DashBoard Door/Boot Display

Hi Just bought A4 2.4 1999 T reg. and found that when the boot is open there is a display on the main instrument pod, showing (flashing) that the boot is not shut. I assume the same should happen and
flash if one of the doors is not shut properly. However none of the doors cause the display to flash, when a door is open.
Any suggestions for possible causes for the doors not indicating they are open?
Regards Henri

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