"door ajar" signal is lit

I see Dorman/Help has door jamb switches available for about $13, So call your local parts stores and see if they carry Dorman parts and the labor time to remove and replace this switch is about 3/4 of an hour

Usually its the drivers door because it's opened twice as often as the others

spray the door latches with wd 40 and open and close door a few times to lube also the back gate and window have switchs