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294 Checking and refilling levels
Checking the electrolyte level of the vehicle battery
Fig. 176 In the engine
compartment: Remove
the cover from the vehi-
cle's battery
Fig. 177 In the engine
compartment: Unfold the
vehicle's battery hose
The battery's electrolyte level should be checked regularly in high-mileage
vehicles, in hot countries and in older batteries. Other batteries do not re-
quire maintenance.
Start-Stop systems (⇒ page 198) are equipped with a special battery label-
led “AGM”. For technical reasons, it is not possible to check the electrolyte
level of these batteries
Preparations
● Prepare the vehicle for work in the engine compartment ⇒ page 279
● Open the bonnet ⇒ page 279.
Opening the battery cover
The battery covers are different depending on the engine size of the vehicle:
● In the case of a cover: press the tab ⇒ Fig. 176
A
in the direction of the
arrow and pull the cover upwards.
● In the case of a hose: fold the cover to one side to remove ⇒ Fig. 177.
Checking the battery electrolyte level
● Make sure there is sufficient lighting to clearly recognise the colours.
Never use open flames or sparklers as a light source.
● Depending on the level of acid, the Magic eye on the top of the battery
will change colour.
Colour indicator Necessary operations
light yellow or col-
ourless
The electrolyte level of the vehicle's battery is too low.
Have the battery checked and, where applicable, re-
placed by a specialised workshop.
Black indication The electrolyte level of the vehicle's battery is correct.
WARNING
Working with the vehicle battery involves a risk of corrosion, explosions
and electric shock.
● Always wear protective gloves and eye protection.
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