So I was trying to figure out why my smart key would not be programmed to my car. It uses the 134.(something)kHz oscillation within the car. But would not get picked up by the car. So by checking the other working remote I found this problem. a TINY surface mount resistor link went open circuit. So I went and put another resistor from a donor board and fixed it and got it programmed to my 2005 Toyota Prius.