So if I buy a junkyard ECU from another LX470 with master keys, will it just work?

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Mauser said:
The new chip will already have an ID. All the ecu does is record it.

If your ecu was reset and you programmed your existing valet key it should recognize it as a master. You should be able to exit programming mode by cycling the key on and off 5 times.
Click to expand...
Maybe because I tried the other wannabe master keys first it was ready to program a valet by the time I inserted it or something? I am wondering if I should just try it again...
 
nukegoat said:
Maybe because I tried the other wannabe master keys first it was ready to program a valet by the time I inserted it or something? I am wondering if I should just try it again...
Click to expand...

Maybe, but if you are still in registration mode I would just try another key or one of the keys you have with a 4D68 chip installed. The key doesnt have to be cut, it just has to go in the ignition switch a little bit.
 
I'm sorry if I am confusing you at all. Information passes from my brain to my hands without a problem so i can show people what I mean, but I suck at explaining anything.
 
Mauser said:
Maybe, but if you are still in registration mode I would just try another key or one of the keys you have with a 4D68 chip installed. The key doesnt have to be cut, it just has to go in the ignition switch a little bit.
Click to expand...
Makes sense to me. I'm surprised that the valet key isn't identifying itself as a master, though. Or maybe I'm misinterpretting the techstream "live data" - but I think the various true/false flags were suggesting it was not a master. Anyway - I'll give it another shot. Maybe I can just order some 4d68 chips off amazon and swap out the 4d67 in one of the keys. Is there any specifics to the 4d68 (I see other references like PG0-A1, PG1, etc) that I need to be aware of?
 
For example, What's the difference between TP30 and TP29?
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I'm not sure the difference, but I used the tp30
 
Mauser said:
I'm not sure the difference, but I used the tp30
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Would I be better off buying a couple of oem non-transponder lexus key blanks and gutting them for their chip, then installing the chip in my aftermarket transponder?
 
I have a 4d68 chip that works in a GX. It looks like the LX uses the same chip. I will be going to the Post Office in a little while to send some packages off, if you give me an address to send it to I'll drop it in the mail.
 
Mauser said:
I have a 4d68 chip that works in a GX. It looks like the LX uses the same chip. I will be going to the Post Office in a little while to send some packages off, if you give me an address to send it to I'll drop it in the mail.
Click to expand...
PM'd

At least I feel like I'm making progress. Getting keys cut was a royal pain - nobody around me wanted to do it, so I'm sort of stuck with these shells and blades now since my wife ended up having to pay some guy $150 to drive an hour down here to cut them for us. Anyway - if this works then it's another data point in the right direction
 
nukegoat said:
PM'd

At least I feel like I'm making progress. Getting keys cut was a royal pain - nobody around me wanted to do it, so I'm sort of stuck with these shells and blades now since my wife ended up having to pay some guy $150 to drive an hour down here to cut them for us. Anyway - if this works then it's another data point in the right direction
Click to expand...

Man, that sucks. Around here the cheapest I could get them cut was $35 each and I would have to drive an hour so I bought a duplicator. I know the chip I am going to send you can be programmed into a GX and from what I have read the GX and LX use the same transponder.
 
Mauser said:
Man, that sucks. Around here the cheapest I could get them cut was $35 each and I would have to drive an hour so I bought a duplicator. I know the chip I am going to send you can be programmed into a GX and from what I have read the GX and LX use the same transponder.
Click to expand...
Alright, well, whatever we learn will at least help others. So there's that. Thanks man!
 
Mauser said:
Man, that sucks. Around here the cheapest I could get them cut was $35 each and I would have to drive an hour so I bought a duplicator. I know the chip I am going to send you can be programmed into a GX and from what I have read the GX and LX use the same transponder.
Click to expand...
Boom. Worked flawlessly. Swapped chips and it accepted the new key like it was no thang. So you got that out of an oem gx470 key? Or was it a generic 4d68? I have one more key that I need to chip. Think I will order a 4d68
 
That got there quick.

That chip came from an aftermarket key I screwed up cutting. I cant remember the numbers on the chip, but when I googled them it came up as a 4D67 chip. I did a little more reading and youtube watching and saw that a lot of times different readers read the chip differently. Some will read a 4c as a 4d
 
Mauser said:
That got there quick.

That chip came from an aftermarket key I screwed up cutting. I cant remember the numbers on the chip, but when I googled them it came up as a 4D67 chip. I did a little more reading and youtube watching and saw that a lot of times different readers read the chip differently. Some will read a 4c as a 4d
Click to expand...
It had the same part number as the unreadable chip i took out. I think they are flashed with some encryption something or other (e.g. the difference between p0 and p2 and tp29 etc etc)
 
nukegoat said:
It had the same part number as the unreadable chip i took out. I think they are flashed with some encryption something or other (e.g. the difference between p0 and p2 and tp29 etc etc)
Click to expand...

Maybe that's the difference.

I got a few gift cards for Christmas yesterday so I ordered a key programmer that will read the chips. I may be able to offer eeproms with key transponder codes already written to them.
 
Mauser said:
Maybe that's the difference.

I got a few gift cards for Christmas yesterday so I ordered a key programmer that will read the chips. I may be able to offer eeproms with key transponder codes already written to them.
Click to expand...
Interesting. Want me to mail back the non working chip for science? Also - in the meantime do you remember the part number for the key you ordered?
 
nukegoat said:
OK. Can you PM me your address again? I didn't retain my envelope :(
Click to expand...

Forgot to send you my address. I got a tool to read the transponder chips. The Lexus uses a 4D67 tp29 chip and the Toyota uses the 4D67 tp30.
 
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