discharged or changed, you may find tha
t
system settings e.g. time, date, personal
convenience settings and programming
have been changed or deleted. Check and
correct the settings as necessary once the
12-volt vehicle battery has been suciently
charged.
Checking the electrolyte level of
the 12
-volt vehicle battery
Please refer to , and on page
312 and
and at the start of the
chapt
er on page 325.
The electrolyte level of the 12-volt vehicle
battery should be checked regularly in
high-mileage vehicles, in hot countries and
in older 12-volt vehicle batteries. The 12-volt
vehicle battery is otherwise maintenance-
free.
Preparations
1. Preparing the vehicle for working in the
engine compartment → page 313.
2. Open the bonnet
→ pa
ge 314.
Checking the electrolyte level (12-volt
vehicle batteries with battery window)
Fig. 202 Ba
ttery window on the top of the
12-volt vehicle battery (general guide).
Depending on equipment, it may be neces-
sary to remove an additional bracket in or-
der to view the battery window. An addi-
tional tool that is not included in the vehicle
toolkit is required for this purpose.
Ensure that enough light is available for you
to clearly see the c
olour indicator in the
round window on the top of the 12-volt ve-
hicle battery → Fig. 202.
The colour indicator in the round window
changes according to the electrolyte level
in the 12-volt vehicle battery.
The electro-
lyte level of the 12-volt vehicle battery
is too low. The 12-volt vehicle battery
should be checked and replaced by
a qualified workshop if necessary.
The electrolyte level of the 12-volt
vehicle battery is correct.
For technical reasons, you cannot check
the electrolyte level of 12-volt vehicle bat-
teries marked with
. Go to a corre-
spondingly qualified workshop to ha
ve the
12-volt vehicle battery checked.
WARNING
Any work on the 12-volt vehicle battery
c
an cause serious chemical burns, explo-
sions and electric shocks.
·
Always wear eye protection and pro-
tective gloves.
·
Never use naked flames or glowing ob-
jects as a light source.
·
Electrolyte is very aggressive. It can
burn the skin and can cause blindness.
When working with the 12-volt vehicle
battery, ensure that your hands, arms
and face in particular are protected
from acid spillage.
·
Never tilt the 12-volt vehicle battery.
Electrolyte may spill out of the battery
vents and cause chemical burns.
·
Never open a 12-volt vehicle battery.
·
If acid is sprayed into your eye or onto
your skin, rinse the aected area imme-
diately for several minutes with cold
water. Then consult a doctor immedi-
ately.
·
If electrolyte is swallowed, consult
a doctor immediately.
Light yellow or without c
olour
Black
326
Checking and refilling
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