2 Anntenna Connectors? yellow and blck

[StrictlyCustom]

I've used the search function, both on this forum and google. I have what looks to be 2 antenna connection harnesses that unplugged from the back of the radio. I purchased the antenna adapter and have the wiring harness listed in this thread: http://www.sonicownersforum.com/forum/t2181/ I'm assuming I just plug the antenna adapter into the black antenna connection, but what is the yellow one used for?

 

[ThatTmoGuy]

IIRC the yellow one is for bluetooth/Onstar/steering wheel controls

 

[StrictlyCustom]

Wonder why metra didn't include a connection for it. Wish the kit would've retained the upper mic/speaker. So just leave the yellow one disconnected?