O2 Sensor plug Wiring ID
 

Does anyone know the wiring id for the o2 sensor plug.

There are three wires. two are for a heater the third goes to the DME. I would like to ID the wire that goes to the DME. Yes I know I can pull the DME and ohm it out but I was trying to avoid that.

I guess I could also use the volt meter and see what has continuity to ground with the ignition on as what has 12v. That would leave the third being the DME wire. Anyway if anyone has a ID on the pins on the O2 plug it would be appreciated.