LS430 Smart key issue

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I know its been mentioned before but cannot find a simple solution. I bought a 2003 face lift  LS and swopped the car Battery from my GS430 , this is when the issue started. Smart key is not recognised by the car so I have to put into the ignition slot to start.The remote works as normal by locking buttons but smart is a no go ? I have checked the switch under the dash and that's ok. All was working until I changed the Battery. My gs430 sport is due for sale due to a bump so have now gone for the LS so far so good.

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