CITROEN C4 Cactus Handbook & Instructions page 202

Practical information
Starting using another
battery
When your vehicle's battery is discharged, the
engine can be started using a slave battery
(external or on another vehicle) and jump lead
cables.
First check that the slave battery has a
nominal voltage of 12 V and a capacity
at least equal to that of the discharged
battery.
Do not try to start the engine by
connecting a battery charger.
Do not disconnect the (+) terminal when
the engine is running.
F Remove the plastic cover from
the (+) terminal, if your vehicle has one.
F Connect the red cable to the positive
terminal (+) of the flat battery A, then to the
positive terminal (+) of the slave battery B.
F Connect one end of the green or black
cable to the negative terminal (-) of the
slave battery B (or earth point on the other
vehicle).
F Connect the other end of the green or black
cable to the earth point C on the broken
down vehicle (or on the engine mounting).
F Start the engine of the vehicle with the
good battery and leave it running for a
few minutes.
200
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 until the engine returns to idle then
disconnect the jump lead cables in the
reverse order.
F Refit the plastic cover to the (+) terminal, if
your vehicle has one.
Before disconnecting the battery
Wait 2 minutes after switching off the ignition
before disconnecting the battery.
Close the windows and the doors before
disconnecting the battery.
Following reconnection of
the battery
Following reconnection of the battery, switch on
the ignition and wait 1 minute before starting to
permit initialisation of the electronic systems.
However, if problems remain following this
operation, contact a CITRoËn dealer or a
qualified workshop.
Referring to the corresponding section, you
must yourself reinitialise (depending on
version):
- the remote control key,
- ...