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Old 10-06-2011, 09:16 PM   #322
steve.325i
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Join Date: Aug 2008
Location: Brampton, Ontario, Canada
Posts: 763
My Ride: 2003 325i
Hi Niki,
Yes, the digital switching on the i-bus (or k-bus) wire is coupling to the audio signals.
Yes, shielding of at least the audio signals is absolutely required.

The first level of shielding is acheived simply by twisting the audio + and audio gnd together, known as twisted pair. This can also be done for the i-bus, it can be twisted in a group of three with the +12 and GND.

Real shielding is better.

So I need to ask ... why didn't you just snip the original usa-spec supplied cable & wire that into the HU connectors like we have been discussing? I never imagined that you were not using the original cable. lol
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