Disconnecting, removing, charging,
reinstalling and reconnecting 12‑volt
battery
Disconnecting the 12-volt battery i
If the 12-volt battery is disconnected
or discharged
R turning the key in the starter switch
will have no effect
R the transmission will remain in park
position P
For more information see “Jump start-
ing” (Y page 200).
X Engage the parking brake.
X Move the gear selector lever to park
position P.
X Turn off all electrical accessories.
X Switch off the drive system.
X Open the passenger door.
X Move the passenger seat to the rear as far
as possible.
X Unscrew the carpet holder in the
passenger footwell (Y page 160).
X Lift the carpet. X
Unscrew fastening screw 0044counter-
clockwise.
X Pull footrest 0043sideways out of the vehi-
cle.
X Read and observe safety instructions and
precautions (Y page 197). !
Always disconnect the battery in the
order described below. Otherwise the
vehicle’s electronics can be damaged.
X Disconnect the battery negative lead
from negative terminal 0087.
Make sure the negative lead does not
come into contact with the positive lead.
X Remove cover 0085from the positive ter-
minal.
X Disconnect the battery positive lead.
Removing the 12-volt battery X
Unscrew battery mount 0083.
X Remove the battery support and bracket.
X Pull out the ventilation hose from the
battery.
Depending on battery arrangement in
your vehicle model, the ventilation hose
is located either on the left or right side
of the battery.
X Remove the battery.
Charging the 12-volt battery G
WARNING
Avoid creating sparks when charging the
battery as escaping gases are flammable.
Keep open flames away from the battery and
do not smoke.
Do not touch the battery terminal with metal
objects and do not remove the battery
charger’s terminal clamps until the battery
charger has been switched off and no fur- Batteries
199>> Practical hints.
Z
No. Accessory/Component Amperage Color
006D
CPC, shifter, brake force booster vacuum
pump 7.5 A Brown
006E
Coolant pumps 1 and 2, high-voltage battery 15 A Blue
006F
ESP
®
control unit 25 A Neutral
0070
Exterior lamp switch, turn signal lamp
switch, cockpit switch module, on-board
diagnostics socket, exterior rear view mir-
ror heating, anti-theft warning system,
rain-light sensor, charge level and power
gauges, central locking system, instrument
cluster, Tire Pressure Monitoring System
(TPMS), brake and turn signal lamps (left and
right) 10 A Red
0071
— — —
0072
— — —
0073
Safety circuit high-voltage battery 15 A Blue
0074
— — —
0075
Rear window wiper (coupé only) 15 A Blue
0076
ESP
®
control unit, EPS control unit, restraint
systems 10 A Red
0077
Electric drive components, engine control
unit, transmission control unit, on-board
diagnostics socket, sound generator 7.5 A Brown
0078
Air conditioning system, exterior rear view
mirror adjustment, washer pump, audio, seat
heating, wiper switch, cruise control, soft
top switch (cabriolet only), backup lamp 10 A Red
0079
Auxiliary power outlet 15 A Blue
007A
Left low‑beam headlamp 7.5 A Brown
007B
Right low‑beam headlamp 7.5 A Brown
007C
— — —
007D
Right high‑beam headlamp 7.5 A Brown
007E
Left high‑beam headlamp 7.5 A Brown
007F
Electric drive components 7.5 A Brown Fuses
209>> Practical hints. Z
