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Originally Posted by apw2607
The only thing left to try is the NAV MK IV. According to Martin at BMWNAV, he suggests that the Firmware inside the MK IV has to be 3.0 or higher for Sirius to function correctly. Perhaps thats the problem. After all, you've changed pretty much everything else !
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Nope, I have an 02/2002 production 325xiT which had the second week ever of MK IV production, and my Sirius tuner came up on the NAV screeen fine once I replaced the BM53 radio.