When I turn the car off and get out, in a few seconds (5-10), the alarm goes off. Pressing the unlock button on the remote key stops it and I can them lock the car and set the alarm, but next time I start and stop the car, the same thing happens.
This started when some knucklehead (that would be me) left a light on and drained the battery all way to zero. I jump started it and the battery seems fine, but the alarm issue won't resolve.
A quick disconnect of the battery did not fix it and a longer disconnect (over 5 minutes) also did not. I also pressed the brake pedal while the battery was disconnected, for good measure.
It's a Lexus RX300, 1999 or 2000 model year.
HELP!!