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Question

lexus is XXX XXXX alarm fault
locked the car with the remote key fob setting the alarm .went shopping and came back and the car would not unlock with the key fob . had to open with key in the door and wait for alarm to shut off then drive home . i have changed the battery in the key fob , still does not work and also the spare set does not open it either . can you help thanks charlie

Submitted: 153 days and 11 hours ago.
Category: Lexus
Value: $30
Status: AWAITING EXPERT REPLY
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Posted by Genchi Genbutsu 153 days and 9 hours ago.

Info Request

You do mean is300 don't you?

 

The other remote (the spare) is the battery good in it and did you try it several times?

 

Thanks

153 days and 9 hours ago.

Reply

no it is the is200 and i have put new batterys in both key fobs

Posted by Genchi Genbutsu 153 days and 9 hours ago.

Info Request

Are you located in Europe? It appears to be a european model Lexus.

 

Thanks

153 days and 9 hours ago.

Reply

yes in the uk

Answer

You Dealer (maybe local repair shop) should have a tester like this....

 

http://www.keyfobtester.com/

 

This will test the signal and how strong/weak the signal is. It would take all of 1-2 minutes to test and they shouldn't charge you but it will let us know if the remotes are the problem. And it will help us by not replacing parts that are good.

 

If they both test good then the problem lies in the keyless entry/security ECU. These computers have been known to go bad and it a simple replacement and program your old remotes to it. I'm not sure how much the ECU would be but I'd ask while you're there having the keyfob's tested.

 

Please click accept if I have been helpful. Thanks, Genchi

 

 

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Expert: Genchi Genbutsu
Pos. Feedback: 100.0 %
Accepts: 
Answered: 6/22/2009

Technician

Toyota Certified Master Diagnostic Technician, ASE Master Technician with L1 Advanced Engine

153 days and 8 hours ago.

Reply

Sorry no info no good

read a link on lexus owners club and reprogrammed the key fob and now working

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