Transit Custom 2016 - Rear Speakers - Special case?

[Ubba]

Hi all,
i have 2016 Transit Custom (double Cab) for which I would like to activate the rear speakers. I believe i found the connectors in the side panales (white connectors with 4 poles). I bought the ODB connector that Forscan advice and I have the Forescan software with Extended License.

Technically it should be easy, I should change the 727-01-01 0232 in ACM to 727-01-01 0202 because the 3rd digit specify the use or not of the rear speakers acording to this website (https://cyanlabs.net/asbuilt-db/acm/). However, it doesn't work, basically when i try to chnage the number it tells me "Successfull" but in reality it skip it and keeps the default value.

In oder posts i found similiar situation but they all have 727-01-01 xxxx xxxx xxxx codes (3 sets of 4 digits), i have only one set of 4 digits.

Is there somebody who can help me?
thanks

PS i have Sync 1.1

[Tombollew]

Been a while I know but I'm keen on fitting some rears in my double cab did you get it working in the end? Where were the wires?