If you have power and ground, you should have a 5V reference coming out of the ECBM. If it comes out of the ECBM, see if arrives at its destination. A signal is like an aircraft - it it takes off and doesn't arrive at its destination, start looking at the radar tracks. In this case, schematics are like the flight plan - where the signal is SUPPOSED to go.
If you have to ask questions like this, seriously, you need to find a friend who knows electrical troubleshooting and can read the schematics. It's wasting your time and ours to lead you through this one question at a time. We LOVE to be helpful, but you have to be in a position to use the help you're being offered.