Camera+ "P" - with park assist
Camera (only) - without park assist

I shared schemes earlier. look for a signal from the ignition else

👍 I will try this week, please wish me luck! Also if CAN bus is a ring, can pin 31 and 38 be used interchangeably between M-CAN_H and M-CAN_H_TRM so can the wires be swapped around? Yes. This one can system. But there are another's can systems in your car else. you can not mix them between ich athe...

M48 is lower connection in your old head unit

On pdf look pages obout navigation

Your m49 is:

))

2014 or 2017 there are no different.
You need look your sistem. In your case it - radio with navigation.
Wires and connectors are the same between units from 2013 till 2018.
Differents are begins from 08.2019 with new head unit (witout sd card)

If you look on foto with my adapter with attention, you will see, that both ones need any modifications.
For example Pin "auto acc"(7) from this connector of old head unit need to switch to (44) to big upper connector of new head unit.

It is easy. But, it necessary to understand principle of operation of CAN. At this case not important, how you do it. Becouse can system like a ring of wires. Signals will be correctly work inside ring.
Sorry, my level of english is poor((