Monitor Description

WARNING: This page is about a different car, the 2025 Lexus RX 450h+ and 2024 Lexus RX 450h+. However, it is still accessible from the selected car via links, so may be relevant.

This DTC is detected when the cooling electric expansion valve (cooler expansion valve) is stuck open.

During a cooling battery cooling operation, if the opening angle of the cooling electric expansion valve (cooler expansion valve) is smaller than the threshold, the combined opening angle of the No. 1 magnet valve assembly and No. 3 magnet valve assembly is the threshold or higher, or the temperature of the external condenser refrigerant temperature sensor (thermostat assembly) is the threshold or lower and the average temperature of the No. 2 air conditioning thermistor assembly (duct outlet 1, duct outlet 2) is the threshold or higher; or, during a battery cooling operation, if the opening angles of the No. 1 magnet valve assembly and No. 3 magnet valve assembly are both the threshold or higher, or the temperature of the external condenser refrigerant temperature sensor (thermostat assembly) is the threshold or lower and the average temperature of the No. 2 air conditioning thermistor assembly (duct outlet 1, duct outlet 2) is the threshold or higher, the air conditioning amplifier assembly illuminates the MIL and stores this DTC.