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390 Display messages and warning/indicator lamps
Display messages
Head-up display currently
unavailable See Owner's
Manual
Head-up display inoperative
Possible causes/consequences and
If the ball neck has been extended: initiate a new swivel movement (
#
The ball neck will engage beneath the bumper.
If the display message does not disappear, the trailer hitch is malfunctioning and the ball neck is not locked.
Do not couple up the trailer. Drive on without the trailer. Note the reduced ground clearance due to the
#
unlocked ball neck.
Consult a qualified specialist workshop.
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* The head-up display is temporarily unavailable. Possible causes:
malfunctions in the power supply
R
signal interference
R
Stop the vehicle in accordance with the traffic conditions and switch the ignition off and on again.
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If the display message still appears, consult a qualified specialist workshop.
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* The head-up display has an internal error.
Consult a qualified specialist workshop.
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M M
Solutions
page 244).
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