Coupling up a trailer

Observe the maximum permissible trailer dimensions (width and length).

Most U.S. 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 state.
    If the trailer detaches from the towing vehicle, the safety switch applies the trailer's brakes.

system of the towing vehicle, as the latter is equipped with an anti-lock brake 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 connection to the brake indicator lamp.

  • Make sure that the automatic transmission is set to position P.
  • Apply the vehicle's parking brake.
  • Close all doors and the tailgate.
  • Couple up the trailer.
  • Establish all electrical connections.
    See also:

    Folding the exterior mirrors in or out electrically
    - Make sure that the SmartKey is in position 1 or 2 in the ignition lock. - Briefly press button 1. Both exterior mirrors fold in or out. Make sure that the exterior mirrors are always fol ...

    Transfer case
    The vehicle has permanent 4-wheel drive (4MATIC). Power is always transmitted to both axles. Performance tests may only be carried out on a 2-axle dynamometer. The brake system or transfer ca ...

    SmartKey
    0. To remove the SmartKey (shift the transmission to position P) 1. Power supply for some consumers, such as the windshield wipers 2. Ignition (power supply for all consumers) and driv ...