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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 138 (Hybrid Battery System (For Lithium-Ion Battery) - Diagnostic Codes (2 Of 3)) >> HYBRID BATTERY SYSTEM (for LITHIUM-ION BATTERY) >> DTC P1AC4-13: Hybrid/EV Battery Stack 1 Current Interrupt Device Circuit Open; DTC P1AC5-13: Hybrid/EV Battery Stack 2 Current Interrupt Device Circuit Open [08/2020 - ] >> Procedure

DTC P1AC4-13: Hybrid/EV Battery Stack 1 Current Interrupt Device Circuit Open; DTC P1AC5-13: Hybrid/EV Battery Stack 2 Current Interrupt Device Circuit Open [08/2020 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, and 2021 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / HV Battery and Hybrid Control / Trouble Codes.
    4. Check for DTCs.

      Powertrain > HV Battery > Trouble Codes 

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      "P1AC4-13 or P1AC5-13" 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
    5. Turn the power switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID BATTERY SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2020 - ] 

    Result: 

    C 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2020 - 08/2021]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2021 - ] 

    Result: 

    A 

    See step  2

  2. CHECK DTC 
    1. Check the DTCs that were output when the vehicle was brought to the workshop.

      Result

      Result Proceed to
      "P1AC4-13" is also output. A
      "P1AC5-13" is also output. B

    Result: 

    B 

    See step  8

    Result: 

    A 

    See step  3

  3. READ VALUE USING TECHSTREAM (HYBRID/EV BATTERY CELL 1 TO 35 VOLTAGE) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
      NOTE:

      Do not turn the power switch on (READY).

    3. Enter the following menus: Powertrain / HV Battery / Data List / Hybrid/EV Battery Cell 1 to 35 Voltage.
    4. Read the value of data list items "Hybrid/EV Battery Cell 1 Voltage" through "Hybrid/EV Battery Cell 35 Voltage" and make a note if the value of any is 1.6 V or less.

      Powertrain > HV Battery > Data List 

      Tester Display
      Hybrid/EV Battery Cell 1 Voltage
      Hybrid/EV Battery Cell 2 Voltage
      Hybrid/EV Battery Cell 3 Voltage
      Hybrid/EV Battery Cell 4 Voltage
      Hybrid/EV Battery Cell 5 Voltage
      Hybrid/EV Battery Cell 6 Voltage
      Hybrid/EV Battery Cell 7 Voltage
      Hybrid/EV Battery Cell 8 Voltage
      Hybrid/EV Battery Cell 9 Voltage
      Hybrid/EV Battery Cell 10 Voltage
      Hybrid/EV Battery Cell 11 Voltage
      Hybrid/EV Battery Cell 12 Voltage
      Hybrid/EV Battery Cell 13 Voltage
      Hybrid/EV Battery Cell 14 Voltage
      Hybrid/EV Battery Cell 15 Voltage
      Hybrid/EV Battery Cell 16 Voltage
      Hybrid/EV Battery Cell 17 Voltage
      Hybrid/EV Battery Cell 18 Voltage
      Hybrid/EV Battery Cell 19 Voltage
      Hybrid/EV Battery Cell 20 Voltage
      Hybrid/EV Battery Cell 21 Voltage
      Hybrid/EV Battery Cell 22 Voltage
      Hybrid/EV Battery Cell 23 Voltage
      Hybrid/EV Battery Cell 24 Voltage
      Hybrid/EV Battery Cell 25 Voltage
      Hybrid/EV Battery Cell 26 Voltage
      Hybrid/EV Battery Cell 27 Voltage
      Hybrid/EV Battery Cell 28 Voltage
      Hybrid/EV Battery Cell 29 Voltage
      Hybrid/EV Battery Cell 30 Voltage
      Hybrid/EV Battery Cell 31 Voltage
      Hybrid/EV Battery Cell 32 Voltage
      Hybrid/EV Battery Cell 33 Voltage
      Hybrid/EV Battery Cell 34 Voltage
      Hybrid/EV Battery Cell 35 Voltage
    5. Turn the power switch off.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

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

    Be sure to wear insulated gloves and protective goggles.

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

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the No. 1 HV battery hose.

      Refer to PROCEDURE - Step 21 [08/2020 - 08/2021] , or refer to PROCEDURE - Step 21 [08/2021 - 09/2022] , or refer to PROCEDURE - Step 21 [09/2022 - ]

    3. Check the connector connections and contact pressure of the relevant terminals for the battery ECU assembly.

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [06/2018 - ]

      OK

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

      Result

      Result Proceed to
      OK A
      Not connected securely The terminals are not damaged or corroded B
      Not connected securely The terminals are damaged or corroded C
      GTY946901Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Install the No. 1 HV battery hose.

