I recently bought a 2001 PA with 140,000 miles. I didnt notice when I first drove it but the interior light doesnt come on when the driver side door is opened nor does the radio shut off when you are getting out of the car. All other doors do what they are supposed to

 

It sounds like your door ajar sensor (or whatever it's actual name is) is bad. It might just need to be cleaned.

 

How do we clean or replace the door ajar sensor?