I bought a new master key from lexus for my 2001 IS300 and since I like doing things myself I decided to program it myself since I've done it before with an ebay key. However, its been nothing but headaches and trouble.

First method I did was trying to program it the manual way with the throttle dance method blah blah etc. Firstly I could not get the car to program the master key as the security like would keep blinking after 1 minute in the manual method. However I tried programing the remote and that worked completely fine but can't get the immobilizer to program to start the car.

So with that problem aside I decided to do the techstream method and ordered a mini vci j2534 cable and downloaded techstream software that came with it (obv patched) After installing everything correctly (as I assume) and all the drivers installed I boot it up and try to program the master key but get hit with these errors when trying to do so (image below) at this point I'm super frustrated and have try going 10 times over making sure I did everything right and so far I'm stumped and don't know what to do. Ive even tried a different laptop and still nothing.

At this point might just have to let someone else do it or if any1 has suggestions for me as a beginner in ecu stuff but an expert in pcs PLEASE help

 

What OS on your laptop? I had issues with some. The communication was not good.