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Checking and refilling levels 321
Safety First Operating instructions Practical tips Technical Data
Start-Stop systems page 223 are equipped with a special battery. There-
fore, it must only be replaced with a battery of the same specifications.
Disconnecting the vehicle's battery
If you must disconnect the battery from the electrical system, please note the
following:
x Switch off the ignition and all electrical equipment.
x The vehicle must be unlocked before disconnecting the battery, otherwise
the alarm will be triggered.
x First disconnect the negative cable and then the positive .
Connecting the vehicle's battery
x Before reconnecting the battery, switch off the engine, the ignition and
electric devices.
x First reconnect the positive cable and then the negative .
Different control lamps may light up after connecting the battery and
switching the ignition on. They will be turned off after a short trip at a speed
of between 15 - 20 km/h (10 - 12 mph). If the warning indicators remain lit,
please visit a specialised workshop to have the vehicle checked.
If the battery has been disconnected for a long time, it is possible that the
next service date is not displayed or calculated correctly page 64. Respect
the maximum service intervals permitted Booklet “Maintenance
Programme”.
Vehicles with the KESSY system ( page 86): If, after connecting the battery,
the ignition cannot be switched on, lock and unlock the vehicle from outside.
Then try to switch the ignition back on. If the ignition can still not be switched
on, request the assistance of a specialist workshop.
Automatic consumer disconnection
The intelligent vehicle electrical system automatically implements a range of
measures to prevent the battery from discharging when high demands are
made on it:
x the idling speed is increased so that the alternator provides more elec-
tricity.
x where necessary, the power of the most powerful consumers is reduced
or even completely disconnected.
x On starting the engine, the power supply from the 12-volt sockets and the
cigarette lighter may be interrupted for a short time.
The on-board management program cannot always prevent the battery from
running flat. For example, if the ignition is left on for a long period with the
engine off or if the side lights or parking lights are left on while the vehicle is
stationary.
Why does the battery run flat?
x When stationary for a long time without starting the engine, particularly if
the ignition is switched on.
x Use of electrical consumers with the engine switched off.
x If the auxiliary heater is running page 187.
WARNING
Incorrectly securing the battery or using the wrong battery can cause
short-circuits, fire and serious injuries.
x Always use only maintenance free batteries that do not run flat alone
and whose properties, specifications and size correspond to the standard
battery. The specifications are indicated on the battery case.
WARNING
A highly explosive mixture of gases is released when the battery is under
charge.
x The batteries should be charged in a well-ventilated room only.
x Never charge a frozen or recently thawed battery. A flat battery can
freeze at temperatures around 0°C (+32 °F).
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