Using the 230 V socket in the rear passenger compartment
DANGER Risk of fatal injury due to damaged connecting cable or socket
You could receive an electric shock when pulling the connecting cable or the 230 V power socket out of the trim, or if it is damaged or wet.
Use only connecting cables that are dry and free of damage.
When the ignition is switched off, make sure that the 230 V power socket is dry.
Immediately have the 230 V power socket checked or replaced at a qualified specialised workshop if it is damaged or has been pulled out of the trim.
Never plug the connecting cable into a 230 V power socket that is damaged or has been pulled out of the trim.
DANGER Risk of fatal injury due to incorrect handling of the socket
You could receive an electric shock in particular:
if you reach into the socket.
if you insert unsuitable devices or objects into the socket.
Do not reach into the socket.
Only connect suitable devices to the socket.
Requirements:
Only connect devices with a suitable plug which conforms to the standards specific to the country you are in.
Do not use multiple socket outlets.
Only devices up to a maximum of 150 watts (0.65 A) can be connected.
Vehicles with a rear bench seat or electrically adjustable outer seats in the rear
Vehicles with individual rear seats
Vehicles with a rear bench seat or electrically adjustable outer seats: open the electronics compartment in the rear centre console.
Vehicles with individual rear seats: open the stowage compartment in the rear centre console.
Open flap 
.
. Insert the plug of the device into 230 V socket 
.
. When the on-board electrical system voltage is sufficient, indicator lamp 
lights up.