lexus is220 keyless problem

[lush29]

hi all,
have an is220d 2007,and car is loosing the key less memory,i program new key was ok till next morning and after that remote and keyless will not work anymore i have to keep the key near start button to start the car.
car come in like that and i thought is a key problem,so i made one,now i have 2 keys and still loosing keyless memory over night.
any ideas please? as i do to many luxes here,i think maybe is the bcm, but need some advice from someone with more experience in Lexus.
i scan the car with avdi and no faults anywhere.
please help.thanks

[lush29]

Anyone please?


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[BestElectrical]

Are you sure your door lock receiver is good?
Smart key should not lose data unless you have a bad Smart Key module.

[lush29]

Are you sure your door lock receiver is good?
Smart key should not lose data unless you have a bad Smart Key module.

Door locks are fine. I program remite keys, works for few hours and after that same thing will not start on keyless anymore. Where is keyless module on this located? Thanks


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[lush29]

where is the door lock receiver and the smart key module located?thx