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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 P1B4B-72: Hybrid/EV Battery Heater Relay Actuator Stuck Open [03/2023 - ] >> Procedure

DTC P1B4B-72: Hybrid/EV Battery Heater Relay Actuator Stuck Open [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
      "P1B4B-72" 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 connectors.

      HINT: 

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

      OK

      The connectors are connected securely and there are no contact pressure problems.

      GTY1149097Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    NG 

    CONNECT SECURELY 

    Result: 

    OK 

    See step  3

  3. CHECK CONNECTOR CONNECTION CONDITION (NO. 1 TRACTION BATTERY HEATER RELAY) 
    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 No. 1 traction battery heater relay connector.

      HINT: 

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

      GTY1142256Courtesy 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  4

  4. CHECK NO. 1 TRACTION BATTERY HEATER (HV BATTERY HEATER TEMPERATURE SENSOR 0) 

    See step  3

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  21

    Result: 

    OK 

    See step  5

  5. CHECK NO. 1 TRACTION BATTERY HEATER (HV BATTERY HEATER TEMPERATURE SENSOR 1) 

    See step  4

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  20

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - NO. 1 TRACTION BATTERY HEATER RELAY) 
    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 No. 1 traction battery heater relay connector.
      NOTE:

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

      GTY1142256Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Disconnect the battery ECU assembly connector.
      NOTE:

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

      GTY1138761Courtesy 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
      x14-11 (BHR) - x4-12 (BHRB) Ignition switch off Below 1 Ω
      x14-8 (BHRG) - x4-13 (BHRG) Ignition switch off Below 1 Ω
      x14-11 (BHR) or x4-12 (BHRB) - Body ground and other terminals Ignition switch off 10 kΩ or higher
      x14-8 (BHRG) or x4-13 (BHRG) - 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
      x14-11 (BHR) or x4-12 (BHRB) - 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. Reconnect the No. 1 traction battery heater relay connector.
    13. Disconnect the SST.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (BH0, BH1 VOLTAGE) 
    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 No. 1 traction battery heater relay connector.
      NOTE:

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

      GTY1142256Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Turn the ignition switch to ON.

      Procedure1

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      x14-1 (BH0) - Body ground Ignition switch ON 11 to 14 V
      x14-6 (BH1) - Body ground Ignition switch ON 11 to 14 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

    7. Turn the ignition switch off.
    8. Disconnect the cable from the negative (-) auxiliary battery terminal.
    9. Reconnect the No. 1 traction battery heater relay connector.
    10. Disconnect the SST.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK RELAY (NO. 1 TRACTION BATTERY HEATER RELAY) 
    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. Disconnect the No. 1 traction battery heater relay connector.
      NOTE:

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

      GTY1142256Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      x14-1 (BH0) - x14-3 (HR0) Auxiliary battery voltage not applied between terminals x14-11 (BHR) and x14-8 (BHRG) 10 kΩ or higher
      x14-1 (BH0) - x14-3 (HR0) Auxiliary battery voltage applied between terminals x14-11 (BHR) and x14-8 (BHRG) Below 1 Ω
      x14-6 (BH1) - x14-4 (HR1) Auxiliary battery voltage not applied between terminals x14-11 (BHR) and x14-8 (BHRG) 10 kΩ or higher
      x14-6 (BH1) - x14-4 (HR1) Auxiliary battery voltage applied between terminals x14-11 (BHR) and x14-8 (BHRG) Below 1 Ω
      GTY1159211Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (No. 1 Traction Battery Heater Relay)

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. Reconnect the No. 1 traction battery heater relay connector.

