DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 108 (Hybrid Control System (2WD) - Diagnostic Codes (3 Of 7)) >> HYBRID CONTROL SYSTEM (for 2WD) >> DTC P0AA6-49: Hybrid/EV Battery Voltage System Isolation Internal Electronic Failure; DTC P1C7C-49: Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure; DTC P1C7D-49: Hybrid/EV Battery Voltage System Isolation (Hybrid/EV Battery Area) Internal Electronic Failure; DTC P1C7E-49: Hybrid/EV Battery Voltage System Isolation (Transaxle Area) Internal Electronic Failure; DTC P1C7F-49: Hybrid/EV Battery Voltage System Isolation (Direct Current Area) Internal Electronic Failure [12/2019 - 11/2023] >> Caution / Notice / Hint

Caution / Notice / Hint

WARNING: This page is about a different variant/trim than selected.
WARNING:
  • When troubleshooting DTC P0AA6-49, use either a tool wrapped with vinyl insulation tape or an insulated tool. (It is extremely dangerous when a high-voltage charge passes through a non-insulated tool causing a short.)
    GTY692850Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  • Before the following operations are conducted, take precautions to prevent electric shock by turning the ignition switch off, wearing insulated gloves, and removing the service plug grip from HV battery.
    GTY588386Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Inspecting the high-voltage system
    • Disconnecting the low voltage connector of the inverter with converter assembly
    • Disconnecting the low voltage connector of the HV battery
    • Disconnecting the low voltage connector of the voltage inverter assembly (w/ 1500W voltage inverter)
  • To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.
    GTY687067Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  • After removing the service plug grip from the HV battery, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
    GTY703958Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  • After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

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

    GTY772289Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Without waiting for 10 minutes

    HINT: 

    Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

  • Make sure to insulate the high-voltage connectors and terminals of the HV battery with insulating tape after removing it.

    If the HV battery stored without insulating the connectors and terminals, electric shock or fire may result.

  • When disposing of an HV battery, make sure to return it through an authorized collection agent who is capable of handling it safely. If the HV battery is returned via the manufacturer specified route, it will be returned properly and in a safe manner by an authorized collection agent.
    GTY724560Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Dealer
    *b Battery Collection Agent
NOTE:

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

Refer to INITIALIZATION [12/2019 - 09/2020] , or refer to INITIALIZATION [09/2020 - 10/2021] , or refer to INITIALIZATION [10/2021 - 10/2022] , or refer to INITIALIZATION [10/2022 - 11/2023]

HINT: 

When measuring insulation resistance using a megohmmeter, set the megohmmeter to 500 V.