Well it all started about a month ago. For some reason, it seems like the number 3 in button in the radio preset option keeps on getting stuck. The radio out of the blue would just switch to that station and get stuck there. When I have it in another mode which doesn't show the preset radio stations, it would switch to that. The volume keeps on working during this, but everything else just freezes. Then I would wait a day and then it would partially start working again until it something triggers it to get stuck on that button. The radio works quality works fine. I was wondering what you guys thought. Do I need a new radio. If so, I wouldn't mind since i found out later with this radio that it doesn't play mp3's. One more thing, I need an aux input. I purchased the device from pioneer for this radio so I could play the sound on my tv. Is this peice interchangeable.
Thanks

 

Depending on what exact piece you got from pioneer for you tv to play sound, if its just an fm modulator than yes. if its a changer port-aux piece it should still work.
on the other question for the buttons on the radio...
i had a 9400 a couple years ago and it also developed some phantom problems
with the face. i had pioneer service it, it cost me $100 and got it back from them the same way i sent it to them. they didnt fix it. seeing as its an older radio already i would suggest picking up a new radio. you can get a nice new radio that will play mp3's and have an aux input. i have a clarion dxz555mp that i sell in my store at 169.99, so if you look around i would think you should be able to find a good unit that would fit all your needs for under $200.
hope this helps
Erik,
Sounds Car Audio