Andy According to the German Galaxy/Sharan forum (and I can read a bit of German) the aux heater fuse is no 12 (at least on the facelifted models of the vehicle, from model year 2001 I understand)). No guarantee, but anyway should be quick to check if that fuse is ok. Hope this is of any help (while I am struggling to identify the right replacement glow plug for my Sharan 2002 heater) Jan