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Hi there! The problem never really got fixed. I think it is the door locking mechanism because my key fob stopped working around the same time. Or it could be a problem with the electrical system that controls the dome lights. Here is the method I used to control the problem: 1. I removed all the bulbs from the dome lights and the door bases. 2. I always lock my car. Even if it is in the garage. (In the garage I keep my driver's side window open and toss the keys in the front seat). I always open your car door using my key, never the interior button. That will set off the alarm. 3. I invested in a really good Jump-and-Carry hand held battery jumper and keep it charged in my garage. If I forget to lock my doors and the battery runs dead, I can hook it up start the car with no problem. Then I toss it in the back seat just to make sure I don't get stranded at the mall. Please follow up if you figure out how to permanently solve this problem. I would really like to get it fixed. If you decide to have your door locking mechanism changed let me know if it worked. Miss Bret

I finally found the problem with the electrical system which was draining the battery in my 99 Lexus RX300. It came down to faulty wiring to the back dome light. I removed the burned-out bulb and the problem stopped. When I put a fresh bulb in, the light worked but the battery started draining again. I will have the fixture replaced and see if the problem persists. I hope this information helps someone else. Please reply to this posting if it does.

Hello, I have a 1999 RX300. About 4 months ago the battery started going dead after 48 hours on non-use. The battery was 3 years old and tested fine. I had it recharged and again...the car went dead. I had it replaced. Same thing. Since then I have had three different mechanics test every electrical system. All fuses were fine and nothing showed up on the diagnostic meter. I changed the Body Control Module. Still no luck. Some issues that occured around the same time the battery started dying were: My key fob would not work on the door lock system. My 6-disk CD player would not load one disk properly. My right-front ABS brake sensor went bad after the transmission was replaced last year. I have since had the ABS sensor replaced. Please give me suggestions or insight. I am willing to try anything at this point.

Hello, Electrical problem with my 1999 Lexus RX300. About 4 months ago the battery started going dead within 48 hours of non-use. I had the battery recharged and again...the car went dead. I had it replaced. Same thing. No matter what I tried the problem persisted. Since then I have had three different mechanics test every electrical system and circuit. All fuses were fine and nothing showed up on the diagnostic meter. I changed the Body Control Module. Still no luck. Finally I purchased a Jump-and-carry. Please give me any suggestions or insight. I am willing to try anything at this point.