tow bar electrics

hi, I have installed trailer in 19 can gateway intallation list. Then need to code for the rear sensors. Gone into 10 park/steer assist and set bit01 to trailer hitch installed. When I click to do it I get a message saying coding rejected, error 33 security access required. Am I doing it wrong...

when a towbar is retro fitted with the 13 pin socket with factory rear parking sensors and camera highline alarm. Regarding the charging of the onboard battery in the Caravan. Does the T6 have to have a fancy CTEK split charger or does the battery charging go through the caravans onboard...

help required please! IM GOING DEMENTED . Has anyone fitted a genuine VW 13 pin wiring kit to a T6 Kombi? In the wiring kit instructions it tells you to terminate some of the wires in the fusebox located under the passenger seat. i dont have a fusebox under the passenger seat! i have the cage...