regarding test don't guess- the way to verify relay function on the RCM is through loaded circuit voltage drop testing. I've already checked all the relay coils and they are good. they also physically latch. like some have said pitted contacts can cause problems, and I will verify that with a 5amp load(headlight bulb) across the high current path of each relay.
all I have to do now is figure out the traces on the RCM to get to that high current path. for some reason it's eluding me.
You'll get it figured out.
With regards to the SKREEM, I'm still not clear on all of the failure pathways. The transponder chip could fail due to dropping fob or whatever, the SKREEM antenna around the key switch could somehow fail or break, the SKREEM transmitter could fail, or the programming that passes codes to the ECU could fail. I'm glad a few folks here have figured it out and are offering their services.
I ordered one of these little rings that detects the RF pulse from the SKREEM antenna to the transponder chip. One of the reviewers says it worked on his Mercedes and Crossfire SKREEMs. It just gives an LED blink, but at least it's a diagnostic for one part of the system and it only costs 6 bucks. I'll let you know in a few days if it works on my Crossfire.
SKREEM test coil