OEM CD Changer Install

OK, unit is not installed in the trunk space as provided in 2003 325i sedan. Looks neat and factory. Unit is Alpine made BMW changer made April, 2004.
Wired to six and three pin jacks, only seem to go in one way.
Unit does not appear to be powered. The cd carrier does not eject.
Do I have to removed battery cables to cut power and let reinitialize?
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