Volvo XC90 Owner's Manual page 437

Related information
Refilling coolant (p. 586)
•
Driving with a trailer (p. 441)
•
Preparing for a long trip (p. 427)
•
Battery drain
The electrical functions in the vehicle drain
the battery to varying degrees. Avoid using
ignition mode II when the engine is switched
off. Use ignition mode I instead, as this uses
less electrical current.
Note that certain accessories may also drain
power from the electrical system. Do not use
functions that use a lot of electrical current
when the engine is turned off. Examples of
such functions are:
blower
•
headlights
•
windshield wipers
•
audio system (especially at high volume).
•
If the starter battery voltage is low, a message
is shown in the driver display. The vehicle's
energy-saving function will then turn off or
reduce certain functions, such as the blower
and/or the audio system.
Charge the battery by starting the engine
–
and let it run for at least 15 minutes (driv-
ing charges the battery faster than letting
the engine idle).
Related information
Start battery (p. 595)
•
Ignition modes (p. 393)
•
STARTING AND DRIVING
Jump starting using another
battery
If the start battery is discharged, current from
another battery can be used to start the vehi-
cle.
Jumper cable connecting points. Engine compart-
ment appearance may vary depending on vehicle
model and equipment level.
To avoid short circuits or other damage, the
following steps are recommended when jump
starting the battery using another battery:
1. Put the ignition in mode 0.
2. Make sure the auxiliary battery (the bat-
tery used to jump start the discharged
battery) has a voltage of 12 volts.
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