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.
Step 1: Preparing the wiring harness
Have shown the back of the new radio - the black set of pins is where the included black plug will go to. The free wires on the black plug provided with the new audio system will be connected to an adapter that will plug into the car wiring.
For the Toyota Corolla 1995 wagon, the wiring diagram is as shown below. Your car may differ substantially from this.