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My '03 with the CDR23 crapped out on me this spring. Like you said, working fine and then all of a sudden, nothing. Spent hours searching, reading, for solutions and/or upgrades. I don't think the CDR23 has the code. I've undone my battery many times without a problem (you will need to reprogram your auto up/down feature on your windows though).
Unlike others, I liked the factory stereo. Sounded good enough for me. So far, I've replaced the head unit, dash and door speakers, added an amp, and it still doesn't sound as good as the stock system. On mine, I think the amp went out. And with the '03's and the MOST fiber optic system, you basically have to rip everything out and start from scratch. Check your frunk next to the battery and see if you have the factory Becker or Bose amp. And if that amp has an orange cable. If it does, that's the fiber optic cable. Good luck.
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Glen
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