Let me preface this by saying that this should work on 03-07 classic Delphi radios. As we all know, 03+ Delphi radios are VIN-locked and can only be swapped between vehicles if the radio has been programmed with that VIN. I purchased a radio back in December to swap in to my brother's 03 rcsb, as his OEM CD player no longer functioned. Also, I chose to get a radio with a cassette deck so I could easily add an aux input for his iPod. Seeing how he has still yet to take his truck to the dealership to get the radio programmed to his VIN, I began to wonder where the VIN information was stored at in the radio. With this curiosity, I took his old radio out today and began searching the main board for an EEPROM. As luck would have it, I found one in the middle of the board. I googled the information that I found written on the EEPROM and decided to remove it from the board to see what would happen. Since it was already VIN locked to his truck, I decided to try it in my 05. Believe it or not, it worked. With this in mind, I tore apart the new radio. Here are the steps to making it work. For starters, here is the radio that I am using. First things first, turn the radio over to the bottom and remove the bottom cover. (thanks for letting me steal your photo, Garrett! I forgot to take one.) Once you get the bottom off, remove the cassette player (if equipped). Under the cassette player is the main board of the radio. This "Cal-Err" message appears for about 2 seconds when the radio first receives power. This still allows the radio to retain the door chimes, presets, EQ and other features. I'll get some better photos tomorrow when I add the aux-input and button it up. Hopefully this will save you guys the $70 at the stealership to reprogram the radio.