battery replacement Citroen DS5 HYBRID4 RHD 2014 1.G Owner's Manual

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Do not throw the remote control batteries away, they contain metals
which are harmful to the environment. Take them to an approved collection point.
Changing the battery of the
electronic key
Battery ref.: CR2032 / 3 volts. This replacement battery is available from a CITROËN dealer or a qualified workshop. 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.
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/S T O P. The electronic key is fully operational again. If the problem persists, contact a CITROËN dealer or a qualified workshop as soon as possible.