Replaced battery, Now factory alarm keeps going off

1996 LEXUS ES 300
80,000 MILES • 2.0L • 4 CYL • 2WD • AUTOMATIC
Avatar
JEFF BERGER
  • MEMBER
  • 1 POST
Only way to stop it was to disconnect the battery. I need to use the car so how do I reset this? I usually use just a key on the doors, no remote key. I do have the remote though. How do I reset this factory installed anti-theft system so I can use the car normally and stop irritating my neighbors and (especially) my wife?
Apr 3, 2017 at 7:49 AM
Advertisement
Avatar
HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
see link for a security system.
https://www.2carpros.com/articles/how-to-reset-a-security-system
Apr 3, 2017 at 10:19 AM
Avatar
STEVE W.
  • ✓ASE Certified Mechanic
  • 15,200 POSTS
  • ASE Certified Mechanic
Replacing the battery resets the alarm unit. Disconnecting the battery cable to stop the alarm doesn't work on this car, it actually just re-arms the alarm so it will go off again.
When it goes off you need to put the key in the ignition and turn it to the ACC. position. That will silent the alarm BUT will not reset the immobilizer so the starter will work. For that you use the remote or the key to lock, then unlock the car. The remote is usually the better option as it doesn't depend on the door switches.

Apr 7, 2017 at 9:19 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.