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPLACE NO. 1 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    A 

    See step  5

  5. CHECK NO. 1 HV SUPPLY STACK SUB-ASSEMBLY (HV BATTERY CELL VOLTAGE) 
    WARNING:
    • Be sure to wear insulated gloves and protective goggles.
    • Disconnect only the connector corresponding to the HV battery cell to be checked. Do not disconnect the other connectors.
    NOTE:

    Make sure to use tester probes with a diameter of approximately 0.5 mm (0.0197 in.) when measuring the voltage of each HV battery cell.

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

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the No. 1 HV battery hose.

      Refer to PROCEDURE - Step 21 [08/2020 - 08/2021] , or refer to PROCEDURE - Step 21 [08/2021 - 09/2022] , or refer to PROCEDURE - Step 21 [09/2022 - ]

    3. Disconnect the y15 battery ECU assembly connector.
      GTY946901Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the voltage according to the value(s) in the table below.

      HINT: 

      Measure the voltage of the HV battery cells whose value in the data list was 1.6 V or less only.

      GTY946955Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery ECU Assembly)      		 - -
      HV Battery Cell Tester Connection Condition
      1 y15-1 (GA0) - y15-13 (VA1) Always
      2 y15-13 (VA1) - y15-25 (VA2) Always
      3 y15-25 (VA2) - y15-2 (VA3) Always
      4 y15-2 (VA3) - y15-14 (VA4) Always
      5 y15-14 (VA4) - y15-26 (VA5) Always
      6 y15-26 (VA5) - y15-3 (VA6) Always
      7 y15-3 (VA6) - y15-15 (VA7) Always
      8 y15-15 (VA7) - y15-27 (VA8) Always
      9 y15-27 (VA8) - y15-4 (VA9) Always
      10 y15-4 (VA9) - y15-16 (VA10) Always
      11 y15-16 (VA10) - y15-28 (VA11) Always
      12 y15-28 (VA11) - y15-5 (VA12) Always
      13 y15-5 (VA12) - y15-17 (VA13) Always
      14 y15-17 (VA13) - y15-29 (VA14) Always
      15 y15-29 (VA14) - y15-6 (VA15) Always
      16 y15-6 (VA15) - y15-18 (VA16) Always
      17 y15-18 (VA16) - y15-30(VA17) Always
      18 y15-30(VA17) - y15-7 (VA18) Always
      19 y15-7 (VA18) - y15-19 (VA19) Always
      20 y15-19 (VA19) - y15-31 (VA20) Always
      21 y15-31 (VA20) - y15-8 (VA21) Always
      22 y15-8 (VA21) - y15-20(VA22) Always
      23 y15-20(VA22) - y15-32 (VA23) Always
      24 y15-32 (VA23) - y15-9 (VA24) Always
      25 y15-9 (VA24) - y15-21 (VA25) Always
      26 y15-21 (VA25) - y15-33 (VA26) Always
      27 y15-33 (VA26) - y15-10(VA27) Always
      28 y15-10(VA27) - y15-22 (VA28) Always
      29 y15-22 (VA28) - y15-34 (VA29) Always
      30 y15-34 (VA29) - y15-11 (VA30) Always
      31 y15-11 (VA30) - y15-23 (VA31) Always
      32 y15-23 (VA31) - y15-35 (VA32) Always
      33 y15-35 (VA32) - y15-12 (VA33) Always
      34 y15-12 (VA33) - y15-24 (VA34) Always
      35 y15-24 (VA34) - y15-36 (VA35) Always
      WARNING:

      Make sure not to cross the electrodes of an electrical tester measurement terminals.

      NOTE:

      Make sure to check the polarity of each terminal (positive (+) or negative (-)) before connecting a tester.

      Result

      Result Proceed to
      The voltage between the terminals is 1.6 V or less. A
      Other than above B
    5. Reconnect the y15 battery ECU assembly connector.
    6. Install the No. 1 HV battery hose.

    Result: 

    B 

    REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    A 

    See step  6

  6. CHECK BATTERY ECU ASSEMBLY (GA0 - VA35) 
    NOTE:

    Make sure to use tester probes with a diameter of approximately 0.5 mm (0.0197 in.) when measuring the voltage.

