Originally Posted by
Zen Beer
Will that cause the ODBII to not connect to ECU? Not my understanding of how things work, but I am wrong all the time.
Probably shipping the RCM to be rebuilt anyways

Yes, If the Engine Control Relay is not closing, the ECU is not powered up.
You are wasting your time without the service manual. And using the search function here is an
asinine waste of time, as you have already discovered.
Go to Google: Input this "Chrysler Crossfire Service manual", scroll past all the vapid, worthless responses until you fine a link to this forum.
That's how I search this forum, works very well.
Then, bookmark this link, the fourth response under "crossfireforum" in the google results:
Crossfire Documentation Collection - CrossfireForum - The Chrysler Crossfire and SRT6 Resource