discharged or changed, you may
find
that
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
sufficiently
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
chapter 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
→
page 314.
Checking the electrolyte level (12-volt
vehicle batteries with battery window)
Fig. 202
Battery 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 colour indicator in the
round window on the top of the 12-volt ve-
hicle battery
→
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 have the
12-volt vehicle battery checked.
WARNING
Any work on the 12-volt vehicle battery
can 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
affected
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 colour
Black
326
Checking and
refilling
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