Mercedes-Benz GLS 2020 Operator's Manual page 127

Pull cover 2 out by its top handle edge.
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Fold up the cap of socket 1.
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Using the 12 V socket in the front passenger
footwell
Requirements:
Only connect devices up to a maximum of
R
180 W (15 A).
Lift up socket cap 1.
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Make sure that no cables are running
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through or secured in the airbag deployment
area when using the socket. Also observe the
notes on airbag protection ( page 41).
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Seats and stowing 125
Using the 115 V socket in the rear passenger
compartment
& DANGER Risk of fatal injury due to dam‐
aged connecting cables or sockets
If a suitable device is connected, the 115 V
socket will be carrying a high voltage. If the
connecting cable or the 115 V socket is
pulled out of the trim or is damaged or wet,
you could receive an electric shock.
Only use dry and damage-free connect‐
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ing cables.
When the ignition is switched off,
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ensure that the 115 V socket is dry.
If the 115 V socket is damaged or gets
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pulled out of the paneling, immediately
have the socket checked or replaced at
a qualified specialized workshop.
Never plug the connecting cable into a
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115 V socket that is damaged or has
been pulled out of the trim.