That's what I'm really wanting to find out. If I unplug all the connectors from the BCM except that one, it honks and lights come one. So the issue is isolated to that connector.It's the BCM thats causing it for sure. The BCM has your alarm system. 85 from your relay splits. One wire to the horn switch the other to the BCM. Now is the BCM bad, or are you in some weird state i know nothing about?