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Check and see do lights come on when not running. Most likely a dead battery, but jump it and it goes. Bad alternator not charging battery. No power, no go.
Are there any warning lights on in the dash, may a security warning light? If so you will need to reset the security system, refer to the owners manual or callthe local Lexus dealer for instructions.
Sounds as though when your battery died the engine imobiIiser locked down. YOU MAY HAVE TO HAVE THE CAR TOWED TO A LEXUS DEALER AND HAVE THE MASTER KEY AND OTHERS REPROGRAMMED TO THE IGNITION...BUT If you have your wallet key as well , try taking all to the airport. HOLD the card to the dash beside the ignition for at least 20 seconds, then try turning the key several times. I haven`t done an LS but the failsafe when a remote fails is to hold the key beside the ignition for at least 20 seconds .... Also try the lock routine, but I think the issue is in dash..security needing to reboot to your key. My understanding is that the lock routine re initialises the lock setstings when power is restored
Have the battery and charging system check first. Sounds like the Alternator may have stoped charging and discharged the battery. Hope this helps. Please leave feed back.
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