2008 Lexus GS 350 RWDFACTORY 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 procedure to perform calibration.

    CALIBRATION REFERENCE

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

      HINT:

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

  3. PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR (WHEN USING TECHSTREAM:) 
    NOTE:
    • While obtaining the zero point, do not vibrate the vehicle by tilting, moving or shaking it. Keep it in a stationary condition and do not start the engine.
    • Choose a level surface with an inclination of less than 1 degree.
    1. Procedures for Test Mode.
      1. Ensure that the steering wheel is centered, 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 the Techstream to the DLC3.
      3. Turn the engine switch on (IG).
      4. Set the 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 acceleration sensor.
      1. Keep the vehicle stationary on a level surface for 2 seconds or longer.
      2. Check that the ABS and brake control warning lights blink and VSC test mode message is indicated on the multi-information display (Test Mode).

        HINT:

        • If the ABS and brake control warning lights do not blink and VSC test mode message is not indicated on the multi-information display, perform zero point calibration again.
        • Illustrations may differ from the actual screen displayed depending on the specifications of the vehicle and customized settings.
        • 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.
    3. Turn the engine switch off and disconnect the Techstream.
      Fig 1: Blinking Pattern Chart
      G05807115Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CLEAR ZERO POINT CALIBRATION (WHEN USING SST CHECK WIRE:) 
    1. Turn the engine switch on (IG).
    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 Terminals TS And CG Of DLC3
      G05807116Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check that no codes other than ABS code 42, VSC code 45 and Electronically Controlled Brake System code 48, 66, or 95 are stored in the diagnostic system.
      Fig 3: ABS Code Blinking Pattern Chart
      G05807112Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      • The ABS warning light and multi-information display do not indicate the normal system code.
      • Illustrations may differ from the actual screen displayed depending on the specifications of the vehicle and customized settings.
    4. Remove SST from the terminals of the DLC3.
  5. PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR (WHEN USING SST CHECK WIRE:) 
    NOTE:
    • While obtaining the zero point, do not vibrate the vehicle by tilting, moving or shaking. Keep it in a stationary condition and do not start the engine.
    • Choose a level surface with an inclination of less than 1 degree.
    1. Procedures for Test Mode.
      1. Turn the engine 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.