Mercedes-Benz GLS Operator's Manual page 542

540 Wheels and tires
The foot of the jack must be positioned verti‐
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cally under the jack support point.
Rules of conduct when the vehicle is raised:
Never place your hands or feet under the
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vehicle.
Never lie under the vehicle.
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Do not start the engine and do not release
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the electric parking brake.
Do not open or close any doors or the tail‐
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gate.
Using the lug wrench, loosen the wheel bolts
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on the wheel you wish to change by about
one full turn. Do not unscrew the bolts com‐
pletely.
Position of jack support points
& WARNING Risk of injury from incorrect
positioning of the jack
If you do not position the jack correctly at
the appropriate jacking point of the vehicle,
the jack could tip with the vehicle raised.
Only position the jack at the appropri‐
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ate jacking point of the vehicle. The
base of the jack must be positioned
vertically under the jacking point of the
vehicle.