Mercedes-Benz E-Class Sedan 2012 Operator's Manual page 296

Features
294
X
Turn the SmartKey to position 2 in the
ignition lock.
X
To open: slide cover : forwards until it
engages.
X
Press in cigarette lighter ;.
Cigarette lighter ; will pop out
automatically when the heating element is
red-hot.
X
To close: press cover : briefly at the
front.
The cover moves back.
12 V sockets
Points to observe before use
The sockets can be used for accessories, e.g.
lamps or mobile phone chargers with a
maximum current draw of 180 W (15 A).
If you use the sockets for long periods when
the engine is switched off, the battery may
discharge.
X
Turn the SmartKey to position 1 in the
ignition lock.
i An emergency cut-out ensures that the
on-board voltage does not drop too low. If
the on-board voltage is too low, the power
to the sockets is automatically cut. This
ensures that there is sufficient power to
start the engine.
Socket in the front-compartment center
console
X
To open: slide cover : forwards until it
engages.
X
Lift up the cover of socket ;.
X
To close: press cover : briefly at the
front.
The cover moves back.
Socket in the rear-compartment center
console
X
Briefly press cover ; at the top.
The cover opens.
X
Lift up the cover of socket :.