Trailer Hitch: Service and Repair

Removing and Installing Control Unit for the Towbar







Removing the control unit for the towbar

WARNING:
Risk of destruction of electrical and electronic components.
- Before removing the control unit for the towbar, switch off the ignition and remove the ignition key.

Remove the side-panel lining at rear right.







1. Fold up the lock on the connector -arrow- and remove the plug.
2. Press connectors -arrow- together and pull apart.







3. Unscrew the fastening screw and lift the control unit up and out.

Installing the control unit for the towbar







1. Insert in the control unit into the holder and screw in the fastening screw.







2. Place the connector in position and press it in until it clicks into place.
3. Place the connector in position and fold up the locking bar until the locking bar clicks into place.

Install the side-panel lining at rear right.

Coding the control unit for the towbar

Extracting and changing the coding

NOTE:
- After the trailer hitch control unit is replaced, the coding must be customized to the vehicle equipment so that the control unit knows which trailer hitch is installed and which functions are desired or necessary.
- Automated folding/pivoting is synonymous with comfort closing in the power windows. Touching the button is sufficient to fold/pivot the ball hitch.
- The No automatic folding/pivoting option can be coded if there are doubts about safety. The button must be kept pressed until the trailer hitch is completely retracted or extended.
- With or without operating button; the operating button must be activated for the outwardly pivoting trailer hitch. This is of course not necessary for the detachable trailer hitch (ball hitch).

Versions or equipment features can be read out and reactivated under the Coding menu item.

The following options are possible:
- USN/North America
- RoW
- Trailer hitch with detachable ball hitch
- Trailer hitch with automatic folding out/swivelling the ball hitch Comfort tilt
- Without automatic ball hitch folding/pivoting, the switch/button must be pressed and held down

NOTE:
- When the coding is changed in the Coding menu item, the ignition must always be switched off afterwards and the key removed.
- After the ignition is switched on again, the new coding of the control unit is updated and the stored faults can be erased.
- if the coding does not match the vehicle equipment, faults will be displayed that are not really present.
- The control unit does not function without a valid coding entry.

Permissible combinations

NOTE: Ensure that only permitted combinations and existing versions are coded.