How to fix light flashing on Ford Fiesta 1997?

When parked, even when unlocked the hazards flash for no reason. The door open warning light also flashes when driving when all door are definately locked. Possibly some connection with the car thinks the doors are open and therefore sets off the hazards that are connected to the alarm. Has anyone got any suggestions? The car is a 1997 Ford Fiesta Ghia X. Thanks