A9-8 & A9-9
WARNING: This page is about a different car, the 2001 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
With ignition on and mode knob on face (vent) mode, less than one volt should be present. With ignition on and mode knob on defrost mode, 4.5-5.5 volts should be present.