Mercedes-Benz GLS 2020 Operator's Manual page 252

250 Driving and parking
You do not initiate the level control sys‐
#
tem and do not operate the DYNAMIC
SELECT switch.
Do not lock or unlock the vehicle.
#
Requirements:
The vehicle is secured with the electric park‐
R
ing brake.
The transmission is in position j.
R
The trailer will be correctly detected by the vehi‐
cle only if the following conditions are met:
The trailer is connected correctly.
R
The trailer lighting system is in working
R
order.
The functions of the following systems are affec‐
ted by a correctly connected trailer:
Active Lane Keeping Assist
R
®
ESP trailer stabilization
R
Parking Assist PARKTRONIC
R
Active Parking Assist
R
Blind Spot Assist or Active Blind Spot Assist
R
Drive Away Assist
R
Cross Traffic Alert
R
Rear view camera
R
360° Camera
R
Vehicles without a level control system: the
ball head height will change depending on the
vehicle's load. In this case, use a trailer with a
height-adjustable drawbar.
Coupling up a trailer
* NOTE Damage to the 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
#
to charge the trailer battery.
Information about a suitable ball neck for
Mercedes-Benz vehicles can be obtained from a
qualified specialist workshop, e.g. an authorized
Mercedes-Benz Center.
Remove the cover from the ball neck mount
#
and store it in a safe place ( page 249).
/
Position the trailer on a level surface behind
#
the vehicle and couple it up to the vehicle.
Establish the electrical connection between
#
the vehicle and the trailer.
% Accessories can be connected to the perma‐
nent power supply up to 180 W and to the
power supply that is switched on via the igni‐
tion lock.
Decoupling a trailer
& WARNING Risk of being crushed and
becoming trapped when uncoupling a
trailer
When uncoupling a trailer with an engaged
inertia-activated brake, your hand may
become trapped between the vehicle and the
trailer drawbar.
Do not uncouple trailers with an
#
engaged overrun brake.