Buzzer won't turn off-figured it out!!
 

Just finished replacing ignition switch on '89 560SEL and the key buzzer stays on constantly when the driver's door is open and no key in the ignition. Doesn't happen if the engine is running and everything else seems to be working fine. There is a buzzer wire on the side of the lock assembly, could I have put it on backward? would it be okay to disconnect the courtesy light switch in the door jamb, any problem with that until I need to pull the cluster for something else? Not so bad for in and out of the car, but it will drive me crazy if I need to do anything with the door open.

Thought about this all day, then it struck me. In the process of changing the ignition switch I accidently pulled the steering lock cylinder out-dropped it before I looked at it. It took a shile to figure out how to put it back in, correctly I thought. I think I must have it off by 180 degrees and the key buzzer switch is in constant contact with the flat side of the bottom of the ignition, causing constant on condition. Steering lock cylinder needs to be flipped 180 degrees.

Good news--found the problem. Bad news--now have to remove steering lock assembly to rectify. Oh well, it took me nine hours over 3 evenings to change switch, but only one hour to put it back together. Should be able to correct in 2 or 3 hours max, if not shorter. It won't be nearly as hard (or intimidating) now that I've done it. Experience is a great teacher.