Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual: Parking Brake System




  • If the battery is connected, the parking brake will operate when the electric parking brake switch assembly is pulled to the lock side even if the engine switch is off, Do not operate the electric parking brake switch assembly with the battery connected unless specified in the repair manual.
  • To prevent the electric parking brake system from operating when the shift lever is moved, make sure that AUTO function (shift-linked function) is off.
  • After the engine switch is turned off, the parking brake ECU assembly (brake actuator assembly) and parking brake actuator assembly continue operating for 20 seconds. If a connector is disconnected during this period, a DTC may be stored.
  • If any part is removed and installed, check for DTCs to make sure that the normal system code is output after all parts are installed.

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  • Replacing a part with an incorrect part may affect the performance of the brake system or lead to a hazardous situation. When replacing a part, always use a part with the same part number or equivalent.
  • When servicing the brake system, keep the parts and areas around the parts clean.
  • If the vehicle is equipped with a mobile communication system, read the precautions of Introduction section.

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


    • 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 (airbag sensor assembly*1 or yaw rate sensor assembly*2).
    • When the electric parking brake switch assembly is pulled to the lock side 2 times (2 lock operations), the maximum amount of braking force is applied.


    *1: for Optitron Meter Type

    *2: for TFT Meter Type

Problem Symptoms Table



Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

Parking Brake System


Suspected Area


Brake drag

Electric parking brake actuator assembly

    Operation Method
    OPERATION METHOD PROCEDURE 1. PRECAUTION Click here 2. PARKING BRAKE FORCED RELEASE CAUTION: Work on a level surface to ensure safety. NOTICE: To release the parking brake, follow the procedure ...


    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual > Front Door Opening Trim Weatherstrip: Installation
    INSTALLATION CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH side and LH side. The following procedure is for the LH side. PROCEDURE 1. INSTALL FRONT DOOR OPENING TRIM WEATHERSTRIP (a) Align the alignment mark on the front door opening trim weatherstrip with the flange on the ...

    Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual > Power Steering System: Torque Sensor Zero Point Adjustment Incomplete (C1516)
    DESCRIPTION This DTC does not indicate a malfunction. The power steering ECU assembly stores this DTC when it determines that torque sensor zero point calibration has not completed. DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition ...

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