Checking and refilling levels
●
Fires, sparks, open flames and smoking are
prohibited. When handling cables and electri-
cal equipment, avoid causing sparks and
electrostatic charge. Never short the battery
terminals. High-energy sparks can cause in-
jury.
● A highly explosive mixture of gases is re-
leased when the battery is under charge. The
batteries should be charged in a well-ventila-
ted room only.
● Keep children away from acid and batteries.
● Before working on the electrical system,
you must switch off the engine, the ignition
and all electrical devices. The negative cable
on the battery must be disconnected. When a
light bulb is changed, you need only switch
off the light.
● Deactivate the anti-theft alarm by unlock-
ing the vehicle before you disconnect the bat-
tery! The alarm will otherwise be triggered.
● When disconnecting the battery from the
vehicle on-board network, disconnect first
the negative cable and then the positive ca-
ble.
● Switch off all electrical devices before re-
connecting the battery. Reconnect first the
positive cable and then the negative cable.
Never reverse the polarity of the connections.
This could cause an electrical fire.
● Never charge a frozen battery, or one which
has thawed. This could result in explosions
and chemical burns. Always replace a battery
which has frozen. A flat battery can also
freeze at temperatures close to 0 °C (+32 °F). ●
Ensure that the vent hose is always connec-
ted to the battery.
● Never use a defective battery. This could
cause an explosion. Replace a damaged bat-
tery immediately.
● For vehicles with the battery in the luggage
compartment: Check that the battery gas
ventilation hose is securely attached. CAUTION
● Never disconnect the battery if the ignition
is switched on or if the engine is running.
This could damage the electrical system or
electronic components.
● Do not expose the battery to direct sunlight
over a long period of time, as the intense ul-
traviolet radiation can damage the battery
housing.
● If the vehicle is left standing in cold condi-
tions for a long period, protect the battery
from “freezing”. If it freezes it will be dam-
aged. Checking the electrolyte level
The electrolyte level should be checked regu-
larly in high-mileage vehicles, in hot coun-
tries and in older batteries.
– Open the bonnet and open the battery cov-
er at the front ››› in Safety instructions
on working in the engine compartment on
page 166
›
›› in Warnings on handlingthe battery on page 174. For vehicles with
the battery under the spare wheel, open
the rear lid and lift the floor covering. The
battery is located next to the spare wheel.
– Check the colour display in the "magic eye"
on the top of the battery.
– If there are air bubbles in the window, tap
the window gently until they disperse.
The position of the battery is shown in the
corresponding engine compartment diagram
››› page 168 . The location of the battery in
the lug g
age compartment can be seen in
››› Fig. 152.
The “magic
eye” indicator, located on the top
of the battery changes colour, depending on
the charge state and electrolyte level of the
battery.
There are two different colours:
● Black: correct charge status.
● Transparent/clear yellow: the battery must
be replaced. Contact a specialised workshop.
Charging and changing the vehicle
battery The battery is maintenance-free and is
checked during the inspection service. All
work on the vehicle battery requires special-
ist knowledge.
»
175
Technical specifications
Advice
Operation
Safety
The essentials
