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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 110 (Hybrid Control System (2WD) - Diagnostic Codes (5 Of 7)) >> HYBRID CONTROL SYSTEM (for 2WD) >> DTC P1C81-49: High Voltage Power Resource Circuit Consumption Circuit Short; DTC P1C82-49: High Voltage Power Resource Circuit Over Loading [12/2019 - 11/2023] >> Procedure

DTC P1C81-49: High Voltage Power Resource Circuit Consumption Circuit Short; DTC P1C82-49: High Voltage Power Resource Circuit Over Loading [12/2019 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DTC OUTPUT (HYBRID CONTROL, MOTOR GENERATOR) 
    1. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Powertrain > Motor Generator > Trouble Codes 

      Result

      Result Proceed to
      P1C81-49 or P1C82-49 only is output, or DTCs except the ones in the tables below are also output. A
      DTCs of Hybrid Control System in the tables below are output. B
      DTCs of Motor Generator Control System in the tables below are output. C
      Malfunction Content System Relevant DTC
      Microcomputer malfunction Hybrid Control System P0606-47 Hybrid/EV Powertrain Control Module Processor Watchdog / Safety MCU Failure
      P0AFC-96 Hybrid/EV Battery Sensor Module Component Internal Failure
      P0AFC-00 Hybrid/EV Battery Sensor Module
      Power source circuit malfunction Hybrid Control System P0AFC-16 Hybrid/EV Battery Sensor Module Circuit Voltage Below Threshold
      Communication system malfunction Hybrid Control System U029A-87 Lost Communication with Hybrid/EV Battery Sensor Module Missing Message
      Sensor and actuator circuit malfunction Hybrid Control System P0ABF-11 Hybrid/EV Battery Current Sensor "A" Circuit Short to Ground
      P0ABF-15 Hybrid/EV Battery Current Sensor "A" Circuit Short to Auxiliary Battery or Open
      P0B3B-14 Hybrid/EV Battery Voltage Sensor "A" Circuit Short to Ground or Open
      P0B40-14 Hybrid/EV Battery Voltage Sensor "B" Circuit Short to Ground or Open
      P0B45-14 Hybrid/EV Battery Voltage Sensor "C" Circuit Short to Ground or Open
      P0B4A-14 Hybrid/EV Battery Voltage Sensor "D" Circuit Short to Ground or Open
      P0B4F-14 Hybrid/EV Battery Voltage Sensor "E" Circuit Short to Ground or Open
      P0B54-14 Hybrid/EV Battery Voltage Sensor "F" Circuit Short to Ground or Open
      P0B59-14 Hybrid/EV Battery Voltage Sensor "G" Circuit Short to Ground or Open
      P0B5E-14 Hybrid/EV Battery Voltage Sensor "H" Circuit Short to Ground or Open
      P0B63-14 Hybrid/EV Battery Voltage Sensor "I" Circuit Short to Ground or Open
      P0B68-14 Hybrid/EV Battery Voltage Sensor "J" Circuit Short to Ground or Open
      P0B6D-14 Hybrid/EV Battery Voltage Sensor "K" Circuit Short to Ground or Open
      P0B72-14 Hybrid/EV Battery Voltage Sensor "L" Circuit Short to Ground or Open
      P0B77-14 Hybrid/EV Battery Voltage Sensor "M" Circuit Short to Ground or Open
      P308A-13 Hybrid/EV Battery Voltage Sensor All Circuit Open
      P0AFC-62 Hybrid/EV Battery Sensor Module Signal Compare Failure
      P0B23-1C Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range
      P308A-12 Hybrid/EV Battery Voltage Sensor All Circuit Short to Auxiliary Battery
      P0ABF-00 Hybrid/EV Battery Current Sensor "A" Circuit Range/Performance
      P0ABF-28 Hybrid/EV Battery Current Sensor "A" Signal Bias Level Out of Range / Zero Adjustment Failure
      P0ABF-2A Hybrid/EV Battery Current Sensor "A" Signal Stuck In Range
      Motor Generator Control System P0A11-14 DC/DC Converter Enable Circuit Short to Ground or Open
      P0A11-12 DC/DC Converter Enable Circuit Short to Battery
      P1CCC-96 DC/DC Converter Enable Component Internal Failure
      System malfunction Motor Generator Control System P0D33-19 DC/DC Converter Circuit Current Above Threshold

      HINT: 

      1. P1C81-49 or P1C82-49 may be output as a result of the malfunction indicated by the DTCs above.
        1. The chart above is listed in inspection order of priority.
        2. Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)
    2. Turn the ignition switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 09/2020] , or refer to DIAGNOSTIC TROUBLE CODE CHART [09/2020 - 10/2021] , or refer to DIAGNOSTIC TROUBLE CODE CHART [10/2021 - 11/2023]

    Result: 

