OK, that makes sense - I guess if you have factory phone then the sound from the amp is muted and the sound from the phone comes thru the speakers. In other words, I don't need those two wires. I was looking at the WDS diagram for the radio/ amp but those wires were not included - now I know why.

Thanks for the info!!

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2001 X5 3.0i (PP/WP/AP) Traded at 213K miles
RARE White on Black - Why does everyone get Tan??
First E53 with 215s on XOutpost!!