The cause of failure for terminal 15 (switched plus) relates to a defective relay holder in the main fuse box in this case.
Repair note:
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.
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