The engine control unit (ECU) is responsible for managing the direct signals received from the steering wheel with multifunction buttons and cruise control.
This is not the case for 6R (PQ25) ECU/engines.
There are some engines in PQ25 that can manage this type of MFSW with CC (including ACC).
For example, with the Transporter T6 (PQ25) and some of its engines (depending on emissions regulations), a couple of bytes must be set in the BCM (PQ25 - 7H0/7E0/...). Some for the communication type and other/s for ACC (if applicable). Note that some T6 engines, depending on emissions regulations, manage cruise control like the 6R (via stalk-BCM-ECU).
Another example is that, due to the evolution of ECUs and firmware compatibility, in the later years of production of the Russian Polo Sedan (PQ25), MFSW with CC can be installed, just as I explained previously for the T6, without needing CCE. But never from the factory, only retrofitting.
Having said this:
To install MFSW with CC from later generations in the 6R, it is 'mandatory' to have the standard cruise control wiring installed and active (based on PQ25), and to have the 'emulator' installed that manages the signals that were supposedly sent from the stalk but are now actually sent from the new multifunction steering wheel with cruise control (e.g., Golf 7, Golf 8, ...).
Slavik's CCE handles this perfectly on most 6R PQ25 engines (including CDL engine).
Depending on the platform the buttons belong to, it is necessary that the new multifunction buttons with CC are correctly coded
'before installing' according to the functions required for your 6R (DSG, CC, ...).
They can be coded either on a test bench or installed in a vehicle of the same platform as the new buttons.
In some cases, if the new buttons are recognized by VCDS/VCP, they can be coded into the 6R
before installing the CCE.
Once the CCE is operational, the diagnosis of the new buttons disappears from the diagnostic without creating any type of conflict or failure.
Note: There are possible variants for the coding and management carried out by the CCE.
I've tried to explain it as clearly as possible without getting into technical details.
It's actually easier than it seems... definitely contact Slavik.
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. I have the 7E0 BCM Max, this BCM has a bit for controlling the newer steering wheels right? Can this BCM also control Golf MK8 steering wheels without a emulator? Or do you need a Emulator for the CC to work?