Nope, I can't tell you definitively. It has multiple functions and not all related. When my kitchen is done I'm going to try and trace out the wiring but the tracks under components will not make it easy. It certainly has relays for the heater fan and I suspect the rear fog light and the heated front screen. There is a portion for aircon. It drives the warning lights. And extends the immobiliser light to the dash.
Many functions can be bypassed. All? Dunno.
