Just an update with a photo of the rear buzzer which is on the top of the B-pillar (as mentioned in your post) of the T6 (09/2018) on the passenger side. I have replaced this buzzer (10€) following the default code : B107C14. I took more pictures if that may help.It's kinda complicated
TLDR: in your van front buzzer is used and it's located next to the PDC module under dash on the left side of the connection hub. It's accessed straight up from drivers footwell - the panel above pedals has to be removed.
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Complicated version:
- Since October 2018, there's no separate front / rear buzzers, front buzzer is used for both
- Vehicles with rear parking aid only don't have a rear buzzer, front buzzer is used instead
- Multivan / Caravelle / California: rear buzzer at lower part of left D-pillar
- Other vans: rear buzzer at upper part of left B-pillar
