Hey there. When I bought one of my cars used I got two sets of keys. The second one does not function(it never worked) replaced the battery same thing. I see the red led though. Since I have Techstream now how can play with it regarding the key setup. ? I know that I can not program a key unless it is a bran new one. I just would like to know is there a way to diagnose the second key since it belongs to the car ?
nope. The second key looked brand new but I didn't try at time of purchase. The second one came attached with the small metal plate and tag with car model color and VIN. The car was corporate car so I didn't think somebody was trying to trick me. As a matter a fact the second key was handed to me 2 days after the purchase( since they couldn't find it). But back to the problem. I solved it . Just launched Techstream and saw the option to register keys so I gave it try. I was surprised that it shows that there is only one key registered which is the working one, so I followed the process and BAM now the second key is working. I have no idea why this key was never registered to the car. Yep. This was the thing that was saying to me that this key belongs to this car, but again I have no idea why it wasn't registered at the first place.
More likely, they get screwed at the stealeship. Your Techstream software/ hardware is OEM or the ebay counterpart at lower cost?
I will be trying something else later. You have the erase option as well on techstream. So that key is erased now I am back to the one that always works and the car registers one key . I will try to register that second key to my other Prius.
Once you've programmed a fob, it's locked to the single vehicle. In order to program it for another vehicle you'll have to do a "seed reset" in techstream and register the fob as the first one. Dealers and some locksmiths have access to the password required to do a seed reset - you do not. See Will one SKS fob run two priuses? | PriusChat for more.
The OP must have gotten a virgin key. No way you car pair a used fob to another car without a seed reset.
This makes sense. Consider the following sequence: 1. Seller couldn't locate the second fob, so they removed it from the car database. Agrees with the statement that only one fob was registered. 2. Seller finds second fob. Since it was originally programmed for that car, the correct vehicle id is in the fob. But the car no longer has it in its database. 3. Buyer registers the second fob. Since the vehicle id already matches, no seed reset is required. The registration succeeds. So you can register a used fob without a seed reset. Just be sure to use a fob that originally came with the car...
Or.. Seller buys a virgin key and has the intention to program it but sells the car.. This makes sence since the key doesn't show any signs of use.. But your point makes more sense since the car had only one registered key in the system...every car should have two, am I right? ... Or seller looses the second key asks dealer to erase it from the system using the main key and buys a new one and never registers it.
