74 Dart ignition buzzer

I’m not sure if the 74 is different, but on my 71 Demon there is a little switch in the column that is activated by the key being inserted into the ignition. This is then looking for a ground thru the drivers side door jamb switch. Anywhere from the buzzer in the horn relay and the door switch it gets a ground will cause it to buzz with the door closed. I can’t explain it not buzzing in neutral.