After starting the engine with a discharged vehicle battery, or after the battery has been changed, system
settings (time, date, personal convenience settings and programming)may have been changed or deleted.
Check and correct the settings as necessary once the vehicle battery has been sufficiently charged.
Checking the electrolyte level of the 12-volt vehicle battery
Fig. 1 Battery window on the top of the 12-volt vehicle
battery (general guide).
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.
For technical reasons, you cannot check the electrolyte level of 12-volt vehicle batteries marked with . Go to a
qualified workshop to have the 12-volt vehicle battery checked.
Preparations
—Preparing the vehicle for working in the engine compartment (→ In the engine compartment).
—Open the bonnet (→ In the engine compartment).
—If fitted: Loosen the screw on the mounting bracket and remove the bracket from the 12-volt vehicle battery→
.
The mounting bracket is installed by following the same steps in reverse order.
Checking the electrolyte level (12-volt vehicle batteries with battery window)
—Ensure that enough light is available for you to clearly see the colour indicator in the round battery window on the
top of the 12-volt vehicle battery (arrow) → Fig. 1. Never use naked flames or glowing matter(e.g. cigarettes) as a
light source.
—The colour indicator in the round window changes according to the electrolyte level in the 12-volt vehicle battery.
Light yellow or without colour
The electrolyte level of the 12-volt vehicle battery is too low. The 12-volt vehicle battery should be checked by
a qualified workshop and replaced if necessary.
Black
The electrolyte level of the 12-volt vehicle battery is correct.
WARNING
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