mo soundz

I just bought a 900bt and installed it in my suburban. my first problem is that i cant get the bluetooth to work. It just keeps on saying that it didnt discover any phones. The next one is that i have two amps in my truck, one on my subs and one on my high end. My tweeters are on the speaker outputs on the radio. When the nav is giving my directions, it only speaks through my tweeters. Whats up with that? Any advice will be helpful.