Mercedes-Benz 2009 GL320 BlueTEC Operator's Manual page 402

Practical hints
Flat tire
Changing wheel on passenger side (example
illustration)
X
Place the wheel chock and another sizeable
object in front of both wheels on the side
opposite to the side on which the wheel is
to be changed.
Changing wheel on a slight incline
Always try lifting the vehicle using the jack on
a level surface. However, should
circumstances require you to do so on a slight
incline, place the wheel chock and another
sizeable object as follows:
400
Changing wheel on passenger side (example
illustration)
X
Place the wheel chock and another sizeable
object in behind both wheels on the side
opposite to the side on which the wheel is
to be changed.
Wheel wrench
1
X
On wheel to be changed, loosen but do not
yet remove the wheel bolts (approximately
one full turn with wrench 1).
The jack take-up brackets are located directly
behind the front wheel housings and in front
of the rear wheel housings.
G Warning!
The jack is designed exclusively for jacking
up the vehicle at the jack take-up brackets.
Make sure the jack arm is fully seated in the
jack take-up bracket.
If you do not position the jack correctly in
the jack take-up bracket, the vehicle can
fall off the jack and seriously or fatally injure
you or others.