[jakka351]

Explanation of how to set the FDIM display to be either Single Zone or Dual Zone.

There is a memory.location accessible via Diagnostic service 0x22 readDataByCommonId in the mark 1 and 2 Colour FDIMs located at 0xE205 that can be set to 0 for No AC, 2 for Single Zone or 3 for Dual Zone. Writing to the memory location can be done via service 0x2E and doesn't require security access.