can used key fob be reprogrammed by the car?

I've never tried that tool, but many of the cheap Chinese tools don't work with Prius. You're better off getting mini-VCI/Techstream and programming the fob that way, even if you have to buy a seedcode from someone like PinOnline Software

 

Kaptainkid1, do you still have at least one working fob for the car? If not I think you will have to pay lots of money at the dealer as I think you can only program a new fob yourself by using a working fob to program it. Others with more info will chime in with better information on steps you will need to take.
TomK

 

I have a back up sks key fob which works. I bought a used SKS key fob but I didn't think It would need a machine to program a used SKS key fob. Should have read this thread before buying a used key fob.

SM-J737T1 ?

 

I see mini VCI and tech stream tools on ebay for around $70. I'm not sure if these tools have the software for my Prius to reprogram my used SKS key fob. They say they have TIS which means?
Can I buy any ebay tools to reprogram used SKS key fobs?

Look at this on eBay
MINI VCI For TOYOTA TIS Techstream V9.30.002 with 22pin cable | eBay

SM-J737T1 ?

 

I think if your NEW key is a virgin key (meaning it has not ever been programmed) you can do the SKS full chicken dance and program it. At least that is the way I understand it.
TomK

 

I bought a new china knock off Virgin SKS Key from ebay. It cost $109 total shipped. Did the chicken dance and all the smart Key functions worked no problem.
The plastic case is a little cheap but you can swap out to an OEM key fob. Totally worth for $109 vs $300 OEM toyota dealership key.

SM-J737T1 ?

 

Nice! That is good info and glad it worked out for you and saved $200!
I got a hold of a used smart fob (but it doesn't matter smart of not) and did the first part of the programming so the fob starts the car in the slot and just had a hardware store cut a key. No smart functions but a really cheap solution.
TomK

 

silver backed fobs from dealer should be UNDER 130 bucks, lots of dealers sell for that price, i am getting one today. If your dealer is sticking it to you on a fob, they are making you their girlfriend on every thing you do with them.

 

I'm not sure where you got that idea as the MSRP for the SKS fob is currently $253.94 and a lot of online dealers will discount to around $185.

If you are seeing pricing at around $130 that would be the discounted price for a non-SKS fob.

If sellers are selling for a lot less than that, they are either cheap aftermarket knockoffs or are counterfeits.

 

Interesting find! So that means the 4D transponder chip will not be locked after programming! But there is some debate whether transponders from non-SKS carry a different ID (ID67 instead of ID70). While the transponder has nothing to do with the SKS system, any SKS Prius might not accept a transponder from a non-SKS key. Again, I don't have proof, it's just what I seem to understand from researching.

Edit: Further reading suggests that the transponder chip is more or less read-only. It just has to have the right data to be recognized as 4D70.

 

As far as I am aware, when you perform step A, it stores the RFID chip’s code in the car’s immobilizer; nothing is written to the chip. The RFID chip used in the non-SKS fob is the same as the one used in the SKS fob, which is why countless people have been able to use procedure A to match a black-logo fob to an SKS car and a silver-logo fob to a non-SKS car.

 

Seeing as this was posted in the Gen 2 forum, it’s a shame he basically glossed over and ignored the Gen 2 as being too hard.

I also disagree with some of what he said about how the system works in the Gen 2, as it is not borne out in real-life experience. I wonder if he was confusing the Gen 1 with the Gen 2 Prius when he was talking about the Gen 1 SKS system, supposedly used in the Gen 2 Prius.

 

Thx. There is still too much confusing/conflicting information here and there. I was under the impression the non-SKS uses 4D67 transponder, which is what I bought, but can't program to my 2005 SKS-Prius with the chicken dance. Now I don't know if the problem is the 4D67, that probably should be 4D70 (can't find those for sale in Germany), or if the problem is wrong data on page 1 of the 4D67. When I bought it it said "Toyota" but probably the data on page 1 is not the correct one.

Guess I'll have to find/get a VVDI to inspect what I have in my original silver SKS-key and what I have in the separate chip I bought. Or maybe I just get a used fob, program the transponder to my Prius, break it open and take the transponder out.

 

If they do use different chip, they are functionally the same so that is moot.

It is either blank (you say it is not), or it is incorrectly coded for a Gen 2 Prius.

That's what I would do.

FYI, the two codes the guy mentioned, one is in the chip and that is loaded in the immobilizer. The other comes from elsewhere in the security chain from within the car (I'm picking the vehicle ID), and that is paired to the immobilzer key ID record. Procedure A does the first bit and procedure B/C does the second bit.

All this next paragraph is speculation, on my part, I do not know if it factual, so take with a grain of salt. I'm not sure if Procedure B/C also writes the Key ID back to the circuit board, but for the key to fully work, that has to happen as the chip cannot transmit the Key ID until it is in the slot. If this does not happen then the way it could work is if the fob was pre-programmed with the same Key ID as the chip. If it is different to the chip ID, then the only way that could work is if the circuit board Key ID is stored in another field against the immobilizer key ID record.