A9-4 & A9-3
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 ambient temperature at 77°F (25°C), 1.8-2.2 volts should be present. With ignition on and ambient temperature at 104°F (40°C), 1.2-1.6 volts should be present.