Battery, Checking
Battery with Visual Indicator, CheckingA/C System, Operating after Charging
Caution
If it is suspected that chemicals were added to the
refrigerant circuit to seal leaks, do not connect the
A/C service station and do not extract the refrigerant.
...
Indicator lamps and fuel gauge
Fig. 129 In the instrument cluster: Variants
A and B: fuel gauges for petrol and diesel. Variant C: fuel gauge for autogas
First read and observe the introductory information
and safety warnings 
Lit up
Needle position 
Possible cause †...
Checking the electrolyte level of the vehicle battery
Fig. 141 In the engine compartment: removing
the vehicle battery cover
First read and observe the introductory information
and safety warningsThe electrolyte level of the vehicle battery should be
checked regularly in high-mileage vehicles, in hot countries and in older vehicle
batteries. ...