JUst got '99 LS with one master key so got another transponder key online and it came with instruction. Had the key cut and tried the instructions that came with the key. No luck. Tried the PDF instructions attached earlier in this thread and they are totally different from the instruction I got with the key. So now I'm really confused. In the PDF instructions, Section A, 2 and 3, are these steps done from inside the car or outside the car? In section B, I assume this part is done with the unprogrammed key but it doesn't say that anywhere. Has anyone, other than a Lexus technician ever programmed a key successfully? I think Lexus not only gives out bad instructions but also pays the online key sellers to send bad instructions so you have to go to Lexus and pay the money. But then, maybe that's just me and my frustration talking.
Thanks for any help and if you have programmed a key successfully, you are my idol!