sounds like a bad radio module; I remember when I retrofitted a newer style radio module in my X5 that I mixed up two of the wires; it ended up that nothing worked, no sound out of nav, CD, tape or anything. So, if it's not a poor connection between the wiring harness and the radio module, it means the radio module might be defective. Anybody else have any advice? (BTW, if you have a later build 03, you're most probably still covered under new car warranty, unless you're over 50k miles already)

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