[FredGraham]

I think you are probably correct with this diagram, although in Volvo speak I thought BCM was Brake Control Module? My car is a 2006 model. First of all it was the operation of the all 4 windows button. Then the SRS Airbag warning light, then a number of dashboard messages, Anti Skid service required, On call service required, Brake Failure Stop Safely & Reduced Engine Performance, to which the car entered limp mode. Although to be fair it's been fine since last Friday. Don't know if this was a glitch or something more sinister.