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Originally Posted by Quicksilver
Then why would the dealer say "They were unable to use the diagnostic fault finder and would not be able to use this tool in the future on the car due to the changes."
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The technician may have run into other issues, and just took the easy route out. I have seen this before, first hand, and the technician was totally wrong.
The radio's presence on the I-Bus should have no bearing at all on the general diagnostics functions on the car. It is on an entirely separate bus. And, that bus (the I-Bus) is a star, not a loop. I can think of one possibility, but it is a stretch. There may be an option for radio presets tied to the key, and if it can not find the radio, it may not code the key-specific options. That is why I posted my "Anyone with ideas" request. Maybe someone has first had experience with this, and not speculation.