my iq does beep beep

[Supertimor]

Hello everyone,
little problem on my iq this morning:
the car beeps constantly.
no particular witnesses, but I asked my wife to check if the 
doors and the trunk are properly closed.
Also if his belt is well put on.
She told me the car refused to lock.
But (according to her) the doors and trunk are really closed ...
I am thinking of a sensor that would no longer work, 
what do you think?

[dash]

Did you leave the keys inside the car? This would cause a beep-beep when you try to lock the doors and would explain why the car cannot be locked.