If you are talking about the mode button then there is
coding for both Pre and Post facelift models.
Mode button always in Red
* Applicable up to MY16 *
1 - Module 09 - Electronic control unit - Code (31347)
2 - Long
Coding(Bytes Mode)
3 - Byte 15 - (Activate Bit 7)
In this mode it will always be illuminated in red.
*Apllicable from MY17*
1 - Select Control Unit 09
2 - Select Adaptation
3 - Select Button in center console
4 - Select Zusatzcodierung Farhrprofiktaster hat keine LED
5 - Change to Led not installed