You have to get a code for it. You can get from the internet ir Mitsubishi, but its not free.
No. Worst case scenario is you will have to reprogram any aftermarket Radio/DVD/Stereo.
for a stereo? go to the12volt.com
go to __the12volt.com __aojedam
go to installdr.com to see how to remove and install a stereo out of any car
driver side under steerling wheel panel
http://www.installdr.com/Harnesses/Mitsubishi-Wiring.pdf
The mitsubishi eclipse has never had a bose stereo your 01 gs came with an infinity stereo, if your car does have one it is because it is aftermarket. To remove it you simply take the 2 screws at the bottom of the face plate that covers the heating and radio then remove the 2 or four depending how big your stereo is and pull it out.
http://installdr.com/ try this site i think it has what u need
http://www.the12volt.com/installbay/stereodetail/1541.html
you match them with the same colors
This website has a lot of wiring for many cars including '92 Eclipse. http://www.modifiedlife.com/1992-mitsubishi-eclipse-car-audio-wiring-diagram/
All you need is a 4 digit code. You can call the general Mitsubishi number and give them your VIN and they should be able to give you the code to unlock it.