The central locking in the Cressida just statrted playing up. When I unlock from the driver door lock or armrest button it unlocks then immeadiatly locks itself. If I use the passenger door lock it stays unlocked as normal, but if I try it again it stuffs up (so works, not work, works again.....?) It makes no difference if the engine is running or not, so I do not think it is battery voltage related. There is no alarm or remote central locking installed.