Mercedes-Benz GL-Class: Decoupling a trailer - Trailer towing - Driving and parking - Mercedes-Benz GL-Class Owner's ManualMercedes-Benz GL-Class: Decoupling a trailer

WARNING While you are coupling or decoupling a trailer, 
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.

Make sure that the automatic transmission is set to position P.
Apply the vehicle's parking brake.
Start the engine.
Close all doors and the tailgate.
Apply the trailer's parking brake.

WARNING As soon as you disconnect the electrical 
As soon as you disconnect the electrical connection between the trailer and the vehicle, the vehicle will lower. To help avoid personal injury, make sure no one is near the wheel housing or underneath the vehicle before the electrical connection is disconnected.
When you decouple the trailer, the vehicle is temporarily raised because the springs are relieved of load. Be especially careful during this process, as you could otherwise injure yourself and/or others. Make sure that any persons remaining in the vehicle do not press the switches for vehicle level control or the ADS.

Remove the trailer cable and decouple the trailer.
Switch off the engine.

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