First of all this is a problem I created my self. I had purchased a non OEM silver key fob. I was able to program it to the 2004 Prius smart key. I was using a Xtool D8 bidirectional scan tool. As exercise I wanted to gain more experience using the scan tool. This was a big mistake! What I did was erased all keys did the quick reset. Also on SKS smart key I erased all the keys and did the 16 minute reset multiple times. When I try and do a reset the count down timer has no wait time any more. The result is non of the SKS funtions work any more. Only two of the key fobs when placed in the dash slot will start the car. The third key will not program ether. Yes I'm in the rock and a hard place. How do I fix this situation? Will re-seeding fix both system? By the post I have seen by RobH, I think he may have the answers.
All is well in the land of Prius. Remember when I said This was because the Smart Key control module was already reset. This means no smart keys are registered. The second issue is that the procedure is different for the first key being added, verses adding additional keys. Since I had gone through adding key on multiple times, I didn't notice the difference. This was my fault! The result is I have 2 perfectly fully functioning smart key fobs. The casualty was third key fob is no longer accepted by the car. To answer the question. Yes, there is a limited number of times a key fob can be paired to a car. Moral of the story is "If it's working don't mess with it!"
I was able to program the third key. The third key had the case replaced twice. I neglected to do was transfer the transponder chip. Once moved over to the new case the key was able to be paired with the Prius.
I have issues with my Xtool D8 programming the smart key functions into car. I used the chicken dance method to this part. I suspect the procedure with just pushing the lock button is not correct.
Can I revive this thread? I'm having a similar issue. I bought a gen 2 with SKS and only one, silver logo fob. Silver logo fob starts car but neither SKS or lock/unlock buttons worked. Tried two new batteries. I have a working copy of Techstream v18. I recently bought a new non-oem, non-sks fob from Amazon and successfully paired the immobilzer so it will start the car. Can't get the fob portion working. Is there a separate step to match the fob unlock/lock function in TIS? I've read a bunch of threads and I'm getting close to doing this......Someone stop me if it's a bad idea: Techstream says I have two SKS keys registered. Can I just purchase a new SKS from Amazon and pair it even though I don't have a working original? Do I need to erase/reset all SKS keys? If I do that, will the immobilizer still work orwill my car not start? Just want to know what I'm getting into. My preferred option if it is feasible is to just pair the lock/unlock function of my new, non-sks fob to the car. I don't really care about the sks function. Can this be done? I know there's lots of threads here and I've read through quite a few and am having trouble finding a definitive answer to this situation.
First of all we need to confirm you have a smart key (SKS) prius. On the exterior driver's door thier will be a small square black button. Non smart key lock and unlock are not compatible with Smart key. To verify ID chip has been programmed to immobilizer, insert the key into the dash. If the immobilizer light goes out immediately. It's a master key. If it wait one second, it's a valet key. Note: Valet keys can not be used add additional keys. If the immobilizer light continues to blink, the key is not programmed to the immobilizer. Next step is to program the smart key transmitter into the SKS. When the key fob picks up signal from the car you will see the small red LED blink on the key fob. The key fob then transmits a signal to the car. If this is not happening the SKS system maybe turned off. The switch is located below the steering column. One is for the SKS. If a second switch is found this is for the Tire Pressure Monitoring system. You want the LED light on the key fob blinking. Test the key fob remotes to see if they are now working.
I don't believe the Gen 2 has master and valet keys. If it does, there is no mention of it in the owner's manual or the repair manual.
IF you have an SKS Prius but don't have at least one fully working SKS fob (and the fob batteries are good- the red led lights when pushing a button) - THEN you in effect have an "all keys lost" scenario. (This assumes that Techstream doesn't show any smart key or immobilizer faults). You cannot "add a key" to get SKS (& remote locking) functional. AFAIK, the only way forward is to erase all keys. Which disables the car. You then need to get a "seed" code from: a cooperative dealer, a well equipped locksmith, or a questionable website somewhere in Europe. That code allows Techstream to program the SKS fobs to the car. Posted via the PriusChat mobile app.
Erasing everything should be done only if all keys are lost. Bear in mind thier are immobilizer and smart key SKS. Immobilizer uses the RFID number stored in the black chip that's not on the circuit board of the keyfob. When you insert the keyfob into the dash. The immobilizer reads the number off if the RFID chip inside the key fob. If the number read matches what is stored inside the immobilizer then the car is allowed to start. When adding a smart key it's paired to the number that's stored in the immobilizer. When adding a smart key the key is inserted into the dash. This is how the key knows what number in the immobilizer to pair the smart key too. During the smart key programming prossess the lock and unlock buttons are pressed simultaneously for just over 1 second. The key fob transmitts a code to the SKS in the car that is used to identify the key fob. This is stored in the SKS system.
Sorry for the old thread bump but I am in a similar situation here and frantically doing research, haha. While doing the chicken dance to add a new fob to my SKS Gen 2, something went wrong and the SKS proximity features were LOST on the original fob. The buttons work but the proximity features do not. That isn't "fully working" obviously but if the buttons still work does the car have the data needed to add a new OEM remote with full functionality? I've seen a few people with this specific problem, proximity features lost, but I haven't yet found an authoritative solution... Besides opening my wallet at a dealer. I'd rather spend the money on tools, if the procedure is clear.
There is a SKS button under the steering wheel, by where you knee will be when you are in the driver's seat. Make sure you didn't accidently click that button off. You can try the basics of resetting the systems. Take the battery out of the FOB and put it back in after a minute. Do the same with the car if that does not work, remove the 12V negative for a minute and reconnect.
First we need to do verify that the SKS disable switch is not pressed in. It's located below the steering column. This switch needs to be in the out position. You may also have a TPMS switch, don't touch this switch. Since the key fob is able to lock and unlock the car we know that the key fob can transmit, and the car can recieve the signal . The prius has transmitters (Oscillator) on exterior doors, and inside the vehicle. These transmit a signal to the key fob. Then the key fob transmits a responce back to the vehicle. When the key transmits the LED light on key fob will blink. TESTING the Oscillators. Roll down the driver's door. Note: This is case something goes wrong. All doors closed and vehicle is locked. Standing next to the drivers door you should see the LED light blink once ever 2 seconds. This indicates the Oscillator is working. You could try the passenger door. The rear hatch only transmits once when rear door release is squeezed. Interior Oscillators test. Sit in the driver's seat. You should see the key fob light blink once every 2 seconds. You could also verify the key fob battery voltage is 3 volts or higher. Keys fobs that are programmed for slot to start the vehicle, when inserted into the slot will turn off the blinking immobilizer light on the dash.
