Monitor Description
WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.
The MG ECU monitors the motor inverter over-voltage (OVH) signal line. If the MG ECU detects an open or short malfunction of the OVH signal circuit, the HV control ECU illuminates the MIL and sets a DTC.