Mercedes-Benz CLS Operator's Manual page 244

Use the trailer hitch only for pulling a
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trailer or attaching approved carrier sys-
tems (e.g. a bicycle rack).
Exception: Since vehicles with a trailer
hitch do not have a fixture for a towing
eye at the rear, towing or tow-starting is
permitted.
When towing or tow-starting with the
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trailer hitch, observe the information in
the section "Fitting and removing the
towing eye."
Extending the ball neck fully electrically
Secure the vehicle against rolling away.
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Keep the swivel range free of objects.
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Remove the trailer cable or adapter plug.
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Pull button 2.
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Indicator lamp 1 will flash and the message
Trailer coupling extending...
instrument display.
The ball neck will extend fully electrically.
Wait until the ball neck has locked in place.
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When indicator lamp
ball neck is securely locked in place.
If the ball neck is not securely locked in place,
indicator lamp
Check trailer hitch lock
instrument display.
will appear on the
Driving and parking 241
1 is continuously lit, the
1 will flash and the message
will appear on the