The cause of failure for terminal 15 (switched plus) relates to a defective relay holder in the main fuse box in this case.
Check the main fuse box's date of manufacture.
Only affects the main fuse box (under the driver's seat) with the following date of manufacture: 11.25.2011.
OE no. 7P0 937 548F (not for hybrid)
OE no. 7P0 937 548G (for hybrid)
If the main fuse box has already been replaced in the course of a manufacturer campaign, this is indicated by a sticker in the area of the spare wheel well and documented in the service handbook.
Important safety note