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Lexus gs300 alarm

I got a lexus 2008 model gs300, the car alarm just sudden sound up in d midnight. I used the remote to off it, not reaching 10 min it sounds up again, it keeps repeating until d third time i switch on d engine and off again. Until now it seems ok. What's the problem make d alarm sounds up??

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  • Cars & Trucks Master
  • 51,198 Answers

Check to see if you can adjust the sensitivity of the alarm as it may be temperature that is sending it off. If it m is a genuine factory fitted unit then have a talk to the service centre for clues. Also have you considered the possibility that an animal ( cat) is jumping on the bonnet to get warm from the engine heat

Posted on Jul 23, 2013


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SOURCE: car alarm sounds at random times some times after

If the alarm is for short period, it is just normal for
proximity sensor and vibration sensor types. If this alarm
for long period, then car alarm installation needs to be
checked by the technician installing the alarm. Send us your e-mail comment.

Posted on Oct 11, 2009

  • 1871 Answers

SOURCE: 1998 Lexus Gs300 alarm "anti theft system" arms

Hello! Lets eliminate a potential cause: There is a Technical Service Bulletin (EL-00198) that addresses key-ring interference with the Transponder Chip in the key...A touchy anti-theft system to say the least...The key-ring should not rest on or come in contact with the key grip area...Do not place any other keys on a ring with the ignition key...Actually, in order to function properly the ignition key needs to be *****...As in nothing on or near the key...I'm not saying this is your fault but it needs to be removed as a potential cause..See additional FYI information below on how to add or delete an ignition key from your vehicle's system...BELOW IS A LINK TO A SITE THAT HAS A BYPASS MODULE FOR YOUR Gs-300....Guru...Saailer


The Toyota Electronic Control Module does not have programming modes without a pre-programmed key.
If there is no key available that is already programmed into the module, the module must be replaced.

To delete all but one key from the unit:

Type E 1. Simultaneously depress and release brake and accelerator pedals 1 time.
2. Insert existing master key into ignition. Do not turn the key from the OFF (LOCK) position.
3. Within 15 seconds of inserting the key, depress and release the accelerator pedal six times.
4. Within 10 seconds of completing the above step, depress and release the accelerator pedal seven times.
5. The security light will flash, indication all keys other than the one being used have been deleted.
6. Remove the key from the ignition cylinder within ten seconds. It will be the only key still programmed to work

Add Duplicate Key:

1. Simultaneously depress and release brake and accelerator pedals 1 time.
2. Insert existing master key into ignition. Do not turn the key from the OFF (LOCK) position.
3. Within 15 seconds of inserting the key, depress and release the accelerator pedal five times.
4. Within 20 seconds of completing the above step, depress and release the brake pedal six times and
remove the key.
5. Within 10 seconds, insert the new key into the ignition.
6. Within 10 seconds, depress and release the accelerator pedal one time.
7. After 80 seconds the new key is registered and the security light will go off.
8. Remove new key and depress and release the brake pedal 1 time.

I’m happy to help further over the phone at

Posted on Oct 14, 2011

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