WARNING“Quick-charging” the vehicle battery is dangerous and requires a special
charger and specialist knowledge.
CAUTION
On vehicles with the START/STOP system, the pole terminal of the charger must
not be connected directly to the negative terminal of the vehicle battery, but only
to the engine earth » page 188, Jump-starting in vehicles with the START-STOP
system .
Note
We therefore recommend that vehicle batteries be rapid charged by a specialist
garage.
Disconnecting or reconnecting
First read and observe the introductory information and safety warn-ings
on page 168.
The following functions are initially deactivated or are no longer able to operate
faultlessly after the vehicle battery has been disconnected and reconnected.
OperationOperating measureElectrical power window (operational faults)» page 40Enter the radio/navigation system code num-
ber» User manual of the radio
or » user manual of the naviga-
tion systemSetting the clock» page 12Data in the multifunction display are deleted.» page 13
Note
We recommend having the vehicle checked by a specialist garage in order to en-
sure full functionality of all electrical systems.
Replacing
First read and observe the introductory information and safety warn-
ings
on page 168.
When replacing a battery, the new vehicle battery must have the same capacity,
voltage, amperage and be the same size. Suitable vehicle battery types can be purchased from a specialist garage.
We recommend having the battery replaced by a specialist garage, where the
new vehicle battery will be installed properly and the original battery will be dis-
posed of in accordance with national regulations.
Automatic load deactivation
First read and observe the introductory information and safety warn-ings
on page 168.
The vehicle voltage control unit automatically prevents the battery from discharg-
ing when the battery is put under high levels of strain. This may be noticed from
the following.
› The idling speed is raised to allow the generator to deliver more electricity to
the electrical system.
› Where necessary, large convenience consumers such as seat heaters and rear
window heaters have their power limited or are shut off completely in the event
of an emergency.
CAUTION
■ Despite such intervention by the vehicle electric system management, the vehi-
cle battery may be drained. For example, when the ignition is switched on a long
time with the engine turned off or the side or parking lights are turned on during longer parking.■
Consumers that are supplied via a 12-V power socket can cause the vehicle bat-
tery to discharge when the ignition is switched off.
Note
Driving comfort is not impaired by consumers being deactivated. The driver is of-
ten not aware of it having taken place.
171Inspecting and replenishing
Fuses in the dash panelFig. 153
Underside of the dash panel:
Distribution board cover.
Fig. 154
Schematic representation of the fuse box for vehicles with left-
hand steering/right-hand steering
First read and observe the introductory information and safety warn-
ings
on page 191.
The fuses are located on the left side of the dash panel behind a cover.
› Carefully remove the cover in the direction of the arrow
» Fig. 153.
› After the fuse has been replaced, replace the cover in the dash panel in the op-
posite direction of the arrow so that the guide lugs are guided into the open- ings of the dash panel. Close the cover until it clicks into place.
Fuse assignment in the dash panel
No.Consumer1S-contact2START-STOP, air-conditioning system3Instrument cluster, headlamp beam adjustmentNo.Consumer4Control unit for ABS, button for START STOP5Petrol engine: Speed regulating system6Reversing light (manual gearbox)7Ignition, engine control unit, automatic gearbox8Brake pedal switch, clutch pedal switch9Operating controls for the heating, control unit for air conditioning sys-
tem, parking aid, control unit for cornering lights, radiator fan, washing nozzles10Windscreen Wiper and Washer System11Mirror adjustment12Control unit for trailer detection13Automatic gearbox control unit14Motor for halogen projector headlights with cornering light function15PDA navigation system16Electrohydraulic power steering17Light switch power supply18Mirror heater19S-contact20Alarm21Reversing light, fog lights with the function CORNER22Operating controls for the heating, control unit for air conditioning sys-
tem, parking aid, mobile phone, instrument cluster, steering angle
sender, ESC, vehicle voltage control unit, multifunction steering wheel23Interior lighting, storage compartment and luggage compartment, side
lights24Central control unit25Seat heaters26Rear window wiper27Telephone preinstallation28Petrol engine: AKF valve, Diesel engine: Control flap29Injection, coolant pump30Fuel pump, ignition, Cruise control system, operation of PTC relay31Lambda probe 192Do-it-yourself
No.Consumer32High pressure fuel pump, pressure valve33Engine control unit34Engine control unit, vacuum pump35Daytime running lights/radio for vehicles with START-STOP36Main beam37Rear fog light, DC/DC converter START-STOP38Fog lights39Air blower for heating40-41Not assigned42Rear window heater43Horn44Windscreen wipers45Central control unit for convenience system46Engine control unit, fuel pump47Cigarette lighter, power socket in the luggage compartment48ABS, START-STOP (DC/DC) converter ESP49Turn signal lights, brake lights50START-STOP (DC/DC) transformer, radio51Electrical power window (front and rear) - left side52Electrical power window (front and rear) - right side53Parking light = left side, electrical sliding/tilting roof54START-STOP (instrument cluster), alarm55Automatic gearbox control unit56Headlight cleaning system, parking light - right side57Left low beam, headlight range adjustment58Low beam on the right
Fuses in the engine compartmentFig. 155
Vehicle battery: Distribution board cover.
Fig. 156
Schematic representation of
fuse box in engine compartment
First read and observe the introductory information and safety warn-
ings on page 191.
› Press the securing clips on the fuse box cover together at the same time in the
direction of arrow
A
» Fig. 155 and remove the cover in the direction of arrow
B
.
› Release the fixtures in the openings
C
using a flat screwdriver and fold the
cover upwards in direction of arrow
D
.
Fuse assignment in engine compartment
No.Consumer1Alternator2Not assigned3Interior4Electrical auxiliary heating system 193Fuses and light bulbs
