Ok when you get back up in the morning the reason you have no sound is that pin 13 on the connector doesn't have power.

Locate pin 13 in the large connector in that's in the dash that your hooking to and find out what is on the seicane's connector that matches pin 13 on the car's connector.

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
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Aftermarket E53 Radio Install