Mercedes-Benz GL-Class: Coupling up a trailer
WARNING
While you are coupling or decoupling a trailer,
make sure nobody locks or unlocks the
vehicle and/or opens or closes doors or the
tailgate.
The vehicle's level could change and you
could endanger yourself and/or others as a
result.
Make sure that you do not operate the ADS
button or the vehicle level control system
when coupling/decoupling the trailer.
Observe the maximum permissible trailer dimensions (width and length).
Most federal states and all Canadian provinces require by law:
• safety chains between the towing vehicle and the trailer. The chains should be crosswound under the trailer drawbar. They must be fastened to the vehicle's trailer coupling, not to the bumper or the axle.
Allow for enough play in the chains to facilitate turning tight corners.
• a separate brake system for certain types
of trailer.
• a safety switch for braked trailers. Check
the specific legal requirements applicable
to your federal state.
If the trailer detaches from the towing vehicle, the safety switch applies the trailer's brakes.
Do not connect the trailer's brake system (if featured) to the hydraulic brake system of the towing vehicle, as the latter is equipped with an anti-lock brake system.
Doing so will result in a loss of function of the brake systems of both the vehicle and the trailer.
The vehicle's wiring harness features a line to the brake indicator lamp.
► Make sure that the automatic
transmission
is set to position P.
► Apply the vehicle's parking brake.
► Start the engine.
► Select highway level.
► Vehicles with the adaptive damping
system: set ADS to AUTO or COMF.
► Switch off the engine.
► Close all doors and the tailgate.
► Couple up the trailer.
► Establish all electrical connections.
Vehicles with the AIRMATIC package:
with a trailer attached, the vehicle will always remain at highway level. When coupling up a trailer, please observe the following:
• if highway level has not been set
manually, the vehicle will automatically
sink to highway level as soon as it
reaches a speed of 5 mph (8 km/h).
• high-speed level is not available.
These restrictions apply to all accessories powered through a connection to the trailer power socket of your vehicle, e.g. a bicycle carrier.
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