There is a button on the main unit which you need to reset first then sync the remote on the mirror.
13 E93 M3 Melbourne Red DCT/Premium/EDC/NAV/220M wheel
12 E93 Space Gray ( Retired BMW buy back )
09 E82 Space Gray/Black int/Steps/Sport/Nav/Premium/Xenon/Phone Int/Hifi/269 wheel
2006 E90 ( sold )
My next vehicle would be a Zamboni