How do I get my iPod to work after changing the car battery in my 2006 Toyota Avalon.?

I have an aftermarket iPod system (or whatever you call it) installed in my 2006 Toyota Avalon. I was able to play my iPod using the AM/Satellite button. Ever since the car battery was changed, the button only goes to AM and not to satellite and the system no longer recognizes my iPod.|||Sounds like a computer problem. Take it to the Toyota dealership, they can hook it up to their computer and tell you. It shouldn%26#039;t cost anything, but some will charge to hook it up, it depends on the dealer.