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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 78 (Motor Generator Control System (AWD) - Diagnostic Codes (1 Of 5)) >> MOTOR GENERATOR CONTROL SYSTEM (for AWD) >> DTC P0A08-12: DC/DC Converter Status Circuit Short to Battery; DTC P0A08-14: DC/DC Converter Status Circuit Short to Ground or Open [12/2019 - 11/2023] >> Procedure

DTC P0A08-12: DC/DC Converter Status Circuit Short to Battery; DTC P0A08-14: DC/DC Converter Status Circuit Short to Ground or Open [12/2019 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) 

    See step  3

    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  2

  2. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - IGCT RELAY) 
    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 on (READY), unless instructed by the repair information because this may cause a malfunction.

    2. Disconnect the A55 inverter with converter assembly connector.
    3. Remove the IGCT relay from the No. 5 floor relay block and No. 5 floor junction block assembly.
    4. Measure the resistance according to the value(s) in the table below.
      GTY902778Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 5 Floor Relay Block and No. 5 Floor Junction Block Assembly *2 IGCT Relay
      *a Front view of wire harness connector
      (to Inverter with Converter Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A55-26 (IGCT) - 5 (IGCT relay) Ignition switch off Below 1 Ω
    5. Install the IGCT relay.
    6. Reconnect the A55 inverter with converter assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE INVERTER WITH CONVERTER ASSEMBLY 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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