When I turn the key, all power comes on, but when the key is turned past the "on" position towards the "start" position, there is a single, almost-metallic click from the glove box area and the power goes off on the radio and cigarette lighter/power port.
The ignition switch has two switches. One sends power from the AM1 fuse to various things only when the key is in the ACC or On/Run position. The other sends power form the AM2 fuse to various things only when the ignition switch is in the On/Run or Start position. Everything that gets power when you turn the key to ACC (including the radio and CIG lighter) has power disconnected when they key is in the Off or Start position. This is normal, so having the radio lose power when you turn to Start is the way its supposed to behave
Frustrated wrote: I checked the AM2 fuse under the dash. It was blown and I replaced it and when I turned the key it blew the AM2 fuse again. What is going on??
The AM2 fuse is involved in a lot of circuits, ignition coils, alternator, starter, ECM, ABS, airbags, and probablyh some others. Most of these get power when the key is in either On/Run, and Start It looks like the only thing that is only powered when the ignition switch is turned to Start is the starting circuit. From the start terrminal of the ignition switch, it goes through the Park/Neutral start switch (or clutch to start switch if its a manual tranny} then through a TVIP relay (Toyota vehicle intrusion protection, I guess the factory anti-theft option), which then powers the coil of the starter relay.
So, you say that the AM2 fuse blows when you turn the key. Does it blow when you turn the key to the On/Run position, or only when you turn past that to the Start position?
If the fuse only blows when you turn to Start, then it could be a shorted or otherwise bad starter relay or Park/Neutral switch, ignition switch or some wire, or perhaps something else I didn't notice
If it blows when you switch to On/Run, then there's a lot more possible failure nodes.