I have a 1993 LS400. Starting last week, every time I turn the ignition key off, pull it out of the ignition, and open any door, the warning bell rings about 6 times. It sounds like the warning bell when the headlights when you inadventently leave on your headlights. I tried resetting the system by temporarily disconnecting the battery, checked all the doors, and ensured the lights were off.
It's bugging the heck out of me. Any insight to what is causing this?