CITROEN DS3 Handbook page 154

Reinitialisation of the system must be done with the ignition on and the vehicle stationary,
in the vehicle configuration menu.
Monochrome screen A
F Press the MENU button for access to the
main menu.
F Press the "5" or "6" button to select
the menu Veh config, then confirm by
pressing the OK button.
F Press the "5" or "6" button to select the
"Reinit inflat", menu, then confirm by
pressing the OK button.
A message is displayed to confirm the
instruction.
F Confirm by pressing the OK button.
Monochrome screen c
F Press the MENU button for access to the
main menu.
F Press the "5" or "6" button to
select the menu, "Personalisation-
configuration"then confirm by pressing
the OK button.
F Press the "5" or "6" button to select the
"define vehicle parameters" menu, then
confirm by pressing the OK button.
F Press the "5" or "6" button to select
the "Tyre pressures" menu, then the
"Reinitialisation" menu, then confirming
by pressing the OK button.
A message confirms the reinitialisation.