Fiat DOBLO Owner's Handbook Manual page 219

2. Clean the contact points with a soft
clean cloth.
3. Insert the coupling ball bar in the
opening and push firmly up to the
stop.
Secure the coupling ball bar correctly
by moving the lever to the locked
position, shown in the picture.
4. Lock the coupling ball bar by turning
the key. Remove the key and close
the protective flap.
5. Attach the trailer.
6. Fold the socket forward.
7. Connect the trailer plug to the socket.
8. Attach the breakaway stopping cable
to the eye on the carrier.
9
WARNING
Towing a trailer is permitted only when a
coupling ball bar is fitted correctly. If the
coupling ball bar does not engage
correctly, seek the assistance of a
workshop.
Dismounting coupling ball bar
1. Disconnect the trailer plug.
2. Unfasten the breakaway stopping
cable.
3. Remove the trailer.
4. Open the protective flap and unlock
the coupling ball bar with the key.
5. Move the lever of the coupling ball bar
to the rear position. Remove the
coupling ball bar by pulling it.
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