Monitor Description
WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
When the power management control ECU detects a low power supply voltage for the battery smart unit while pre-charge is occurring, it determines that there is a malfunction in the battery smart unit circuit. When the power management control ECU detects a malfunction, it will illuminate the MIL and store a DTC.