Sounds like something is bringing the i-bus down... Which could stop communication to the LCM inadvertently. In onions case is was the CD changer that had the bus down, but it could be anything on the bus so they should all be checked one at a time.

You can look at the i-bus chart/schematic in this link.
WDS BMW Wiring Diagram System - X5 E53

*side note* Mods, does the WDS link on this site not work properly anymore? I can't get the schematic pics to pop up...

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X5 pics

RIP 4.6is.....

2003 4.6is