Viral_Jim, hows the airbag?
It's taken me until tonight to get some diagnostics setup and the VX module installed on it.
After clearing various historical codes, the only one I have left is on the SRS system (no sh!t Sherlock) and it for Drivers airbag squib circuit (stage 1) high resistance.
Reading actual data for some of the circuits on the module I get the following resistance values (expressed in ohm)
Driver's airbag squib stage 1 3.45
Driver's airbag squib stage 2 2.77
Driver's side airbag squib 2.18
Driver's side curtain airbag squib 2.48
Driver's pretensioner squib 2.21
My thoughts (for what they're worth) looking at the values, I don't think it's going to be the under seat plug as this would put the resistance up on a number of circuits as I'm guessing the wiring is shared. Noting that the stage 2 squib resistance is also high, albeit not as high as stage 1, I'm thinking something in the steering column. Dirt in/on the clock spring maybe, meaning power isn't getting through to the wheel as well as it should. Stage 1 is an outer ring, stage 2 is more towards the centre (meaning it's got less crap on it)? I don't know how exactly that part of the car is made up.
That's my thought process, more thoughts would be welcome!