    Result: 

    NG 

    REPLACE NO. 1 TRACTION BATTERY HEATER RELAY 

    Refer to REMOVAL [03/2023 - ]

    Result: 

    OK 

    See step  9

  9. CHECK FUSE (BATT HTR NO. 1) 

    Pre-procedure1

    1. Remove the BATT HTR NO. 1 fuse from the fuse block assembly.

      Procedure1

    2. Measure the resistance of the BATT HTR NO. 1 fuse.

      Standard Resistance

      Tester Connection Condition Specified Condition
      BATT HTR NO. 1 Ignition switch off Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. Install the BATT HTR NO. 1 fuse to the fuse block assembly.

    Result: 

    NG 

    REPLACE FUSE (BATT HTR NO. 1) 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (NO. 1 TRACTION BATTERY HEATER RELAY - BATT HTR NO. 1 FUSE) 
    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. Disconnect the No. 1 traction battery heater relay connector.
      NOTE:

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

      GTY1142256Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Remove the BATT HTR NO. 1 fuse from the fuse block assembly.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      x14-1 (BH0) - BATT HTR NO. 1 fuse holder 2 Ignition switch off Below 1 Ω
      x14-1 (BH0) or BATT HTR NO. 1 fuse holder 2 - Body ground and other terminals Ignition switch off 10 kΩ or higher
      NOTE:

      When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the terminal.

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    5. Install the BATT HTR NO. 1 fuse to the fuse block assembly.
    6. Reconnect the No. 1 traction battery heater relay connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (BATTERY TERMINAL - BATT HTR NO. 1 FUSE) 

    Pre-procedure1

    1. Remove the BATT HTR NO. 1 fuse from the fuse block assembly.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal.
    3. Disconnect the cable from the positive (+) auxiliary battery terminal.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      BATT HTR NO. 1 fuse holder 1 - Auxiliary battery positive (+) cable Ignition switch off Below 1 Ω
      BATT HTR NO. 1 fuse holder 1 or Auxiliary battery positive (+) cable - Body ground and other terminals Ignition switch off 10 kΩ or higher
      NOTE:

      When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the terminal.

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    5. Connect the cable to the positive (+) auxiliary battery terminal.
    6. Connect the cable to the negative (-) auxiliary battery terminal.
    7. Install the BATT HTR NO. 1 fuse to the fuse block assembly.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (NO. 1 TRACTION BATTERY HEATER RELAY - NO. 1 TRACTION BATTERY HEATER) 
    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 No. 1 traction battery heater relay connector.
      NOTE:

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

      GTY1142256Courtesy 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
      x15-1 (HR0) - x14-3 (HR0) Ignition switch off Below 1 Ω
      x15-1 (HR0) or x14-3 (HR0) - 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
      x15-1 (HR0) or x14-3 (HR0) - 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 No. 1 traction battery heater relay connector.
    13. Disconnect the SST.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (NO. 1 TRACTION BATTERY HEATER - BODY GROUND) 
    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. 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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      x15-7 (GND0) - Body ground Ignition switch off Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. Reconnect the No. 1 traction battery heater connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. CHECK FUSE (BATT HTR NO. 2) 

    Pre-procedure1

    1. Remove the BATT HTR NO. 2 fuse from the fuse block assembly.

      Procedure1

    2. Measure the resistance of the BATT HTR NO. 2 fuse.

      Standard Resistance

      Tester Connection Condition Specified Condition
      BATT HTR NO. 2 fuse Ignition switch off Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. Install the BATT HTR NO. 2 fuse to the fuse block assembly.

    Result: 

    NG 

    REPLACE FUSE (BATT HTR NO. 2) 

    Result: 

    OK 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (NO. 1 TRACTION BATTERY HEATER RELAY - BATT HTR NO. 2 FUSE) 
    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. Disconnect the No. 1 traction battery heater relay connector.
      NOTE:

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

      GTY1142256Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Remove the BATT HTR NO. 2 fuse from the fuse block assembly.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      x14-6 (BH1) - BATT HTR NO. 2 fuse holder 2 Ignition switch off Below 1 Ω
      x14-6 (BH1) or BATT HTR NO. 2 fuse holder 2 - Body ground and other terminals Ignition switch off 10 kΩ or higher
      NOTE:

      When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the terminal.