    1. Remove the battery ECU assembly.

      Refer to REMOVAL [08/2020 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

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

      HINT: 

      Only inspect the terminals of the battery ECU assembly which correspond to the HV battery cells which measured 1.6 V or less in the previous step.

      GTY946945Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Battery ECU Assembly)      		 - -

      Standard Voltage

      HV Battery Cell Tester Connection
      (Tester Probe Polarity)      		 Condition Specified Condition
      1 y15-1 (GA0) (+) - y15-13 (VA1) (-) Always 0.3 to 1.0 V
      2 y15-13 (VA1) (+) - y15-25 (VA2) (-) Always 0.3 to 1.0 V
      3 y15-25 (VA2) (+) - y15-2 (VA3) (-) Always 0.3 to 1.0 V
      4 y15-2 (VA3) (+) - y15-14 (VA4) (-) Always 0.3 to 1.0 V
      5 y15-14 (VA4) (+) - y15-26 (VA5) (-) Always 0.3 to 1.0 V
      6 y15-26 (VA5) (+) - y15-3 (VA6) (-) Always 0.3 to 1.0 V
      7 y15-3 (VA6) (+) - y15-15 (VA7) (-) Always 0.3 to 1.0 V
      8 y15-15 (VA7) (+) - y15-27 (VA8) (-) Always 0.3 to 1.0 V
      9 y15-27 (VA8) (+) - y15-4 (VA9) (-) Always 0.3 to 1.0 V
      10 y15-4 (VA9) (+) - y15-16 (VA10) (-) Always 0.3 to 1.0 V
      11 y15-16 (VA10) (+) - y15-28 (VA11) (-) Always 0.3 to 1.0 V
      12 y15-28 (VA11) (+) - y15-5 (VA12) (-) Always 0.3 to 1.0 V
      13 y15-5 (VA12) (+) - y15-17 (VA13) (-) Always 0.3 to 1.0 V
      14 y15-17 (VA13) (+) - y15-29 (VA14) (-) Always 0.3 to 1.0 V
      15 y15-29 (VA14) (+) - y15-6 (VA15) (-) Always 0.3 to 1.0 V
      16 y15-6 (VA15) (+) - y15-18 (VA16) (-) Always 0.3 to 1.0 V
      17 y15-18 (VA16) (+) - y15-30 (VA17) (-) Always 0.3 to 1.0 V
      18 y15-30 (VA17) (+) - y15-7 (VA18) (-) Always 0.3 to 1.0 V
      19 y15-7 (VA18) (+) - y15-19 (VA19) (-) Always 0.3 to 1.0 V
      20 y15-19 (VA19) (+) - y15-31 (VA20) (-) Always 0.3 to 1.0 V
      21 y15-31 (VA20) (+) - y15-8 (VA21) (-) Always 0.3 to 1.0 V
      22 y15-8 (VA21) (+) - y15-20 (VA22) (-) Always 0.3 to 1.0 V
      23 y15-20 (VA22) (+) - y15-32 (VA23) (-) Always 0.3 to 1.0 V
      24 y15-32 (VA23) (+) - y15-9 (VA24) (-) Always 0.3 to 1.0 V
      25 y15-9 (VA24) (+) - y15-21 (VA25) (-) Always 0.3 to 1.0 V
      26 y15-21 (VA25) (+) - y15-33 (VA26) (-) Always 0.3 to 1.0 V
      27 y15-33 (VA26) (+) - y15-10 (VA27) (-) Always 0.3 to 1.0 V
      28 y15-10 (VA27) (+) - y15-22 (VA28) (-) Always 0.3 to 1.0 V
      29 y15-22 (VA28) (+) - y15-34 (VA29) (-) Always 0.3 to 1.0 V
      30 y15-34 (VA29) (+) - y15-11 (VA30) (-) Always 0.3 to 1.0 V
      31 y15-11 (VA30) (+) - y15-23 (VA31) (-) Always 0.3 to 1.0 V
      32 y15-23 (VA31) (+) - y15-35 (VA32) (-) Always 0.3 to 1.0 V
      33 y15-35 (VA32) (+) - y15-12 (VA33) (-) Always 0.3 to 1.0 V
      34 y15-12 (VA33) (+) - y15-24 (VA34) (-) Always 0.3 to 1.0 V
      35 y15-24 (VA34) (+) - y15-36 (VA35) (-) Always 0.3 to 1.0 V
      NOTE:
      • Make sure to check the polarity of each terminal (positive (+) or negative (-)) before connecting a tester.
      • Be sure to set the toyota electrical tester to diode range when performing this test.
      • Read the voltage after the value has stabilized.
      • In order to avoid damaging the terminals of the battery ECU assembly, make sure to use tester probes with a diameter of approximately 0.5 mm (0.0197 in.) when measuring the voltage of the battery ECU assembly.

