Jeff, the '02 0411, 5.3L and IPC into my 99 Denali L31 is well underway but I have questions:
On your instructions you say to omit/not use C1-59 YEL 710 Serial Data to BCM. If I go this route, will something not work correctly? Can I connect this circuit to Class 2 Serial Data on the DLC, BCM or...