Volvo S90 Owner's Manual page 595

Support battery
Cars with the Start/stop function are equipped
with two 12 V batteries - one extra powerful
starter battery for starting and one support bat-
tery that helps during the function's starting
sequence.
The support battery is located in a box next to the strut
tower.
Automatic starting can only take place if the gear lever is in neutral position.
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NOTE
The higher the current take-off in the car,
•
the more the alternator must be working
and the batteries charging = Increased
fuel consumption.
When the capacity of the battery has
•
fallen below the lowest permissible level
then the Start/stop function is disen-
gaged.
Temporarily reduced Start/stop function due to
high current take-off means:
The engine starts automatically
•
driver depressing the clutch pedal (manual
gearbox).
The engine starts automatically without the
•
driver lifting his/her foot off the foot brake
pedal (automatic gearbox).
The support battery normally requires no more
service than the normal starter battery. A work-
shop should be contacted in the event of ques-
tions or problems - an authorised Volvo workshop
is recommended.
IMPORTANT
If the following instruction is not observed
then the Start/stop function may temporarily
cease to work after the connection of an
external battery or battery charger:
The negative battery terminal on the car's
•
starter battery must never be used for
connecting an external starter battery or
battery charger – only the car's negative
charging point may be used as the
grounding point.
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without the
MAINTENANCE AND SERVICE
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