I suspect you have the same wiring, but as you may have noticed the JDM radio only tunes to 89.9 at the highest frequency and starts around 79.1.
Go into the library here on the site and download the factory service manual. This will allow you to see what wires are tapped into the harness and where those harness wires are "supposed" to lead to, IE +/- on each speaker, power constant (usually red), power switched (usually yellow), etc.
Double check the wires in the car, and that they match what is "supposed" to be the wiring setup per the original literature for the radio you are using. Most head units will use a very similar connector for the last 10-15 years for each brand but they are specific to each brand.
Confirm you haven't blown a fuse that may be attached outside the unit or inside the unit if not outside. This is usually only a problem if the unit will not power up.
Once wiring is confirmed, power it all back up things should work at that point.