The door open beeper goes off constantly when either of the doors is open, even when the key is not in the ignition. Is this normal? It's really annoying.

 

I've had mine do that occasionally when I pull the key out of the ignition. If I put it back in momentarily, and then pull it back out again, it quits. I think something in the ignition switch is sticking and making the car think the key is still in there. Maybe lubing the switch would help it. Mine hasn't acted up enough for me to do that yet.