CITROËN C4 Picasso Owner's Handbook Manual page 70

Access
Remote control problem -
reinitialisation
Following disconnection of the vehicle battery,
replacement of the remote control battery or
in the event of a remote control malfunction,
you can no longer unlock, lock or locate your
vehicle.
Place the mechanical key (integral with the
remote control) in the lock to unlock your
vehicle.
Place the electronic key in the reader.
Switch on the ignition by pressing START/
STOP.
The electronic key is fully operational again.
If the problem persists, contact a CITROËN
dealer or a qualified workshop as soon as
possible.
70
Changing the battery of the
electronic key
Battery ref.: CR2032 / 3 volts.
A message appears in the instrument panel
screen when replacement of the battery is
needed.
Unclip the cover using a small screwdriver
at the cutout.
Lift off the cover.
Remove the flat battery from its location.
Fit the new battery into its location
observing the original direction of fitment.
Clip the cover onto the casing.
Do not throw the remote control
batteries away, they contain metals
which are harmful to the environment.
Take them to an approved collection
point.