I'm finishing up a conversion using a 2009 Impala 3.5 L and a standalone E38 ECM but cannot establish communication with my V1. The E38 is the only controller on the Bus and I have installed a 120 Ohm terminating resistor across the LAN lines.

Ive been searching all day without once considering that my V1 does not support the Gen IV stuff untill stumbling across a thread on an E67 not communicating with the V1. Does this apply to my E38 as well?