We all face future issues with non availability of electronics, and especially since the 90s. It would be nice if MMC retained technical access, and therefore, advice concerning the printed circuits used, but this is not the case.
In the absence of new components, we need to find knowledge, and used items. You would think that somebody within BMW, who was involved with Aero development would have a fix, and some dealers may have already found this, but as I discovered recently, unless you have an option of systematic replacement of components it's not a diy option.
I seem to recall that the Aero has an antenna for the immobiliser? is is that my false memory? The antenna was somewhere around the centre console? As above, though, a new battery and a check on all earth points is an essential.