    C 

    GO TO DTC CHART (MOTOR GENERATOR CONTROL SYSTEM)  . Refer to DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 10/2021] , or refer to DIAGNOSTIC TROUBLE CODE CHART [10/2021 - 11/2023]

    Result: 

    A 

    See step  2

  2. CHECK COMPRESSOR WITH MOTOR 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. Disconnect the HV air conditioning wire connector from the inverter with converter assembly.
      GTY927253Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection
      (Tester Probe Polarity)      		 Condition Specified Condition
      m2-2 (ACPE) (Negative (-) probe) - m2-1 (ACPB) (Positive (+) probe) Ignition switch off 100 kΩ or higher
      NOTE:
      • Do not use a megohmmeter.
      • Read the resistance after the value has stabilized.
      • Be sure to inspect with connecting the tester probes to the tips of the terminal.
      GTY863095Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a HV Air Conditioning Wire
      (Inverter with Converter Assembly Side)
      *b Tip of Terminal
    4. Reconnect the HV air conditioning wire connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  3

  3. CHECK FLOOR UNDER WIRE 
    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. Disconnect the HV floor under wire connector from the inverter with converter assembly.
      GTY895926Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.
      GTY913677Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a HV Floor Under Wire
      (Inverter with Converter Assembly Side)

      Standard Resistance

      Tester Connection Condition Specified Condition
      k1-1 (CBI) - k1-2 (CEI) Ignition switch off 10 kΩ or higher
      NOTE:

      Be sure not to damage or deform the terminal being inspected.

    4. Reconnect the HV floor under wire 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 

    See step  5

  4. CHECK HV AIR CONDITIONING WIRE 
    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. Disconnect the HV air conditioning wire connector from the inverter with converter assembly.
      GTY927253Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Disconnect the HV air conditioning wire connector from the compressor with motor assembly.

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

      GTY860142Courtesy 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
      m2-2 (ACPE) - m2-1 (ACPB) Ignition switch off 10 kΩ or higher
      GTY863095Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a HV Air Conditioning Wire
      (Inverter with Converter Assembly Side)
      *b Tip of Terminal
      NOTE:

      Be sure to inspect with connecting the tester probes to the tips of the terminal.

    5. Reconnect the HV air conditioning wire connector to the inverter with converter assembly.
    6. Reconnect the HV air conditioning wire to the compressor with motor assembly.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY 

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

    Result: 

    NG 

    REPLACE HV AIR CONDITIONING WIRE 

  5. CHECK FLOOR UNDER WIRE 
    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 HV floor under wire connectors from the HV battery junction block assembly.
      GTY905700Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Disconnect the HV floor under wire connector from the inverter with converter assembly.
      GTY895926Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      k1-1 (CBI) - k1-2 (CEI) Ignition switch off 10 kΩ or higher
      GTY913677Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a HV Floor Under Wire
      (Inverter with Converter Assembly Side)
      NOTE:

      Be sure not to damage or deform the terminal being inspected.

    6. Reconnect the HV floor under wire connector to the inverter with converter assembly.
    7. Reconnect the HV floor under wire connectors to the HV battery junction block assembly.
    8. Install the No. 10 HV battery shield panel.

      Result

      Result Proceed to
      OK (w/o 1500W voltage inverter) A
      OK (w/ 1500W voltage inverter) B
      NG C

    Result: 

    A 

    REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY 

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

    Result: 

    C 

    REPLACE FLOOR UNDER WIRE 

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

    Result: 

    B 

    See step  6

  6. CHECK NO. 2 FLOOR WIRE 
    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. Disconnect the M82 and M83 No. 2 floor wire connectors from the HV battery junction block assembly.
      GTY894152Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.
      GTY943044Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a No. 2 Floor Wire
      (HV Battery Junction Block Assembly Side)

      Standard Resistance

      Tester Connection Condition Specified Condition
      M82-1 (CBP) - M83-1 (CEP) Ignition switch off 10 kΩ or higher
    4. Reconnect the M82 and M83 No. 2 floor wire connectors.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY 

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

    Result: 

    NG 

    See step  7

  7. CHECK NO. 2 FLOOR WIRE 
    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. Disconnect the M81 voltage inverter assembly connector.
      GTY864817Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Disconnect the M82 and M83 No. 2 floor wire connectors from the HV battery junction block assembly.
      GTY894152Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Measure the resistance according to the value(s) in the table below.
      GTY943044Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a No. 2 Floor Wire
      (HV Battery Junction Block Assembly Side)

      Standard Resistance

      Tester Connection Condition Specified Condition
      M82-1 (CBP) - M83-1 (CEP) Ignition switch off 10 kΩ or higher
    5. Reconnect the M82 and M83 No. 2 floor wire connectors.
    6. Reconnect the M81 voltage inverter assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE VOLTAGE INVERTER ASSEMBLY 

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

    Result: 

    NG 

    REPLACE NO. 2 FLOOR WIRE 

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