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Old 01-31-2009, 09:23 AM
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Brian-bmw Brian-bmw is offline
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You have a component on the MOST bus crashing the iDrive. This is very hard to diagnose and isolate. My Dad had similar symptoms on his 2005 E66. IT spent many days at the dealer trying all kinds of things. Eventually, they isolated that it was the telephone control unit. They replaced the TCU, and it has been fine ever since. What made the problem hard to solve, is that his phone worked perfectly fine otherwise.

In your case, it will probably take some patience with the dealer. They will have to do this thing where they hook the car up to their network and a senior engineer in BMW remotely looks at it. They process is pretty cool, but it is not easy for typical dealer technicians to figure out.
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