A step-by-step guide to replacing the factory cassette radio in a Corolla with a mp3- WMA- CD player and radio.
Select the replacement audio. You can obtain CD player with mp3 and WMA from Walmart for $89. The most important features are the ability to play mp3 and WMA format files burnt on a CD but also from a USB drive
(thumb drive or removable hard drive). Also has an aux port for mp3 players like the iPOD. This was way better in price features than anything else out there.
These instructions were originally posted by me on http://www.wikihow.com/Update-a-Toyota-Corolla-Car-Radio.