Hi,
I got this bsw service required light and I know why... Imported my phev from Canada and I just swapped my driver side mirror for a curved one (required for homologation) and I had to leave a wire unattached as there is no spot for it on the new mirror. It is the bsw wire. If by any chance anyone would know how to desactivate this warning message I won't have to order another mirror with bsw function in it.