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Home >> Toyota >> 2025 >> Prius Plug-In Hybrid SE >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Battery System (PHEV) - Diagnostic Codes (4 Of 4) & Circuit Tests >> HYBRID BATTERY SYSTEM (for PHEV Model) >> DTC P1B4B-73: Hybrid/EV Battery Heater Relay Actuator Stuck Closed [03/2023 - ] >> Confirmation Driving Pattern

Confirmation Driving Pattern

HINT: 

  1. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  2. Turn the ignition switch off and wait for 30 minutes or more. [*1]
  3. Turn the ignition switch to ON (READY) and wait for 15 minutes or more. [*2]

    HINT: 

    [*1] to [*2]: Normal judgment procedure.

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

  4. Enter the following menus: Powertrain / HV Battery / Utility / All Readiness.
  5. Check the DTC judgment result.

    HINT: 

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.