It is probably controlled by the model code, for a US acr it is 986310 for a base and 986320 for an S, I think in the UK for example it is 986311 and 986321 if I remember correctly. There are other coding elements in the computer where you can change the setup but when I experimented with making my car German some things started misbehaving, the doors would lock and unlock by themselves and the horn would sound.
So, in theory I'd think it possible but you'd have to experiment quite a bit as there are different settings sprinkled throughout the DME.
He the HVAC I think there is a button combination that will change the temperature from Fahrenheit to Celsius, not sure about the OBC display without playing around a lot.
Chris.
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