Malc,

Thanks for your thoughtful response. I personally haven't checked the volts on the battery, but will certainly do that as a first check! I imagine both the indy shop and dealership would have done so, but you know what they say about assumptions....

Reading through a few threads I also think the root issue, likely DSC, is causing the SLS inactive light to come on as well, so will take it one step at a time. Your diagram of all the components that tie into the DSC is a bit, well, intimidating! But when broken down into each individual component seems very straight forward.

I am in the USA and have seen a few threads who have used shops to repair and return their modules. MyAirBags.com has a repair and return service for $169 and offers 24 hour turn-around. However, I can't find a DIY removal and reinstall writeup for the life of me! If i could, i think i would give this a shot as it's cheaper than the alternatives of losing a few thousand on selling it or giving the dealership a few thousand to throw parts at it.

Open to any and all suggestions on what else to investigate based on the fault codes from the vehicle.

Thanks all!!
AJ