I took out the aftermarket head unit that was in my truck. Worked fine, installed with the aftermarket black adapter that connects the CD portions of the plug. The white plugs were not used. I'm reinstalling the factory business CD unit / radio. The CD player will eject and insert discs but the radio portion / telephone / audio doesn't display or turn on. Checked all the fuses they're fine. What else should I check? Seems like I have an extra plug as well. I have the big black plug to the CD and the antenna, then the white to the side of the radio/menu unit.
Edit: Sorry, 2006 E53 4.4.
