Mercedes-Benz CLS Operator's Manual page 246

If the ball neck is not securely locked in place, the
Check trailer hitch lock message will appear on
the multifunction display.
Coupling up/uncoupling a trailer
& WARNING Risk of injury due to a change
in vehicle level
Vehicles with level control system: the vehicle
level may be changed unintentionally, e.g. by
other persons. If you couple or uncouple the
trailer during this time, you may become trap-
ped. 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
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boot lid.
Do not initiate the level control system
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and do not operate the DYNAMIC
SELECT switch.
Do not lock or unlock the vehicle.
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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
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securely locked position.
Vehicles with level control system: ensure the
R
vehicle is at the normal level (
Use the normal level in trailer operation. High-
level driving is not permitted in trailer opera-
tion on public roads.
Trailers with a 7-pin plug can be connected to the
vehicle with the following adapters:
Adapter plug
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Adapter cable
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The trailer will be correctly detected by the vehi-
cle only if the following conditions are met:
The trailer is connected correctly.
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The trailer lighting system is in working order.
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A correctly connected trailer influences, among
other things, the functions of the following sys-
tems:
®
ESP trailer stabilisation
R
Trailer Manoeuvring Assist
R
Active Lane Keeping Assist
R
Parking Assist PARKTRONIC
R
Active Parking Assist
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Blind Spot Assist or Active Blind Spot Assist
R
page 219).
/
Drive Away Assist
R
Cross Traffic Alert
R
Reversing camera
R
360° camera
R
AIR BODY CONTROL
R
Coupling up a trailer
* NOTE Damage to the starter battery due
to full discharge
Charging the trailer battery using the power
supply of the trailer can damage the starter
battery.
Do not use the vehicle's power supply to
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charge the trailer battery.
Secure the vehicle against rolling away.
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Driving and parking 243