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    5. Install the BATT HTR NO. 2 fuse to the fuse block assembly.
    6. Reconnect the No. 1 traction battery heater relay connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (BATTERY TERMINAL - BATT HTR NO. 2 FUSE) 

    Pre-procedure1

    1. Remove the BATT HTR NO. 2 fuse from the fuse block assembly.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal.
    3. Disconnect the cable from the positive (+) auxiliary battery terminal.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      BATT HTR NO. 2 fuse holder 1 - Auxiliary battery positive (+) cable Ignition switch off Below 1 Ω
      BATT HTR NO. 2 fuse holder 1 or Auxiliary battery positive (+) cable - Body ground and other terminals Ignition switch off 10 kΩ or higher
      NOTE:

      When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the terminal.

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    5. Connect the cable to the positive (+) auxiliary battery terminal.
    6. Connect the cable to the negative (-) auxiliary battery terminal.
    7. Install the BATT HTR NO. 2 fuse to the fuse block assembly.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  17

  17. CHECK HARNESS AND CONNECTOR (NO. 1 TRACTION BATTERY HEATER RELAY - NO. 1 TRACTION BATTERY HEATER) 
    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 No. 1 traction battery heater relay connector.
      NOTE:

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

      GTY1142256Courtesy 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
      x15-8 (HR1) - x14-4 (HR1) Ignition switch off Below 1 Ω
      x15-8 (HR1) or x14-4 (HR1) - 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
      x15-8 (HR1) or x14-4 (HR1) - 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 No. 1 traction battery heater relay connector.
    13. Disconnect the SST.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  18

  18. CHECK HARNESS AND CONNECTOR (NO. 1 TRACTION BATTERY HEATER - BODY GROUND) 
    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. 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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      x15-12 (GND1) - Body ground Ignition switch off Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. Reconnect the No. 1 traction battery heater connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  19

  19. PERFORM ACTIVE TEST USING GTS (HYBRID/EV BATTERY HEATER RELAY) 

    Pre-procedure1

    1. None

      Procedure1

    2. Enter the following menus: Powertrain / HV Battery / Active Test / Hybrid Battery Heater Relay.

      Powertrain > HV Battery > Active Test 

      Active Test Display
      Hybrid/EV Battery Heater Relay
      Data List Display
      Hybrid/EV Battery Heater 1 Temperature
      Hybrid/EV Battery Heater 2 Temperature

      Result

      Result Proceed to
      After performing the Active Test for 5 minutes, the value of both "Hybrid/EV Battery Heater 1 Temperature" and "Hybrid/EV Battery Heater 2 Temperature" increase by 5°C (41°F) or more. A
      After performing the Active Test for 5 minutes, the value of "Hybrid/EV Battery Heater 1 Temperature" does not increase by 5°C (41°F) or more. B
      After performing the Active Test for 5 minutes, the value of "Hybrid/EV Battery Heater 2 Temperature" does not increase by 5°C (41°F) or more. C
      Other than above D

      Post-procedure1

    3. Turn the ignition switch off.

    Result: 

    A 

    REPLACE BATTERY ECU ASSEMBLY 

    Refer to REMOVAL [03/2023 - ]

    Result: 

    B 

    REPLACE NO. 1 TRACTION BATTERY HEATER 

    Refer to REMOVAL [03/2023 - ]

    Result: 

    C 

    REPLACE NO. 1 TRACTION BATTERY HEATER 

    Refer to REMOVAL [03/2023 - ]

    Result: 

    D 

    REPLACE NO. 1 TRACTION BATTERY HEATER 

    Refer to REMOVAL [03/2023 - ]

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

    See step  5

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE NO. 1 TRACTION BATTERY HEATER 

    Refer to REMOVAL [03/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

    See step  6

    Result

    Proceed to
    OK
    NG

    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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