BCM Basics 101 (03-06) Body Control Module (BCM) - C2Bcm Wiring Diagram 2010 Z71 - Apr 06, 2012 · OK, since the last time anyone seems to have had this problem was about six months ago, I thought it might be time to start a new thread. I definitely have this SECURITY / Passlock II issue as well on my 98 Yukon.. Please use the form below to contact us. We reply to every ticket that is started in the order we received them. Making multiple tickets will only delay our staff, please only respond to one ticket..