Converted a 2006 CTS-V LS2 Harness for stand alone operation. Donor car ran and drove before pulling the harness. Hooked the completed harness up to a battery on the bench to tune out VATS and I'm not getting any communication with my V2.

Verified power at the ECM pins and also at the OBD2 plug. Checked continuity for the CAN+ and CAN- wires. Grounds are also good. Followed this tutorial as well:

http://download.efilive.com/Tutorial...20Tutorial.pdf

Should there be voltage at the CAN+/CAN- pins all the time at the OBD2? If so what's a good reading?

Not sure what I'm missing to get this thing going. Is there any chance there could be interference from outside power on the CAN signal, do the wires need to be completely twisted the entire length? Any other troubleshooting tips.

Thanks

Jake