Reminder buzzer for key in ignition staying on while driving, plus interior lights as well stay lit as with ignition location light; Runs down battery when not in use.

I reckon it can only be three things;

The door switch because it signals that the door is open. Does the interior light come on when you open the door?

The microswitch in the ignition lock that identifies there is a key in the lock.

Or it needs reprogramming by the dealership.

Bad ignition switch. Have you done the recall?

there is a dimmer switch to dim the dash lights. when you turn it all the way over it turns the interior lights on it is the same switch as your headlights.

If you are getting a dinging then it is more than likely the drivers door.On my '98 the only door that causes the ding is the drivers door.

they are connected to the ignition switch on the outside of it.

One of the door pin switches is faulty, Interior light must be staying on and draining the battery. If you don't see the dome light staying on possibly the trunk switch is bad.

bad voltage regulator or bad alternater

inside the steering column locate the ignition remove wire to reveal screw to remove ignition that wire is what controls the buzzer and light itthe wire probrally wasnt in place correctly wich caused your problem

inside the doors is a Small twist in button switch on the door latch assembly that turns on the doom and key buzzer, they stick and make a poor connection, this causes your problem, i have replaced 100's of them, u will have to detrim the door to get at it. The switch is about $10 and u can get it from most parts stores, here is a picture. remember there is one on each door latch.