Chop Shop Sipponen, Other Workshop Activities Removing BWM aftermarket immobilizer 14.07.2014 Sami Sipponen This box and couple of wires come out when I started to investigate how the aftermarket immobilizer had been installed to my friend’s BMW: Tomorrow it will be replaced with an aftermarket car alarm system with remote controls. Share this:FacebookTwitterPrintWhatsAppMoreLinkedInTumblrPocketPinterestReddit