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Wait until the ball neck has reached the
#
swung-out position with a clear locking noise.
When indicator lamp
1
is continuously lit, the
ball neck is securely locked in place.
If the ball neck is not securely locked in place,
indicator lamp
1
will flash and a message
reading
Trailer coupling Check
on the driver's display.
Retracting the ball neck fully electrically
Remove the trailer cable or adapter plug.
#
Pull button 2.
#
Indicator lamp
reading
Trailer coupling in
on the driver's display.
lockwill appear
The ball neck will retract fully electrically.
Wait until the ball neck has reached the
#
swung-in locked position.
When indicator lamp
neck is securely locked in place.
If the ball neck is not securely locked in place,
indicator lamp
reading
Trailer coupling Check
on the driver's display.
Observe the information about the displays on the
driver's display:
Indicator and warning lamps (
R
Display messages (
R
1
will flash and a message
motionwill appear
1
goes out, the ball
1
will flash and a message
lockwill appear
page 729)
/
page 644)
/
Driving and parking 297
Coupling up/uncoupling a trailer
& WARNING Risk of injury due to a change
in vehicle level
Vehicles with AIRMATIC: the vehicle level may
be changed unintentionally, e.g. by other per-
sons. If you couple or uncouple the trailer dur-
ing this time, you may become trapped. In
addition, other people could become trapped
if their limbs are between the vehicle body and
the tyres or underneath the vehicle.
Observe the following when coupling or
uncoupling:
Do not open or close any doors or the
#
boot lid.
Do not initiate the level control system
#
and do not operate the DYNAMIC
SELECT switch.
Do not lock or unlock the vehicle.
#
The trailer will be correctly detected by the vehi-
cle only if the following conditions are met:
The ball neck is extended and engaged in a
R
securely locked position.
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