Why doesnt my car start and the car alarm keep sounding after I replaced my 2002 RX300 battery?

Kim Menor

Asked by Feb 11, 2014 at 10:12 PM about the 2002 Lexus RX 300

Question type: Maintenance & Repair

Replaced battery on my 2002 RX300.  Now the car won't start. Everytime I turn the key the car horn/alarm stays on.

5 Answers


With the doors shut, insert the key into the drivers door lock. Lock and unlock the door 5 times. This should reset the system. If that doesn't work you should contact a qualified repair shop

Kim Menor

I tried locking and unlocking the door 5 times and the problem still persists.


Then you will have to call a locksmith to reset the anti theft system. He will come to you. The only other option is tow it to the dealer.

Kim Menor

Thanks for your help.


I don't think this is an interference engine. Which means if it breaks it doesn't trash the engine. Have a belt put on and it should start up.

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