DIY SKS Reprogramming?

They don't mention Prius anywhere in those descriptions. My guess is that if it works at all, then it is limited to programming the transponder function only. You can already do that without additional equipment using the instructions in the knowledgebase.

The SKS/Proximity function always requires that you press two keys (lock+unlock?) as part of the programming process. Since the instructions don't mention this step, I highly doubt that SKS is supported. I don't think their use of the term "smart" refers to SKS. It seems to refer to the electronic key function of a transponder.

The "4D" apparently refers to a specific transponder chip. They offer equipment that copies this transponder chip, which means that you could have an unlimited number of keys (all with the same electronic signature). Whether or not the Prius uses a "4D", I couldn't tell you.

 

I just went through getting a new smart key. The used ebay smart key could only be programed by my dealer to operate the ignition by inserting the key(no fob functions). Then, I tried an ebay key that the seller claimed was new with the same result. Next, I got a new smart key from the dealer for 10% off ($175) and it worked for all smart key functions. Programing fees varied from $170 to $40 at various dealers around here (cincinnati, OH). Good luck.

 

Please note that the Smart fob contains a counter that increments each time it is used. After the counter exceeds a certain value, the Smart ECU will not allow registration of that fob. This is why attempts to register a used Smart fob will usually fail.

Also note that registration of a Smart fob involves two separate systems: the immobilizer ECU and the Smart ECU. In the case where the fob will work only when inserted into the dashboard slot, this means that the immobilizer ECU has accepted the fob but the Smart ECU has not.