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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 (3 Of 4) >> HYBRID BATTERY SYSTEM (for PHEV Model) >> DTC P1B4A-62: Hybrid/EV Battery Heater Temperature Sensor Signal Compare Failure [03/2023 - ] >> Procedure

DTC P1B4A-62: Hybrid/EV Battery Heater Temperature Sensor Signal Compare Failure [03/2023 - ]: Procedure

  1. CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL) 

    Pre-procedure1

    1. None

      Procedure1

    2. Check for DTCs.

      Powertrain > HV Battery > Trouble Codes 

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      "P1B4A-62" only is output, or DTCs except the ones in the table below are also output. A
      DTCs of hybrid battery system in the table below are output. B
      DTCs of hybrid control system in the table below are output. C
      System Relevant DTC
      Hybrid battery system P060A-47 Hybrid/EV Battery Energy Control Module Monitoring Processor Watchdog / Safety MCU Failure
      P060B-49 Hybrid/EV Battery Energy Control Module A/D Processing Internal Electronic Failure
      P0606-87 Hybrid/EV Battery Energy Control Module Processor to Monitoring Processor Missing Message
      Hybrid control system P0A1F-94 Hybrid/EV Battery Energy Control Module Unexpected Operation

      Post-procedure1

    3. Turn the ignition switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID BATTERY SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [03/2023 - ] 

    Result: 

    C 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [03/2023 - 01/2025] , or refer to DIAGNOSTIC TROUBLE CODE CHART [01/2025 - ]

    Result: 

    A 

    See step  2

  2. CHECK CONNECTOR CONNECTION CONDITION (BATTERY ECU ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair information because this may cause a malfunction.

      Procedure1

    2. Check the connections of the battery ECU assembly connector.

      HINT: 

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [12/2022 - ]

      GTY1157525Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      The connector is connected securely and there are no contact problems.

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    NG 

    CONNECT SECURELY 

    Result: 

    OK 

    See step  3

  3. CHECK NO. 1 TRACTION BATTERY HEATER (HV BATTERY HEATER TEMPERATURE SENSOR 0) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair information because this may cause a malfunction.

    2. Connect the SST.

      HINT: 

      Refer to Instructions for Connecting SST [03/2023 - ]

    3. Disconnect the battery ECU assembly connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY1157525Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Procedure1

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      x5-3 (TBH0) - x5-4 (GBH0) Ignition switch off
      0 to 10°C (32 to 50°F)      		 17.7 to 28.3 kΩ
      x5-3 (TBH0) - x5-4 (GBH0) Ignition switch off
      10 to 20°C (50 to 68°F)      		 11.9 to 18.4 kΩ
      x5-3 (TBH0) - x5-4 (GBH0) Ignition switch off
      20 to 30°C (68 to 86°F)      		 8.20 to 12.3 kΩ
      x5-3 (TBH0) - x5-4 (GBH0) Ignition switch off
      30 to 40°C (86 to 104°F)      		 5.72 to 8.40 kΩ
      x5-3 (TBH0) - x5-4 (GBH0) Ignition switch off
      40 to 50°C (104 to 122°F)      		 4.06 to 5.91 kΩ

      Procedure2

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      x5-3 (TBH0) - Body ground and other terminals Ignition switch off 10 kΩ or higher

      Pre-procedure2

    6. Connect the cable to the negative (-) auxiliary battery terminal.
    7. Turn the ignition switch to ON.

      Procedure3

    8. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      x5-3 (TBH0) - Body ground Ignition switch ON Below 1 V
      NOTE:
      • Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    9. Turn the ignition switch off.
    10. Disconnect the cable from the negative (-) auxiliary battery terminal.
    11. Reconnect the battery ECU assembly connector.
    12. Disconnect the SST.

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  4

  4. CHECK NO. 1 TRACTION BATTERY HEATER (HV BATTERY HEATER TEMPERATURE SENSOR 1) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair information because this may cause a malfunction.

