Annoyance

I have a 93 Cougar XR7 Special Edition and when you start up the car first of all the power seat belts dont work but the biggest annoyance is when you drive the car will just randomly start chiming as if the door was open too long and the door is shut and the door ajar light is not on. I ll do what it takes in order for this major dinging annoyance to stop. Sometimes if you turn the ignition just a little bit the dinging will stop but you cannot get it to stop at night when your lights are on. Please help !!! any assistance is greatful thank you.