Mercedes-Benz S-Class Owner's Manual page 296

294 Driving and parking
Press the ball neck in the direction of the
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arrow until it engages audibly behind the
bumper.
Indicator lamp 1 goes out and the message
on the multifunction display disappears.
Observe the information on the displays on the
instrument cluster:
Warning and indicator lamps (
→
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Display messages ( page 545)
→
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Coupling up/uncoupling a trailer
& WARNING Risk of injury from the vehicle
level being changed
Vehicles with level control system: the
vehicle level may be changed unintentionally,
e.g. by other persons. You may become trap‐
ped if you couple up or uncouple a trailer
while the vehicle level is changing. In addi‐
tion, other people could become trapped if
their limbs are between the vehicle body and
the tyres or underneath the vehicle.
When coupling up or uncoupling a trailer,
make sure that:
The doors or tailgate are not opened or
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closed.
You do not initiate the level control sys‐
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tem and do not operate the DYNAMIC
SELECT switch.
page 596)
Do not lock or unlock the vehicle.
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Requirements:
the ball neck must be extended fully electri‐
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cally and engaged in the securely locked
position.
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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The operation of the following systems depends
on the trailer being connected correctly:
Active Lane Keeping Assist
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®
ESP
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Parking Assist PARKTRONIC
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Active Parking Assist
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Blind Spot Assist or Active Blind Spot Assist
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Coupling up a trailer
* NOTE Damage to the vehicle battery due
to full discharge
Charging the trailer battery using the power
supply of the trailer can damage the vehicle
battery.
Do not use the vehicle's power supply
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to charge the trailer battery.
Remove the cover from the ball head and
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store it in a safe place ( page 135).
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Position the trailer on a level surface behind
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the vehicle and couple it up to the vehicle.