A8-1 & A7-7
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.
Start engine. With coolant temperature less than 194°F (90°C) and refrigerant pressure sensor reading less than 220 psi (1520 kPa), battery voltage should be present. With coolant temperature greater than 194°F (90°C) and refrigerant pressure sensor reading greater than 220 psi (1520 kPa), less than one volt should be present.