Reversed wiring harnesses
It appears that on some of the 535 F10s the wiring harnesses are reversed. PeterC4 asked me to check my wiring harness against his as sure enough the harness that the JB4 needs to tap into is on the left when facing the car head-on whereas mine is on the right (as depicted in the JB4 instructions).
Sorry about the crappy picture but if you compare the left harness in the attached picture with the right harness in the previous post you will see they are same.
2011 535i xDrive, Dark Graphite Metallic, Veneto Beige Dakota Leather, Technology Package, M Sport Package, Executive Package delivered Christmas Eve '10, Mods - quad tips, 20% tint, JB4.