Volvo XC40 Owner's Manual page 399

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.
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.
3. If the auxiliary battery is in another vehicle,
turn off that vehicle's engine and make
sure that the vehicles are not touching
each other.
4. Clamp the red jumper cable onto the auxil-
iary battery's positive (+) terminal (1).
CAUTION
Connect the jump cable carefully to pre-
vent short circuits with other components
in the engine compartment.
5. Fold back the cover over your vehicle's
positive (+) jump start terminal (2).
6. Clamp the other end of the red jumper
cable to your vehicle's positive (+) jump
start terminal (2).
7. Clamp the black jumper cable onto the
auxiliary battery's negative (-) terminal (3).
8. Clamp the other end of the black jumper
cable to your vehicle's negative (-) ground
point (4).
9. Make sure the jumper cables are securely
attached to help prevent sparks while
jump starting.
10. Start the engine of the assisting vehicle
and let it run for a few minutes at a higher
idling speed than normal, about
1500 rpm.
STARTING AND DRIVING
11. Start the engine of the vehicle with the
dead battery.
CAUTION
Do not touch the connections between the
cable and the vehicle during the start
attempt. Risk of sparking.
12. Remove the jumper cables in the reverse
order ‒ first the black cables and then the
red cables.
Make sure that none of the clamps of the
black jumper cables come into contact
with either vehicle's positive (+) jump start
terminals or either of the red jumper
cable's connected clamps.
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