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