ReplacingRead and observe
and on page 187 first.
The new vehicle battery must have the same capacity, voltage, current and thesame size as the original Battery. Suitable vehicle battery types can be pur-
chased 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
disposed of in accordance with national regulations.
Disconnecting and reconnecting
Read and observe
and on page 187 first.
Disconnecting
›
Switch off the ignition.
›
Disconnect the negative terminal first and then the positive
terminal of
the battery.
Connecting
›
Connect the positive terminal first, then the negative
battery terminal.
After disconnecting and re-connecting the vehicle battery, the following func-
tions or devices are partially or completely inoperative.
Function / deviceOperating measureElectrical power windows» page 60Panorama sliding/tilting roof» page 62Sun screen» page 62
Radio or navigation system
Enter code number » Radio
manual , » Infotainment radio
manual or » Infotainment navi-
gation manualTime settings» page 33
CAUTION
■ Disconnect the vehicle battery only with the ignition turned off - there is a
risk of damaging the electrical system of the vehicle.■
Under no circumstances must the battery cables be connected incorrectly –
risk of a cable fire.
Note■ After disconnecting and re-connecting the vehicle battery, we recommend
having the vehicle checked by a specialist to ensure that the full functionality
of all electrical systems is guaranteed.■
The data of the multi-function display will be reset.
Automatic load deactivation
Read and observe
and on page 187 first.
The vehicle voltage control unit automatically prevents the battery from dis-
charging when the battery is put under high levels of strain. This manifests it-
self by 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
vehicle 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
battery to discharge when the ignition is switched off.
Note
Driving comfort is not impaired by consumers being deactivated. The driver is
often not aware of it having taken place.190General Maintenance
