94).
Side windows
Z
97