Hey all, it seems I have the infamous service trailer brakes message on my DIC, I got error codes C1112, C1114, and C1119. I checked all the trailer related fuses ...

Hey all, it seems I have the infamous service trailer brakes message on my DIC, I got error codes C1112, C1114, and C1119. I checked all the trailer related fuses (1/3//6/10/25) already replaced both the switch in the cab and the relay in the back with new geniune GM / AC Delco parts. I also cleaned the G401 ground which on my truck with the factory tow package that seems to be located above the spare tire mount and not near the back frame rail as all the diagrams show. I did a quick look at the wires and connections I could see and didn't see anything obviously wrong. At this point I'm at a loss, any ideas where else to look? I'm fairly certain the ground is good because I just cleaned it very thoroughly so perhaps I'm thinking I have a short to voltage somewhere?

You may want to unplug the trailer plug harness at the back rail and test the plug/cable for any shorts. Mine had corrosion inside the back of the plug.