Starting Using Another Battery - CITROEN C5 AIRCROSS Handbook

In the event of a breakdown
For access to the (+) terminal:
F unlock the bonnet by activating the internal
release lever, then the external safety catch.
F raise the bonnet.
(+) Positive terminal.
It has a quick-release clamp.
(-) Negative terminal.
As the battery's negative terminal is not
accessible, a remote earth point is placed near
the battery.
Starting using another
battery
When your vehicle's battery is discharged, the
engine can be started using a backup battery
(external or from another vehicle) and jump
leads or using a battery booster.
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Never start the engine by connecting
a battery charger.
Never use a 24 V or higher battery
booster.
Check beforehand that the backup
battery has a nominal voltage of 12 V and
a capacity at least equal to that of the
discharged battery.
The two vehicles must not be in contact
with each other.
Switch off all the electrical consumers
on both vehicles (audio system, wipers,
lighting, etc.).
Make sure that the jump leads are not
close to the moving parts of the engine
(fan, belt, etc.).
Do not disconnect the (+) terminal while
the engine is running.
F Lift the plastic cover on the (+) terminal, if
your vehicle has one.
F Connect the red cable to the (+) terminal of
flat battery A (at the metal elbow), then to
the (+) terminal of backup battery B or the
booster.
F Connect one end of the green or black
cable to the (-) terminal of backup battery
B or the booster (or to an earth point on the
assisting vehicle).
F Connect the other end of the green or black
cable to earth point C on the broken down
vehicle.
F Start the engine of the assisting vehicle and
leave it running for a few minutes.
F Operate the starter on the broken down
vehicle and let the engine run.
If the engine does not start straight away,
switch off the ignition and wait a few moments
before trying again.
F Wait for it to return to idle.
F Disconnect the jump leads in reverse
order.
F Refit the plastic cover to the (+) terminal, if
your vehicle has one.
F Allow the engine to run for at least
30 minutes, by driving or with the vehicle
stationary, so that the battery reaches an
adequate state of charge.
If your vehicle has an automatic gearbox,
never try to start the engine by pushing
the vehicle.