spyder24

Greetings,

The master key for my 2007 RX350 unlocks the doors fine; however, no longer can start the vehicle. Is it possible for the immobiizer chip to go bad? If so, can I reprogram this in techstream? If so, the only challenge I see is that I don't have another master key.

Thank you for your help!

spyder24

Bump

Can anyone please help? I'm a bit at a loss right now. Thank you!

Margate330

​​​Hi @spyder24 ,

1) Please sit in the car and put key in ignition.
What is the red blinking security light doing?

2) Turn the key to fully on but don't try to start it.

What us the red blinking security light doing?



Do you see the red blinking security light turn off?

spyder24

Hi @Margate330 ,

Thank you for getting back to me! I'm going off memory as I don't have the car at the moment. However, here is what I remember. The red security light blinks constantly with the key inserted and in the on position (i.e., nothing changes). When I use another key, the red blinking light stops and the vehicle starts fine. I had some issues with the battery a while back, and it's like the immobilizer chip on the original master key just stopped working. I'm wondering if there is something I can do in Techstream to get it working again?

I'd really appreciate any thoughts you have on this.

Regards,

Spyder24

Margate330

It sounds like there is something wrong with the RFID chip in your key since it was working and now doesn't work.

Since you have one key that works, this is good!

As long as you have a working key, you can get a new key made(with the correct rfid chip for our model car), and add it as a new key.

Please see this link for adding another key: https://www.clublexus.com/forums/rx-...rm-thread.html

If you do not have a working key to use as a master it will be much more complicated but having a key that works will act like a master to simply add new keys.

Also, the programmed key's rfid signature(with some math magic) are stored in the Transponder ecu as a list of allowed and authorized keys.

spyder24

Thank you for the wonderful information! I will give this a try.

JohnCone

Replying for the update.


spyder24

Well, unfortunately, this didn't work. It kept failing in Techstream when I tried to register a new key. I also tried the "pedal dance" method for a master and valet key with no dice.

For the techstream part, I wonder if I am hitting the two master key limit. I can try erasing all of the other keys; however, I have a CompuStar remote starter on the vehicle. By erasing the other master keys, will it break the remote starter?

Margate330

Please don't hold me to this but I believe all keys are "Master" keys except the valet key.

What I mean by Master is having one working key(not valet) and while using that key we program another key using the procedures in the link above.

Ps- I do believe there is a limit to how many keys can be programmed before needing to delete one to add another one. Plz be careful, don't delete your working key(Master) or it gets much more complicated.

All keys lost is a whole new level.