Vehicle care
235
The warning message will disappear
after the engine has been started
twice without a voltage drop.
If the vehicle battery cannot be
recharged, have the cause of the fault
remedied by a workshop.
Replacing the vehicle battery
Notice
Any deviation from the instructions
given in this section may lead to
temporary deactivation or
disturbance of the stop-start system.
Charging the vehicle battery
9 Warning
On vehicles with stop-start
system, ensure that the charging
potential does not exceed 14.6 V
when using a battery charger.
Otherwise the vehicle battery may
be damaged.
Vehicle battery state of charge
function
The function guarantees longest
vehicle battery life via a generator
with controllable power output and
optimised power distribution.
To prevent discharge of the vehicle
battery when driving, the following
systems are reduced automatically in
two stages and finally switched off:
When the vehicle battery is being
replaced, please ensure that there
are no open ventilation holes in the
vicinity of the positive terminal. If a
ventilation hole is open in this area, it
must be closed off with a dummy cap,
and the ventilation in the vicinity of the
negative terminal must be opened.
Ensure that the battery is always
replaced by the same type of battery.
We recommend that you have the
vehicle battery replaced by a
workshop.
Jump starting 3 268.
Discharge protection
Battery voltage
When the vehicle battery voltage is
running low, a warning message will
appear in the Driver Information
Centre.
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auxiliary heater
heated rear and front window
heated steering wheel
heated mirrors
heated seats
fan
1. Switch off any electrical
consumers which are not required
for a safe ride, e.g. seat heating,
heated rear window or other main
consumers.
Stop-start system 3 156.
In the second stage, a message
which confirms the activation of the
vehicle battery discharge protection
will be displayed in the Driver
Information Centre.
2. Charge the vehicle battery by
driving continuously for a while or
by using a charging device.