Fmugur, not sure I can help. My 4.8is does not have an auxiliary air pump. If the car does not have it, GT1 will not pick it up, and I will not be able to even see such an option.

I also have an electric fan on the 4.8is. And yes, when I was messing around with DIS, I did manage to turn it one and off. I didn't write the steps down, but will take a look next time I am "looking for functions".

On a side note, does anyone know anything about this BD - Brake force distribution error I keep seeing in the faults? I keep getting this, do all the tests for IKE, everything works, can't get to the bottom of this error.