      Result

      Result Proceed to
      The voltage between the terminals is 0.3 to 1.0 V. A
      Other than above B
    3. Install the battery ECU assembly.

    Result: 

    A 

    REPLACE NO. 1 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    B 

    See step  7

  7. REPLACE NO. 1 HV SUPPLY STACK SUB-ASSEMBLY 

    Refer to REMOVAL [08/2020 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

  8. READ VALUE USING TECHSTREAM (HYBRID/EV BATTERY CELL 36 TO 70 VOLTAGE) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
      NOTE:

      Do not turn the power switch on (READY).

    3. Enter the following menus: Powertrain / HV Battery / Data List / Hybrid/EV Battery Cell 36 to 70 Voltage.
    4. Read the value of data list items "Hybrid/EV Battery Cell 36 Voltage" through "Hybrid/EV Battery Cell 70 Voltage" and make a note if the value of any is 1.6 V or less.

      Powertrain > HV Battery > Data List 

      Tester Display
      Hybrid/EV Battery Cell 36 Voltage
      Hybrid/EV Battery Cell 37 Voltage
      Hybrid/EV Battery Cell 38 Voltage
      Hybrid/EV Battery Cell 39 Voltage
      Hybrid/EV Battery Cell 40 Voltage
      Hybrid/EV Battery Cell 41 Voltage
      Hybrid/EV Battery Cell 42 Voltage
      Hybrid/EV Battery Cell 43 Voltage
      Hybrid/EV Battery Cell 44 Voltage
      Hybrid/EV Battery Cell 45 Voltage
      Hybrid/EV Battery Cell 46 Voltage
      Hybrid/EV Battery Cell 47 Voltage
      Hybrid/EV Battery Cell 48 Voltage
      Hybrid/EV Battery Cell 49 Voltage
      Hybrid/EV Battery Cell 50 Voltage
      Hybrid/EV Battery Cell 51 Voltage
      Hybrid/EV Battery Cell 52 Voltage
      Hybrid/EV Battery Cell 53 Voltage
      Hybrid/EV Battery Cell 54 Voltage
      Hybrid/EV Battery Cell 55 Voltage
      Hybrid/EV Battery Cell 56 Voltage
      Hybrid/EV Battery Cell 57 Voltage
      Hybrid/EV Battery Cell 58 Voltage
      Hybrid/EV Battery Cell 59 Voltage
      Hybrid/EV Battery Cell 60 Voltage
      Hybrid/EV Battery Cell 61 Voltage
      Hybrid/EV Battery Cell 62 Voltage
      Hybrid/EV Battery Cell 63 Voltage
      Hybrid/EV Battery Cell 64 Voltage
      Hybrid/EV Battery Cell 65 Voltage
      Hybrid/EV Battery Cell 66 Voltage
      Hybrid/EV Battery Cell 67 Voltage
      Hybrid/EV Battery Cell 68 Voltage
      Hybrid/EV Battery Cell 69 Voltage
      Hybrid/EV Battery Cell 70 Voltage
    5. Turn the power switch off.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  9

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

    Be sure to wear insulated gloves and protective goggles.

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

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the No. 1 HV battery hose.

      Refer to PROCEDURE - Step 21 [08/2020 - 08/2021] , or refer to PROCEDURE - Step 21 [08/2021 - 09/2022] , or refer to PROCEDURE - Step 21 [09/2022 - ]

    3. Check the connector connections and contact pressure of the relevant terminals for the battery ECU assembly.

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [06/2018 - ]

      OK

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

      GTY946857Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result

      Result Proceed to
      OK A
      Not connected securely The terminals are not damaged or corroded B
      Not connected securely The terminals are damaged or corroded C
    4. Install the No. 1 HV battery hose.

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    A 

    See step  10

  10. CHECK NO. 2 HV SUPPLY STACK SUB-ASSEMBLY (HV BATTERY CELL VOLTAGE) 
    WARNING:
    • Be sure to wear insulated gloves and protective goggles.
    • Disconnect only the connector corresponding to the HV battery cell to be checked. Do not disconnect the other connectors.
    NOTE:

    Make sure to use tester probes with a diameter of approximately 0.5 mm (0.0197 in.) when measuring the voltage of each HV battery cell.

