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Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 83 (Heating / Air Conditioning System - Diagnostic Codes (1 Of 3)) >> AIR CONDITIONING SYSTEM (for PHEV Model) >> DTC B1385-71: A/C Cooling Electric Expansion Valve Actuator Stuck [08/2023 - ] >> Confirmation Driving Pattern

Confirmation Driving Pattern

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.

HINT: 

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the GTS on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the ignition switch off and wait for at least 30 seconds.
  6. Turn the ignition switch to ON (READY) [A].
  7. Turn the GTS on.
  8. Check that the following conditions are met and perform the Active Test according to the display on the GTS. [B]

    Enter the following menus: Powertrain / HV Battery / Active test / Hybrid/EV Battery Refrigerant Cooling Control.

    CONDITION

    Ambient temperature 5 °C or higher
    Operation time 10 minutes

    HINT: 

    • In order to perform "Hybrid/EV Battery Refrigerant Cooling Control", the HV battery minimum temperature must be 20°C (68°F) and the refrigerant temperature must be 20°C (68°F) or higher.

      If the above conditions are not established, perform the "Hybrid/EV Battery Heater Relay" Active Test in an environment with an ambient temperature of 5°C (41°F) or higher and increase the HV battery temperature.

      The temperature will drop after the heater is stopped, so increase the values of "Hybrid/EV Battery Temperature 1 to 20, Hybrid/EV Battery Refrigerant Temperature (Duct Outlet 1), Hybrid/EV Battery Refrigerant Temperature (Duct Outlet 2)" in the Data List to 21°C (70°F) or higher.

      (At an ambient temperature of 5°C (41°F), "Hybrid/EV Battery Heater Relay" will need to be performed for approximately 10 hours.)

    • Perform this step with the A/C blower switch off.
  9. Wait 5 minutes or more. [C]
  10. Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes [D].
  11. Read the pending DTCs.

    HINT: 

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  12. Enter the following menus: Body Electrical / Air Conditioner / Utility / All Readiness.
  13. Input the DTC: B1385-71.
  14. Check the DTC judgment result.
    GTS Display Description
    NORMAL
    • DTC judgment completed
    • System normal
    ABNORMAL
    • DTC judgment completed
    • System abnormal
    INCOMPLETE
    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    HINT: 

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system is malfunctioning.
    • If the judgment result is INCOMPLETE, perform steps [B] through [D] again.
    • [A] to [D]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.