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As far as I know the sensors are not infra-red but work on a volumetric basis - this is where there are sudden changes in the volume of the inside of the car - as a matter of interest had the sun just come up when at 5am as a change in temperarure will change the volume or pressure inside the car - sounds like one or more of the sensors has gone faulty and has become over-sensitive.
Currently in madnoel10's garage:
Honda Civic 1.4l