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  • E-Class
  • Saloon
  • 09/2016 - 11/2017
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Coupling up/uncoupling a trailer
WARNING Risk of injury from the vehicle level being changed

Vehicles with level control system: the vehicle level may be changed unintentionally, e.g. by other persons. If this happens when you are coupling up or uncoupling a trailer, you could become trapped. In addition, other people could become trapped if their limbs are between the vehicle body and the tyres or underneath the vehicle.

When coupling up or uncoupling a trailer, make sure that:

The doors or tailgate are not opened or closed.
Do not initiate the level control system and do not operate the DYNAMIC SELECT switch.
The vehicle is not locked or unlocked.
Requirements:

Before coupling up the trailer, the ball neck must extend fully electrically, securely engage and lock into place.

Trailers with a 7-pin plug can be connected to the vehicle:

  • adapter plug

  • adapter cable

In order for the trailer to be recognised by the vehicle:

  • the electrical connection must be set up correctly

  • the trailer lighting system must be in working order

The operation of the following systems depends on the trailer being connected correctly:

  • ESP®

  • Parking Assist PARKTRONIC

  • Parking Pilot

  • Blind Spot Assist or Active Blind Spot Assist

  • Active Lane Keeping Assist

Coupling up a trailer
NOTE Damage to the battery due to full discharge

Charging the trailer battery using the power supply of the trailer can damage the battery.

Do not use the power supply to charge the trailer battery.
Remove the protective covering from the ball head and store it in a safe place.
Position the trailer on a level surface behind the vehicle and couple it up to the vehicle.
Open the socket cover.
Insert the plug connector with lug into groove on the socket.
Turn bayonet coupling around clockwise to the stop.
Let the cover engage.
Secure the cable to the trailer with cable ties (if you are using an adapter cable).
Make sure that cable is always slack for ease of movement when cornering.
Check the trailer lighting system. Push the combination switch upwards/downwards and check whether the corresponding turn signal light on the trailer is flashing.
A display message may appear in the multifunction display even if the trailer has been connected correctly:

  • LEDs have been installed on the trailer lighting system

  • the current has fallen below the trailer lighting system's minimum current (50 mA)

Accessories can be connected to the permanent power supply and the power supply that is switched on via the ignition lock with maximum power consumptions of 180 W.

Uncoupling a trailer
WARNING Risk of being crushed and becoming trapped when uncoupling a trailer

When uncoupling a trailer with an engaged inertia-activated brake, your hand may become trapped between the vehicle and the trailer drawbar.

Do not uncouple trailers with an engaged overrun brake.
WARNING Risk of becoming trapped when disconnecting the trailer cable

Vehicles with level control system: the vehicle lowers when the trailer cable is disconnected.

This could result in you or other people becoming trapped if your or their limbs are between the vehicle body and the tyres or underneath the vehicle.

Make sure nobody is underneath the vehicle or in the immediate vicinity of the wheel arches when you disconnect the trailer cable.
NOTE Damage to the rear bumper from installing adapter cables or adapter plugs
The following parts could be damaged when retracting the ball neck fully electrically:

  • bumper

  • adapter cable

  • adapter plug

Always remove the adapter cable or adapter plug before retracting the ball neck fully electrically.
Safeguard the trailer against rolling away.
Disconnect the electrical connection between the vehicle and the trailer.
Uncouple the trailer.
Place the protective covering on the ball head.
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