Volvo XC90 2018 Owner's Manual page 465

Overloading the starter battery
The electrical functions in the car load the starter
battery to varying degrees. Avoid using the igni-
tion position II when the car is switched off.
Instead, use ignition position I - which uses less
power.
Also, be aware of different accessories that load
the electrical system. Do not use functions which
use a lot of power when the car is switched off.
Examples of such functions are:
ventilation fan
•
headlamps
•
windscreen wiper
•
audio system (high volume).
•
If the starter battery voltage is low, a message is
shown in the driver display. The energy-saving
function then shuts down certain functions or
reduces certain functions such as the ventilation
fan and/or audio system.
In which case, charge the starter battery by
–
starting the car and then running it for at
least 15 minutes - starter battery charging is
more effective during driving than running
the engine at idling speed while stationary.
Related information
Starter battery (p. 604)
•
Ignition positions (p. 414)
•
Using jump starting with another
battery
If the starter battery is discharged then the car
can be started with current from another battery.
Attachment points for the jump leads.
When jump starting the car, the following steps
are recommended to avoid short circuits or other
damage:
1. Set the car's electrical system in ignition
position 0.
2. Check that the donor battery has a voltage of
12 V.
3. If the donor battery is installed in another car
- switch off the donor car's engine and make
sure that the two cars do not touch each
other.
STARTING AND DRIVING
4. Connect one of the red jump lead's clamps
to the donor battery's positive terminal (1).
IMPORTANT
Connect the start cable carefully to avoid
short circuits with other components in the
engine compartment.
5. Open the positive jump-starting point's cover
(2).
6. Connect the red jump lead's other clamp
onto the car's positive jump-starting point
(2).
7. Connect one of the black jump lead's clamps
to the donor battery's negative terminal (3).
8. Connect the black jump lead's other clamp
onto the car's negative jump-starting point
(4).
9. Check that the jump lead clamps are affixed
securely so that there are no sparks during
the starting attempt.
10. Start the engine of the "donor car" and allow
it to run a few minutes at a speed slightly
higher than idle approx. 1500 rpm.
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