Lexus Troubleshooting Questions? Ask a Lexus Expert
Hi, I'm Greg (Indy-Tech).Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.Rgds Greg.
If you have a spare key please try this first .
But first disconnect the battery for 10 minutes ,reconnect lock all doors and then unlock with the keyfob .jump inside try and start no start try spare key .no start and light still on and flashing the system is refusing your key due to a malfunction with in the system.
Here you will need a mobile keysmith to check for malfunction codes in the security system , then if possible reprogram your key's..
Most case reprogramming your key will fix this issue .
Need further assistance with this issue then please get back to me with the reply box below .After rating there is no further cost for any other question relating this issue .Kind regards Greg