2008 Lexus RX 400h FWDFACTORY OEM SERVICE PROCEDURE

Electronically Controlled Brake System: Calibration

  1. DESCRIPTION 

    After replacing the VSC relevant components or performing "Front wheel alignment adjustment", clear and read the sensor calibration data. Follow the chart to perform calibration.

    PARTS OPERATION REFERENCE

    Replacement / Adjustment Parts Necessary Operation
    Skid control ECU Yaw rate and deceleration sensor zero point calibration.
    Yaw rate and deceleration sensor
    1. Clearing zero point calibration data.
    2. Yaw rate and deceleration sensor zero point calibration.
    Front wheel alignment
    1. Clearing zero point calibration data.
    2. Yaw rate and deceleration sensor zero point calibration.
  2. CLEAR ZERO POINT CALIBRATION (WHEN USING TECHSTREAM): 
    1. Connect Techstream to the DLC3.
    2. Turn the ignition switch on.
    3. Operate Techstream to erase the codes (select "Reset Memory").

      HINT:

      Refer to the Techstream operator's manual for further details.

    4. Using Techstream, perform zero point calibration of the yaw rate and deceleration sensor.
  3. PERFORM ZERO POINT CALIBRATION OF YAW RATE AND DECELERATION SENSOR (WHEN USING TECHSTREAM): 
    NOTE:
    • While obtaining the zero point, do not vibrate the vehicle by tilting, moving or shaking it and keep it in a stationary condition. (Do not turn the ignition switch on.)
    • Be sure to do this on a level surface (with an inclination of less than 1 degree).
    1. Procedures for test mode.
      1. Check that the steering wheel is in the straight-ahead position and move the shift lever to the P position and apply the parking brake.
        NOTE: DTC C1210/36 and C1336/39 will be recorded if the shift lever is not in the P position.
      2. Connect Techstream to the DLC3.
      3. Turn the ignition switch on.
      4. Set Techstream to test mode (select "Test Mode").

        HINT:

        Refer to the Techstream operator's manual for further details.

    2. Obtain the zero point of the yaw rate and deceleration sensor.
      1. Keep the vehicle in the stationary condition on a level surface for 2 seconds or more.
      2. Check that the ABS and brake control warning lights blink and "CHECK VSC SYSTEM" is displayed on the multi information display (test mode).

        HINT:

        • If the ABS and brake control warning lights do not blink and/or "CHECK VSC SYSTEM" is not displayed on the multi information display, perform zero point calibration again.
        • The zero point calibration is performed only once after the system enters the test mode.
        • Calibration cannot be performed again until the stored data is cleared once.
          • Fig 1: ABS And Brake Control Warning Lights Blinking Pattern
          G05202649Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Turn the ignition switch off and disconnect Techstream.
  4. CLEAR ZERO POINT CALIBRATION (WHEN USING SST CHECK WIRE): 
    1. Turn the ignition switch on.
    2. Using SST, connect and disconnect terminals TS and CG of the DLC3 4 times or more within 8 seconds.

      SST 09843-18040 

      Fig 2: Identifying DLC3 Connector Terminals
      G04977895Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check that no codes other than ABS code 42, VSC code 45 and Electronically Controlled Brake code 48, 66, or 95 are stored in the diagnostic system.

      HINT:

      The ABS warning light and multi information display do not indicate the normal system code.

      Fig 3: ABS And Electronically Controlled Brake Code Blinking Pattern
      G05202651Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the SST from the terminals of the DLC3.
    5. Using a check wire, perform zero point calibration of the yaw rate and deceleration sensor.
  5. PERFORM ZERO POINT CALIBRATION OF YAW RATE AND DECELERATION SENSOR (WHEN USING SST CHECK WIRE): 
    NOTE:
    • While obtaining the zero point, do not vibrate the vehicle by tilting, moving or shaking it and keep it in a stationary condition. (Do not turn the ignition switch on.)
    • Be sure to do this on a level surface (with an inclination of less than 1 degree).
    1. Procedures for test mode.
      1. Turn the ignition switch off.
      2. Using SST, connect terminals TS and CG of the DLC3.

        SST 09843-18040 

      3. Check that the steering wheel is in the straight-ahead position and move the shift lever to the P position.
        NOTE: DTC C1210/36 and C1336/39 will be recorded if the shift lever is not in the P position.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.