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Practical tips
Control lamp
3 Valid for: hybrid vehicles.
Indicat
or lamps and driver messages on the
instrument cluster display or infotainment
system:
The 12 V vehicle battery does not
charge. Stop safely!
●
The indicator lamp lights up red. Stop the
vehicle and switch off the ignition. Obtain
technical assistance.
Error: 12 V vehicle battery. En-
gine cannot be started. Go to the
workshop.
●
The indicator lamp lights up yellow. If the
ignition is swit
ched off, it is not possible to
start the vehicle again. There may be limita-
tions on the vehicle’s functions/stability. Con-
tact a specialised workshop immediately.
Low level of the 12 V vehicle
battery. Charge while driving.
●
The indicator lamp lights up yellow. Starting
capacity may be limited. If this driver mes-
sage goes out after a certain amount of time,
the vehicle's battery has recharged while
driving and reached a sufficient level. If the
driver message does not go out, take the ve-
hicle to a specialized workshop.
Replace the 12V vehicle battery.
Take the vehicle to a workshop.
●
The indicator lamp lights up yellow. The 12
volt vehicle battery has almost reached the
end of its useful life. Visit a professional and
request an inspection and replacement, if
necessary, of the 12-volt vehicle battery
›››
page 335.
Check the 12V vehicle battery.
●
The indicator lamp lights up yellow. The
connection between the electrical system
and the 12-volt vehicle battery does not work.
Get the electrical system checked by a pro-
fessional.
Error: 12-volt vehicle battery
diagnosis. Visit a workshop.
●
The indicator lamp lights up yellow. The
system that controls the 12-volt vehicle bat-
tery does not work. Get the electrical system
checked by a professional.
Checking the battery electrolyte
level
Fig. 230
Sight glass on the top of the 12 volt
batt
ery (schematic r
epresentation).
The electrolyte level should be checked reg-
ul
arly in high-mil
eage vehicles, in hot coun-
tries and in older batteries.
●
Open the bonnet and then lift the cover
that protects the front part of the battery
›››
in Working in the engine compart-
ment on page 322.
●
Check the colour display in the "magic eye"
on the t
op of the batt
ery. Ensure sufficient
lighting to clearly identify the colour shown in
the battery window. Never use flames or ob-
jects that burn without a flame as a light
source.
●
If there are air bubbles in the window, tap
the window gently until they disperse.
334
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