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  • CLA
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  • 03/2020
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Coupling/uncoupling a trailer
Requirements:

  • The ball neck is extended and engaged in a securely locked position.

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

  • Adapter plug

  • Adapter cable

The trailer will be correctly detected by the vehicle only if the following conditions are met:

  • The trailer is connected correctly

  • The trailer lighting system is in working order

The functions of the following systems will be affected by a correctly connected trailer:

  • Active Lane Keeping Assist

  • ESP® trailer stabilisation

  • Active Parking Assist

  • Blind Spot Assist or Active Blind Spot Assist

  • Drive Away Assist

  • Cross Traffic Alert

  • Reversing camera

  • 360° camera

  • AIR BODY CONTROL

  • AIRMATIC

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

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

Do not use the vehicle's power supply to charge the trailer battery.
Remove the cover from the ball head and store it in a safe place More.
Position the trailer on a level surface behind the vehicle and couple it up to the vehicle.
Open the socket cap.
Insert the plug with lug in groove on the socket.
Turn bayonet coupling to the right as far as it will go.
Let the cap engage.
Secure the cable to the trailer with cable ties (only if you are using an adapter cable).
Make sure that the cable is always slack for ease of movement during cornering.
Under the following conditions, a message may appear on the multifunction display even if the trailer has been connected correctly:

  • LEDs have been installed in 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 up to 180 W and to the power supply that is switched on via the ignition lock.

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.
NOTE Damage when uncoupling in a state of overrun

Uncoupling in a state of overrun can damage the vehicle.

Do not uncouple trailers with an engaged overrun brake.
Secure the trailer against rolling away.
Disconnect the electrical connection between the vehicle and the trailer.
Uncouple the trailer.
Place the cover cap on the ball head.
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