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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 89 (Electric Parking Brake System (HV) - Diagnostics - Introduction) >> ELECTRIC PARKING BRAKE SYSTEM (for HV Model) >> Precaution [12/2019 - 10/2022] >> Precaution [12/2019 - 10/2022]

Precaution [12/2019 - 10/2022]

WARNING: This page is about a different variant/trim than selected.
  1. PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL 
    NOTE:

    When disconnecting the cable from the negative (-) auxiliary battery terminal, initialize the following system(s) after the cable is reconnected.

    System See Procedure
    Lane Control System Refer to INITIALIZATION [12/2019 - 09/2020] , or refer to INITIALIZATION [09/2020 - 10/2021] , or refer to INITIALIZATION [10/2021 - 10/2022]
    Parking Support Brake System
    Pre-collision System
    Lighting System (EXT) (w/ AFS)
    Parking Assist Monitor System
    Panoramic View Monitor System
    Power Door Lock Control System
    Power Back Door System
  2. TROUBLESHOOTING PRECAUTIONS 
    1. When inspecting the rear brakes, disconnect the connector or disconnect the cable from the negative (-) auxiliary battery terminal in order to shut off the supply of electrical power.
      WARNING:
      • Do not perform the rear brake inspection while either the connector or the negative (-) auxiliary battery terminal are connected.
      • The rear disc brake piston could operate, resulting in an accident such as hands being caught.
    2. When disconnecting a connector or removing a fuse or relay, make sure that the ignition switch has been off, the brake pedal has not been depressed, and the driver door has been closed for 4 minutes or more*.
      1. *: The electric parking brake may still operate up to 60 minutes depending on the state of the vehicle after the ignition switch is turned off, so be sure to perform the work procedures with the vehicle on a level surface.
    3. When any parts have been removed or installed, check for DTCs after completion of installation to confirm that the system is operating correctly.

      HINT: 

      After performing work procedures such as installation, if the parking brake indicator light (red) is blinking, the parking brake must be released.

  3. HANDLING PRECAUTIONS 
    1. When tilting the vehicle to perform work after parking the vehicle on a level surface, the braking force may not be sufficient. Make sure to pull the electric parking brake switch (electric parking brake switch assembly) to the lock side 2 times (2 lock operations).

      HINT: 

      • The electric parking brake system determines the amount of force used to operate the parking brake according to the tilt angle detected by the deceleration sensor (yaw rate sensor).
      • When the parking brake indicator (red) is illuminated after the electric parking brake switch (electric parking brake switch assembly) has been pulled to the lock side, the maximum amount of braking force is applied if the electric parking brake switch (electric parking brake switch assembly) is pulled to the lock side one more time.
    2. The parking brake indicator light blinks (red) when the ignition switch is turned to ON after replacing the No. 2 skid control ECU (brake actuator assembly). Operate the electric parking brake switch (electric parking brake switch assembly) to turn off the parking brake indicator light.
  4. PRECAUTIONS FOR TOWING VEHICLES 
    1. For towing precautions: Refer to PRECAUTION [12/2019 - 11/2023]
  5. PARKING BRAKE FORCED RELEASE METHOD 
    1. For the parking brake forced release method: Refer to OPERATION METHOD [12/2019 - ]
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