Detecting Condition
WARNING: This page is about a different car, the 2003 Toyota Prius, 2002 Toyota Prius, and 2001 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
If any trouble occurs in the HV control system, the ECU prohibits RBS control. If the voltage of terminal IG2 in the brake ECU is 10.5 volts or more, and continues for 1.5 seconds may set DTC 59. If regenerative malfunction occurs on the HV ECU side or if received data is accepted as valid, may also set DTC 59.