DTC B3A0A-71: A/C Heating Electric Expansion Valve Actuator Stuck [08/2023 - ]: 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.
The heating electric expansion valve (No. 2 cooler expansion valve) is installed on the inlet pipe of the cooler condenser assembly and is half open when the ignition switch is turned off. When the ignition switch is turned to ON, heat pump air conditioning control is performed to operate the stepping motor and adjust the valve opening angle of the heating electric expansion valve (No. 2 cooler expansion valve). If the heating electric expansion valve (No. 2 cooler expansion valve) is stuck closed, the amount of refrigerant flowing to the battery is reduced and cooling performance decreases.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|---|---|
| B3A0A-71 | A/C Heating Electric Expansion Valve Actuator Stuck | Diagnosis condition:
Malfunction status:
Detection time: Condition 1
Condition 2
Trip:
|
|
Come on | Memorized | Air Conditioner | A | SAE Code:
|
HINT:
Battery cooling control can be performed from the Active Test of the hybrid battery system.
Refer to DATA LIST / ACTIVE TEST [08/2023 - ]