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Discussion Starter #1
Howdy,

Anybody had any luck cutting and programming an aftermarket key blank to start the Prius. Does Toyota uses a Texas Instruments transponder chip in the Prius? I believe it is Texas Instruments if the information on page 68 of this ilco key catalog is true.

<http://www.keymachines.com/images/ilco/2001%20ILCO%20AUTOXREF.pdf>

Also, Texas Instruments has some good information about their transponders at:

<http://www.ti.com/tiris/docs/solutions/auto/autoApp.html>

The reason I bring this up is because I bought an after market Transponder key blank part number TOY43AT4 USA from a locksmith on ebay for about $22. Unfortunately it seems that the Prius will not accept this key. I'm beginning to think the information on pages 53 and 68 in the ilco key catalog is incorrect about Prius transponder key part number. I guess I should have detected something was amiss when I looked at the programming procedure they show on page 71 of the catalog. That procedure is definitely not the Prius programming procedure. The true Prius transponder key programming procedure is available at this link.

<http://www.coastaletech.com/keys.htm>

Anyway, does anybody know which Texas Intruments transponder chip is installed in the Prius key and what is the part number for an after-market Prius key blank that contains that chip? Also, if it's not a Texas Instruments chip but is really made by another semiconductor company I would be curious to know that as well.

Thanks,

Ed
 
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Oops,

I tried posting a link to the 2001 auto key catalog. I should have tried posting the 2002 auto key catalog.

<http://www.keymachines.com/images/ilco/2002%20ILCO%20AUTOREF.pdf>

If you have trouble with the above link you can also try this.

<http://www.keymachines.com/images/ilco>

Once there click on ... 2002 ILCO AUTOREF.pdf

The Prius info is on pages 49 and 63. The information is the same as in the 2001 catalog. I'm skeptical since I've not been able to program my TOY43AT4 transponder key.

Ed
 
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Ed,

I really doubt that there is any american-made chip of any sort in
the Prius. All of the electronics that I've looked at so far is all
Japanese manufacture. Not too surprising really.

Many of the components made by NEC and Fujitsu for example
also have export restrictions preventing their export from Japan
without a license. It is part of the effort to keep a lock on spare
parts and accessories.

[%sig%]
 
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I'm back with an update. Today I tried to program my ilco key blank part number TOY43AT4-USA. Success! This means if you want a spare key for your Prius you do not need to order from a Toyota dealer!

What was I doing wrong before? I was trying to program the key as a "sub" key but I was already at the Prius limit of two sub keys. Today I tried to program the key as a master and it worked fine. I now have a total of 6 keys for my Prius. I have 4 master keys and 2 sub keys.

http://www.keymachines.com/images/ilco/ ... UTOREF.pdf

Harry, my ilco key works and the ilco catalog at the above link claims this key contains a Texas Intruments transponder chip. Interesting.

Ed
 

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Information for programming and purchasing keys is at http://www.coastaletech.com/carkeys.htm They sell Ilco TOY43AT4 blanks with free shipping.I purchased three and took them to locksmith where they were cut then I programmed them all using online directions. http://www.coastaletech.com/keys.htm They have all worked well for weeks now and I like smaller head of key.Ilco blanks are also on eBay search under "transponder key".
 
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