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.
When there is a communication malfunction or communication stop from the air conditioning amplifier assembly to the heat pump ECU assembly, the air conditioning amplifier assembly illuminates the MIL and stores this DTC.