Silverado 2003 + PCM DBW Ground ?

Can someone tell me if the grounds on the Blue Connector Pin's#24, 27, 64 & 67 are needed for the PCM internally or are they there for the O2 sensor's? I'm using the normal ground's on Pin's 1 & 40 on Blue connector & Pin's 1 & 40 on green connector. I'm going to be running OL-MAF or OL-SD so O2's will not be needed(OFF ROAD USE ONLY...:D) It just seems like to many grounds...IDK maybe I'm wrong and the PCM needs them.

Anyone? Maybe Ross knows...:secret:

From looking at the wiring schematics, it leads me to guess that that's what those grounds are for (O2 heater control), but that's definitely an assumption on my part.

If it were me, I would have those connected. $0.02. :)

I would say it is too easy to make them grounds and don't worry about them anymore.
Al