Immobiliser Central Locking

[Ray_C5_2009]

Hi, I have a Citroën C5 Saloon 1.6 HDi VTR+NAV 4dr. My C5 has suddenly developed a fault on the central locking, nothing serious as the car still locks and unlocks. But there are two symptoms, i) the internal movement alarm inhibit switch/led does not function, ii) when activating the central locking the hazard lights flash about 1 minute after the car instantly locks. Otherwise the central locking is ok? I have tried leaving each of the doors and boot open and trying to locking, but as expected the car will not lock. The bonnet does not make any difference, open or shut the car still locks. Please help.