Dursell

I have a 2002 Olds Bravada with AVIC F700BT and just put a new battery in my truck. And now my HU doesn't shut off when I open the Door. I called Best Buy who installed it and they said pull the main fuse(41) under left passenger side seat. All that does is cut power to it but when put back in powers up and stays on. Then they told me to disconnect my HU, and plug back in, which I did...and Still doesn't work... PLEASE HELP!!!