    2. Connect the SST.

      HINT: 

      Refer to Instructions for Connecting SST [03/2023 - ]

    3. Disconnect the battery ECU assembly connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY1157525Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Procedure1

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      x5-5 (TBH1) - x5-6 (GBH1) Ignition switch off
      0 to 10°C (32 to 50°F)      		 17.7 to 28.3 kΩ
      x5-5 (TBH1) - x5-6 (GBH1) Ignition switch off
      10 to 20°C (50 to 68°F)      		 11.9 to 18.4 kΩ
      x5-5 (TBH1) - x5-6 (GBH1) Ignition switch off
      20 to 30°C (68 to 86°F)      		 8.20 to 12.3 kΩ
      x5-5 (TBH1) - x5-6 (GBH1) Ignition switch off
      30 to 40°C (86 to 104°F)      		 5.72 to 8.40 kΩ
      x5-5 (TBH1) - x5-6 (GBH1) Ignition switch off
      40 to 50°C (104 to 122°F)      		 4.06 to 5.91 kΩ

      Procedure2

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      x5-5 (TBH1) - Body ground and other terminals Ignition switch off 10 kΩ or higher

      Pre-procedure2

    6. Connect the cable to the negative (-) auxiliary battery terminal.
    7. Turn the ignition switch to ON.

      Procedure3

    8. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      x5-5 (TBH1) - Body ground Ignition switch ON Below 1 V
      NOTE:
      • Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    9. Turn the ignition switch off.
    10. Disconnect the cable from the negative (-) auxiliary battery terminal.
    11. Reconnect the battery ECU assembly connector.
    12. Disconnect the SST.

    Result: 

    OK 

    REPLACE BATTERY ECU ASSEMBLY 

    Refer to REMOVAL [03/2023 - ]

    Result: 

    NG 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - NO. 1 TRACTION BATTERY HEATER (HV BATTERY HEATER TEMPERATURE SENSOR 1)) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair information because this may cause a malfunction.

    2. Connect the SST.

      HINT: 

      Refer to Instructions for Connecting SST [03/2023 - ]

    3. Disconnect the battery ECU assembly connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY1157525Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Disconnect the No. 1 traction battery heater connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY1153389Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Procedure1

    5. Measure the resistance according to the value(s) in the tables below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      x15-5 (TBH1) - x5-5 (TBH1) Ignition switch off Below 1 Ω
      x15-11 (GBH1) - x5-6 (GBH1) Ignition switch off Below 1 Ω
      x15-5 (TBH1) or x5-5 (TBH1) - Body ground and other terminals Ignition switch off 10 kΩ or higher
      x15-11 (GBH1) or x5-6 (GBH1) - Body ground and other terminals Ignition switch off 10 kΩ or higher

      Pre-procedure2

    6. Connect the cable to the negative (-) auxiliary battery terminal.
    7. Turn the ignition switch to ON.

      Procedure2

    8. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      x15-5 (TBH1) or x5-5 (TBH1) - Body ground Ignition switch ON Below 1 V
      NOTE:
      • Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    9. Turn the ignition switch off.
    10. Disconnect the cable from the negative (-) auxiliary battery terminal.
    11. Reconnect the No. 1 traction battery heater connector.
    12. Reconnect the battery ECU assembly connector.
    13. Disconnect the SST.

    Result: 

    OK 

    REPLACE NO. 1 TRACTION BATTERY HEATER 

    Refer to REMOVAL [03/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - NO. 1 TRACTION BATTERY HEATER (HV BATTERY HEATER TEMPERATURE SENSOR 0)) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair information because this may cause a malfunction.

    2. Connect the SST.

      HINT: 

      Refer to Instructions for Connecting SST [03/2023 - ]

    3. Disconnect the battery ECU assembly connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY1157525Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Disconnect the No. 1 traction battery heater connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY1153389Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Procedure1

    5. Measure the resistance according to the value(s) in the tables below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      x15-3 (TBH0) - x5-3 (TBH0) Ignition switch off Below 1 Ω
      x15-10 (GBH0) - x5-4 (GBH0) Ignition switch off Below 1 Ω
      x15-3 (TBH0) or x5-3 (TBH0) - Body ground and other terminals Ignition switch off 10 kΩ or higher
      x15-10 (GBH0) or x5-4 (GBH0) - Body ground and other terminals Ignition switch off 10 kΩ or higher

      Pre-procedure2

    6. Connect the cable to the negative (-) auxiliary battery terminal.
    7. Turn the ignition switch to ON.

      Procedure2

    8. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      x15-3 (TBH0) or x5-3 (TBH0) - Body ground Ignition switch ON Below 1 V
      NOTE:
      • Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
      • If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    9. Turn the ignition switch off.
    10. Disconnect the cable from the negative (-) auxiliary battery terminal.
    11. Reconnect the No. 1 traction battery heater connector.
    12. Reconnect the battery ECU assembly connector.
    13. Disconnect the SST.

    Result: 

    OK 

    REPLACE NO. 1 TRACTION BATTERY HEATER 

    Refer to REMOVAL [03/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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