CITROEN C4 Handbook page 194

In the event of a breakdown
Automatic gearbox
Never try to start the engine by pushing
the vehicle.
Electric motor
Flat accessory battery
It is no longer possible to start the motor
or recharge the traction battery.
Precautions before working on the
accessory battery
Select mode P, switch off the ignition, check
that the instrument panel is off and that the
vehicle is not being charged.
Jump-starting another vehicle
Do not use the accessory battery to
jump-start another vehicle or to charge
another vehicle's battery.
Symbols
No sparks or naked flames, no smoking.
Always protect your eyes. Explosive
gases can cause blindness and injury.
Keep the vehicle's battery out of the reach
of children.
The vehicle's battery contains sulphuric
acid which can make you go blind or
cause severe burns.
192
For more information, refer to the
handbook.
Explosive gases can be present close to
the battery.
Accessing the battery
The battery is located under the bonnet.
For access to the (+) terminal:
► Release the bonnet by pulling the internal
release lever, then the external safety catch.
► Raise the bonnet.
(+) Positive terminal with a quick-release
terminal.
(-) Negative terminal.
Starting using another
battery
If the vehicle's battery is flat, the engine can be
started using a backup battery (either external or
from another vehicle) and jump leads or using a
battery booster.
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 electricity-consuming equipment
on both vehicles (audio system, wipers,
lighting, etc.).
Make sure that the jump leads are well away
from the engine's moving parts (fan, belt,
etc.).
Do not disconnect the (+) terminal while the
engine is running.
► Lift the plastic cover on the (+) terminal, if the
vehicle has one.
► Connect the red cable to the (+) terminal of
flat battery A (at the metal elbow), then to the
(+) terminal of the backup battery B or of the
booster.
► Connect one end of the green or black cable
to the (-) terminal of the backup battery B or of