Mercedes-Benz S-Class Owner's Manual page 590

588 Display messages and warning/indicator lamps
Vehicle
Display messages
Possible causes/consequences and
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* The trailer tow hitch is not operational when you are driving with a trailer.
Check trailer hitch lock
(white display message)
Stop the vehicle immediately, paying attention to road and traffic conditions, and switch off the engine.
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Uncouple the trailer and secure it against rolling away.
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Initiate a new swivelling procedure (
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If the ball neck is extended, press and hold the button on the boot lid until the ball neck engages beneath the
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bumper.
When the display message disappears, couple up the trailer and drive on.
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& WARNING Risk of an accident if the ball neck is not locked
If the ball neck is not in the locked position, the trailer may come loose.
Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions.
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Do not continue driving under any circumstances.
Uncouple the trailer and secure it against rolling away.
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Initiate a new swivelling procedure and do not re-couple the trailer until the display message disappears.
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If the display message does not disappear, the trailer tow hitch is defective 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
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unlocked ball neck.
Consult a qualified specialist workshop.
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M M Solutions
page 292).
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