Just did this on an RDS non-MP3 AM/FM CD unit out of an 03 Cavalier LS Sport (for my 04 Cavalier base) with a few ill-side effects. Maybe it was just the way I did it. The unit works (with the CAL ERROR display). The screen shows the tape icon (tho there is no tape player). The CD button doesn't function properly, and over a long period of time, it doesn't remember my radio stations or sound settings. The time, and CD position did however stay in memory. Overall, It works so I'm happy, my base CD player got busted up and stopped working.