E70 3.0si N52 oxygen sensor fuse or relay location?
 

I am trying to find either a fuse or relay for the o2 post cat heaters. There is only one 40 amp fuse under the ebox underneath the cabin filters but not sure what it is for. I have pulled down passenger glove fuse box and also checked right back fuse box by rear gate. I have spent two days searching for information before posting but no images or links address the E70, 2008 X5 3.0si fuses or their description or deciphering of fuse icons. Thanks for any help offered.

Screenshot attached.

E70 3.0si N52 02 sensor fuse/relay location
 

Thank you for posting the images. I cannot read the schematic due to its small font. Could you possibly enlarge that portion or is it not possible? I think this will be of great help if I can determine which fuses are for the post cat heaters.