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

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the appropriate service information because this may cause a malfunction.

    2. Remove the No. 1 HV battery hose.

      Refer to PROCEDURE - Step 21 [08/2020 - 08/2021]vvv , or refer to PROCEDURE - Step 21 [08/2021 - 09/2022] , or refer to PROCEDURE - Step 21 [09/2022 - ]

    3. Disconnect the y13 battery ECU assembly connector.
      GTY946857Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the voltage according to the value(s) in the table below.

      HINT: 

      Measure the voltage of the HV battery cells whose value in the data list was 1.6 V or less only.

      GTY947027Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery ECU Assembly)      		 - -
      HV Battery Cell Tester Connection Condition
      36 y13-1 (VAD) - y13-13 (VA36) Always
      37 y13-13 (VA36) - y13-25 (VA37) Always
      38 y13-25 (VA37) - y13-2 (VA38) Always
      39 y13-2 (VA38) - y13-14 (VA39) Always
      40 y13-14 (VA39) - y13-26 (VA40) Always
      41 y13-26 (VA40) - y13-3 (VA41) Always
      42 y13-3 (VA41) - y13-15 (VA42) Always
      43 y13-15 (VA42) - y13-27 (VA43) Always
      44 y13-27 (VA43) - y13-4 (VA44) Always
      45 y13-4 (VA44) - y13-16 (VA45) Always
      46 y13-16 (VA45) - y13-28 (VA46) Always
      47 y13-28 (VA46) - y13-5 (VA47) Always
      48 y13-5 (VA47) - y13-17 (VA48) Always
      49 y13-17 (VA48) - y13-29 (VA49) Always
      50 y13-29 (VA49) - y13-6 (VA50) Always
      51 y13-6 (VA50) - y13-18 (VA51) Always
      52 y13-18 (VA51) - y13-30 (VA52) Always
      53 y13-30 (VA52) - y13-7 (VA53) Always
      54 y13-7 (VA53) - y13-19 (VA54) Always
      55 y13-19 (VA54) - y13-31 (VA55) Always
      56 y13-31 (VA55) - y13-8 (VA56) Always
      57 y13-8 (VA56) - y13-20 (VA57) Always
      58 y13-20 (VA57) - y13-32 (VA58) Always
      59 y13-32 (VA58) - y13-9 (VA59) Always
      60 y13-9 (VA59) - y13-21 (VA60) Always
      61 y13-21 (VA60) - y13-33 (VA61) Always
      62 y13-33 (VA61) - y13-10 (VA62) Always
      63 y13-10 (VA62) - y13-22 (VA63) Always
      64 y13-22 (VA63) - y13-34 (VA64) Always
      65 y13-34 (VA64) - y13-11 (VA65) Always
      66 y13-11 (VA65) - y13-23 (VA66) Always
      67 y13-23 (VA66) - y13-35 (VA67) Always
      68 y13-35 (VA67) - y13-12 (VA68) Always
      69 y13-12 (VA68) - y13-24 (VA69) Always
      70 y13-24 (VA69) - y13-36 (VA70) Always
      WARNING:

      Make sure not to cross the electrodes of an electrical tester measurement terminals.

      NOTE:

      Make sure to check the polarity of each terminal (positive (+) or negative (-)) before connecting a tester.

      Result

      Result Proceed to
      The voltage between the terminals is 1.6 V or less. A
      Other than above B
    5. Reconnect the y13 battery ECU assembly connector.
    6. Install the No. 1 HV battery hose.

    Result: 

    B 

    REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    A 

    See step  11

  11. CHECK BATTERY ECU ASSEMBLY (VAD - VA70) 
    NOTE:

    Make sure to use tester probes with a diameter of approximately 0.5 mm (0.0197 in.) when measuring the voltage.

    1. Remove the battery ECU assembly.

      Refer to REMOVAL [08/2020 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

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

      HINT: 

      Only inspect the terminals of the battery ECU assembly which correspond to the HV battery cells which measured 1.6 V or less in the previous step.

