I have a 2007 prius and two key fobs, both of the silver logo variant. I'm the only owner for the car, and I got both keys at the same time from the dealer when I bought the car. There's been no additions to the car (i.e. no aftermarket add-ons). A few weeks back I noticed both keyfobs were reducing in their range. After a while I couldn't unlock / lock using the keyfob. About a week ago I noticed that I had to start putting the keyfob into the car, even though the SKS was on. Finally I had some time last night and replaced the batteries in the fobs, and now they don't seem to work 100%. What I can do: Use the key fob to lock/unlock via the push buttons. What I can't do: Start the car Thinking that I might need to re-program the SKS - I read the ]Finally! How to program a SKS key fob with SKS functionality" thread, but I'm not sure which of the two keys is the master key. I've tried the instructions but can't seem to get past step 9. I've tried to confirm my keyfobs but I don't get the confirmation. Also the 12 V seems to be dying (dimmer lights, etc) Any other ideas on what to try. Again - i have the two original keys that came with the car, and since i replaced the C3032 battery i can't start my car.