Problems with trailer towing
Problem
Possible causes/consequences and
M
M
Solutions
The unlocked ball cou-
pling cannot be
engaged.
X
Consult a qualified specialist workshop.
The ball coupling does
not unlock, even though:
R
the vehicle is station-
ary
R
no trailer cable is con-
nected
R
the release button to
unlock the ball cou-
pling has been pulled
for more than a sec-
ond
The on-board voltage is insufficient.
X
Start the engine.
If the ball coupling still does not unlock:
X
Consult a qualified specialist workshop.
Towing a trailer
231
Driving
and
parking
Z