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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 116 (Hybrid Control System (AWD) - Diagnostic Codes (4 Of 6)) >> HYBRID CONTROL SYSTEM (for AWD) >> DTC P0AD9-15: Hybrid/EV Battery Positive Contactor Circuit Short to Auxiliary Battery or Open [12/2019 - 11/2023] >> Procedure

DTC P0AD9-15: Hybrid/EV Battery Positive Contactor Circuit Short to Auxiliary Battery or Open [12/2019 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. READ VALUE USING GTS (SMRB STATUS) 
    1. Read the Data List.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      SMRB Status

      Standard

      Tester Display Condition Specified Condition
      SMRB Status Ignition switch ON OFF
    2. Turn the ignition switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  2

  2. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) 

    Refer to PROCEDURE - Step 1

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    CONNECT SECURELY 

    Result: 

    OK 

    See step  3

  3. CHECK CONNECTOR CONNECTION CONDITION (FLOOR WIRE CONNECTOR) 

    Refer to PROCEDURE - Step 5

    Result

    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  4

  4. CHECK CONNECTOR CONNECTION CONDITION (HV BATTERY JUNCTION BLOCK ASSEMBLY CONNECTOR) 

    Refer to PROCEDURE - Step 8

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    CHECK FOR INTERMITTENT PROBLEMS 

    Refer to CHECK FOR INTERMITTENT PROBLEMS [12/2019 - 11/2023]

    Result: 

    NG 

    CONNECT SECURELY 

  5. CHECK HARNESS AND CONNECTOR (SMRB VOLTAGE) 
    1. Turn the ignition switch to ON.
    2. Measure the voltage according to the value(s) in the table below.
      GTY894638Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU)      		 - -

      Standard Voltage

      Tester Connection Condition Specified Condition
      A32-16 (SMRB) - Body ground Ignition switch ON Below 1 V
    3. Turn the ignition switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  6

  6. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) 

    Refer to PROCEDURE - Step 1

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    Result: 

    NG 

    CONNECT SECURELY 

  7. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BODY GROUND) 
    1. Disconnect the A32 hybrid vehicle control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A32-16 (SMRB) - Body ground Ignition switch off 25.0 to 59.0 Ω
      GTY851788Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)
    3. Reconnect the A32 hybrid vehicle control ECU connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (SHORT TO POWER SUPPLY WIRES) 
    WARNING:

    Be sure to wear insulated gloves.

    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. Remove the No. 10 HV battery shield panel.

      Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    3. Disconnect the M56 HV battery junction block assembly connector.
      GTY911531Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Disconnect the A32 hybrid vehicle control ECU connector.
    5. Turn the ignition switch to ON.
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A32-16 (SMRB) or M56-1 (SMRB) - Body ground Ignition switch ON Below 1 V
      NOTE:

      Turning the ignition switch to ON with the hybrid vehicle control ECU connector and the HV battery junction block assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      GTY909057Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)
      *b Front view of wire harness connector
      (to HV Battery Junction Block Assembly)
    7. Turn the ignition switch off.
    8. Reconnect the A32 hybrid vehicle control ECU connector.
    9. Reconnect the M56 HV battery junction block assembly connector.
    10. Install the No. 10 HV battery shield panel.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK CONNECTOR CONNECTION CONDITION (FLOOR WIRE CONNECTOR) 

    Refer to PROCEDURE - Step 5

    Result

    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - HV BATTERY JUNCTION BLOCK ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

    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. Remove the No. 10 HV battery shield panel.

      Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    3. Disconnect the M56 HV battery junction block assembly connector.
      GTY911531Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Disconnect the A32 hybrid vehicle control ECU connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      A32-16 (SMRB) - M56-1 (SMRB) Ignition switch off Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      A32-16 (SMRB) or M56-1 (SMRB) - Body ground and other terminals Ignition switch off 10 kΩ or higher
      GTY909057Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)
      *b Front view of wire harness connector
      (to HV Battery Junction Block Assembly)
    6. Reconnect the A32 hybrid vehicle control ECU connector.
    7. Reconnect the M56 HV battery junction block assembly connector.
    8. Install the No. 10 HV battery shield panel.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (HV BATTERY JUNCTION BLOCK ASSEMBLY - BODY GROUND) 
    WARNING:

    Be sure to wear insulated gloves.

    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. Remove the No. 10 HV battery shield panel.

      Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    3. Disconnect the M56 HV battery junction block assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M56-3 (GND) - Body ground Ignition switch off Below 1 Ω
      GTY842647Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to HV Battery Junction Block Assembly)
    5. Reconnect the M56 HV battery junction block assembly connector.
    6. Install the No. 10 HV battery shield panel.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  12

  12. INSPECT HV BATTERY JUNCTION BLOCK ASSEMBLY (SMRB) 
    WARNING:

    Be sure to wear insulated gloves.

    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. Remove the No. 10 HV battery shield panel.

      Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    3. Disconnect the M56 HV battery junction block assembly connector.
    4. Measure the resistance according to the value(s) in the table below.
      GTY877341Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (HV Battery Junction Block Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      M56-1 (SMRB) - M56-3 (GND) -40 to 80°C (-40 to 176°F) 25.0 to 59.0 Ω
    5. Reconnect the M56 HV battery junction block assembly connector.
    6. Install the No. 10 HV battery shield panel.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    CHECK FOR INTERMITTENT PROBLEMS 

    Refer to CHECK FOR INTERMITTENT PROBLEMS [12/2019 - 11/2023]

    Result: 

    NG 

    REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

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