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Home >> Toyota >> 2020 >> Highlander L, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 33 (Hybrid Control System - Diagnostic Codes (3 Of 5)) >> Hybrid Control System >> DTC P0AD9-15: Hybrid/EV Battery Positive Contactor Circuit Short to Auxiliary Battery or Open [11/2023 - ] >> Procedure

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

WARNING: This page is about a different car, the 2025 Toyota Highlander and 2024 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  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 HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ]

    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.
      GTY1180511Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU)      		 - -

      Standard Voltage

      Tester Connection Condition Specified Condition
      H67-2 (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 [11/2023 - ]

    Result: 

    NG 

    CONNECT SECURELY 

  7. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BODY GROUND) 
    1. Disconnect the H67 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
      H67-2 (SMRB) - Body ground Ignition switch off 25.0 to 59.0 Ω
      GTY1180782Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)
    3. Reconnect the H67 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 [11/2023 - ]

    3. Disconnect the M56 HV battery junction block assembly connector.
      GTY911531Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Disconnect the H67 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
      H67-2 (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.

    7. Turn the ignition switch off.
    8. Reconnect the H67 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 [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 [11/2023 - ]

    3. Disconnect the M56 HV battery junction block assembly connector.
      GTY911531Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Disconnect the H67 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
      H67-2 (SMRB) - M56-1 (SMRB) Ignition switch off Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      H67-2 (SMRB) or M56-1 (SMRB) - Body ground and other terminals Ignition switch off 10 kΩ or higher
    6. Reconnect the H67 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 [11/2023 - ]

    3. Disconnect the M56 HV battery junction block assembly connector.
      GTY911531Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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
    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 [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 HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ]

    Result: 

    NG 

    REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY 

    Refer to REMOVAL [11/2023 - ]

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