jemenake

Hi All,

I've been trying to add some new keys to a 2004 RX330. I've got the keys cut and the lock/unlock remotes paired, but I'm having trouble with registering some of the immobilizer transponder chips.

Years ago, when I tried doing this with Techstream, I had no luck at all, and now my version of Techstream has expired, so I can't really even use that, anymore. Fortunately, I discovered that I can register new transponder chips with the following incantation:

• Insert a working master key into the ignition without turning 5x (remove it the first 4 times, but leave it in the last time)
• Open/close driver door 6x.
• Remove master key
• Observe "Security" light is solid
• Insert new key to be registered
• Watch "Security" light flash slowly for about 45-60 seconds until it goes out and then the new key will work.

This process worked for a swing-out key that I bought (where the transponder chip is molded into the handle), but it has failed for the more typical RX330 key where the transponder is a tiny chip the size of a TicTac which lives in a cavity of the remote housing. I've tried about 3 of the bag of 5 chips that I bought. I believe they're all 4D68 transponder chips.

So, here's where I need help: When I try to register one of those chips, the "Security" light flashes slowly for about 10 seconds, and then it switches to some error code. It's flashing TWO quick flashes, then a brief pause, and then ONE flash, and then a long pause.

Anybody have an idea what that 2-1 flash sequence means?

Margate330

Welcome to Club Lexus and your 1st post!

I have no idea what the security light blink codes are, hopefully somebody knows.

Here is what I do know.

Immobilizer is enabled: red security blinks at a slow steady pace. Car won't start.

Immobilizer is disabled: red security light is off. Car will start.

Do you have a key that will start the car?

jemenake

So, yes. I had one master key which could start the car, and now I have two because the process worked for a flip-out key (so both keys turn the security light off when I insert them). The same incantation doesn't work for any of my other chips, however.

So, I don't know if it's a problem with the version of the chip or if it's a problem with the list of registered transponder chips being full or what.

Margate330

Ok excellent, thank you for clarifying.
It can be either as you already suspect.

When I have time I will dig in too see if I have any info in my tech docs on this.

If anyone knows what the security like blinks codes are, please post it up.