      GTY946988Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Battery ECU Assembly)      		 - -

      Standard Voltage

      HV Battery Cell Tester Connection
      (Tester Probe Polarity)      		 Condition Specified Condition
      36 y13-1 (VAD) (+) - y13-13 (VA36) (-) Always 0.3 to 1.0 V
      37 y13-13 (VA36) (+) - y13-25 (VA37) (-) Always 0.3 to 1.0 V
      38 y13-25 (VA37) (+) - y13-2 (VA38) (-) Always 0.3 to 1.0 V
      39 y13-2 (VA38) (+) - y13-14 (VA39) (-) Always 0.3 to 1.0 V
      40 y13-14 (VA39) (+) - y13-26 (VA40) (-) Always 0.3 to 1.0 V
      41 y13-26 (VA40) (+) - y13-3 (VA41) (-) Always 0.3 to 1.0 V
      42 y13-3 (VA41) (+) - y13-15 (VA42) (-) Always 0.3 to 1.0 V
      43 y13-15 (VA42) (+) - y13-27 (VA43) (-) Always 0.3 to 1.0 V
      44 y13-27 (VA43) (+) - y13-4 (VA44) (-) Always 0.3 to 1.0 V
      45 y13-4 (VA44) (+) - y13-16 (VA45) (-) Always 0.3 to 1.0 V
      46 y13-16 (VA45) (+) - y13-28 (VA46) (-) Always 0.3 to 1.0 V
      47 y13-28 (VA46) (+) - y13-5 (VA47) (-) Always 0.3 to 1.0 V
      48 y13-5 (VA47) (+) - y13-17 (VA48) (-) Always 0.3 to 1.0 V
      49 y13-17 (VA48) (+) - y13-29 (VA49) (-) Always 0.3 to 1.0 V
      50 y13-29 (VA49) (+) - y13-6 (VA50) (-) Always 0.3 to 1.0 V
      51 y13-6 (VA50) (+) - y13-18 (VA51) (-) Always 0.3 to 1.0 V
      52 y13-18 (VA51) (+) - y13-30 (VA52) (-) Always 0.3 to 1.0 V
      53 y13-30 (VA52) (+) - y13-7 (VA53) (-) Always 0.3 to 1.0 V
      54 y13-7 (VA53) (+) - y13-19 (VA54) (-) Always 0.3 to 1.0 V
      55 y13-19 (VA54) (+) - y13-31 (VA55) (-) Always 0.3 to 1.0 V
      56 y13-31 (VA55) (+) - y13-8 (VA56) (-) Always 0.3 to 1.0 V
      57 y13-8 (VA56) (+) - y13-20 (VA57) (-) Always 0.3 to 1.0 V
      58 y13-20 (VA57) (+) - y13-32 (VA58) (-) Always 0.3 to 1.0 V
      59 y13-32 (VA58) (+) - y13-9 (VA59) (-) Always 0.3 to 1.0 V
      60 y13-9 (VA59) (+) - y13-21 (VA60) (-) Always 0.3 to 1.0 V
      61 y13-21 (VA60) (+) - y13-33 (VA61) (-) Always 0.3 to 1.0 V
      62 y13-33 (VA61) (+) - y13-10 (VA62) (-) Always 0.3 to 1.0 V
      63 y13-10 (VA62) (+) - y13-22 (VA63) (-) Always 0.3 to 1.0 V
      64 y13-22 (VA63) (+) - y13-34 (VA64) (-) Always 0.3 to 1.0 V
      65 y13-34 (VA64) (+) - y13-11 (VA65) (-) Always 0.3 to 1.0 V
      66 y13-11 (VA65) (+) - y13-23 (VA66) (-) Always 0.3 to 1.0 V
      67 y13-23 (VA66) (+) - y13-35 (VA67) (-) Always 0.3 to 1.0 V
      68 y13-35 (VA67) (+) - y13-12 (VA68) (-) Always 0.3 to 1.0 V
      69 y13-12 (VA68) (+) - y13-24 (VA69) (-) Always 0.3 to 1.0 V
      70 y13-24 (VA69) (+) - y13-36 (VA70) (-) Always 0.3 to 1.0 V
      NOTE:
      • Make sure to check the polarity of each terminal (positive (+) or negative (-)) before connecting a tester.
      • Be sure to set the toyota electrical tester to diode range when performing this test.
      • Read the voltage after the value has stabilized.
      • In order to avoid damaging the terminals of the battery ECU assembly, make sure to use tester probes with a diameter of approximately 0.5 mm (0.0197 in.) when measuring the voltage of the battery ECU assembly.

      Result

      Result Proceed to
      The voltage between the terminals is 0.3 to 1.0 V. A
      Other than above B
    3. Install the battery ECU assembly.

    Result: 

    A 

    REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    B 

    See step  12

  12. REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY 

    Refer to REMOVAL [08/2020 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

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