Mercedes-Benz GL-Class: Towing a vehicle with both axles onthe ground
When having your vehicle towed, observe the important safety notes.
WARNING 
The power assistance for the steering and the
brake force booster do not work when the
engine is not running. You will then need
much more effort to brake and steer the
vehicle. Adapt your style of driving
accordingly.
The automatic transmission automatically shifts to position P when you open the driver's or front-passenger door or when you remove the SmartKey from the ignition lock. In order to ensure that the automatic transmission stays in position N when towing the vehicle, you must observe the following points:
► Make sure that the vehicle is
stationary and
the SmartKey in the ignition lock is in
position 0.
► Turn the SmartKey to position 2 in the
ignition lock.
On vehicles with KEYLESS-GO, use the key instead of the Start/Stop button.
► Depress and hold the brake pedal.
► Shift the automatic transmission to
position N.
► Release the brake pedal.
► Release the parking brake.
► Leave the SmartKey in position 2 in the
ignition lock.
Installing/removing the towing eye
Installing the towing eye
Vehicles with a trailer tow hitch: if possible
secure the towing device on the trailer tow
hitch.
► Remove the towing eye from the vehicle
tool kit.
WARNING&nbs ...
Transporting the vehicle
The towing eyes or trailer tow hitch can be
used to pull the vehicle onto a trailer or
transporter if you wish to transport it.
► Turn the SmartKey to position 2 in the
ignition lock.
...
See also:
General Information
Your vehicle is an important investment. This section describes the required
maintenance for the vehicle. Follow this schedule to help protect against major
repair expenses resulting from neglect or ...
Checking the coolant level
Only check the coolant level when the vehicle
is on a level surface and the engine has cooled
down.
► Turn the SmartKey to position
2 in the ignition lock.
On vehicles with KEYLESS-GO, ...
System fault
If a fault is detected in the HDC system, HDC FAULT SYSTEM NOT AVAILABLE will
appear in the message center.
If the fault is detected while the system is operating, HDC assistance will fade
out.
...
