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Home >> Lexus >> 2021 >> LS 500h RWD >> Repair and Diagnosis (Single Page) >> Suspension >> Suspension Control Systems >> Adaptive Variable Suspension System - Diagnostics - Introduction >> Adaptive Variable Suspension System >> Test Mode Procedure [10/2017 - 10/2023] >> Test Mode Procedure [10/2017 - 10/2023]
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Test Mode Procedure [10/2017 - 10/2023]

  1. TEST MODE PROCEDURE 
    NOTE:

    After replacing the absorber control ECU, it is necessary to perform registration of vehicle identification information. Vehicle identification information is automatically acquired when the system enters test mode.

    1. Turn the power switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Turn the Techstream on.
    5. Enter the following menus: Chassis / Adaptive Variable Suspension System / Utility / Signal Check.

      Chassis > Adaptive Variable Suspension System > Utility 

      Tester Display
      Signal Check
    6. Confirm that the system is in test mode by checking that the "SPORT S+" indicator in the combination meter assembly is blinking at 0.125-second intervals (0.125 seconds on and 0.125 seconds off).

      HINT: 

      When vehicle identification information has not been acquired, the "Sport S+" indicator in the combination meter assembly blinks at 1-second intervals (1 second on and 1 second off). After vehicle identification information is acquired, the "Sport S+" indicator in the combination meter assembly blinks at 0.125-second intervals (0.125 seconds on and 0.125 seconds off).

    7. With the vehicle stationary on a level surface, wait for 1 second or more.
    8. Read the test mode DTCs by following the prompts on the Techstream screen.
    9. End test mode by following the prompts on the Techstream screen.
    10. Turn the power switch off and disconnect the Techstream from the DLC3.
  2. TEST MODE DTC CHART 
    DTC Code Detection Item Trouble Area Deletion Condition Link
    C1796 Front acceleration sensor RH circuit malfunction
    • Acceleration sensor assembly RH
    • Acceleration sensor assembly RH circuit
    • Absorber control ECU
    With the vehicle stationary on a level surface, an acceleration sensor value that is within -1.96 to 1.96 m/s2 is received from the acceleration sensor for 1 second or more. Refer to DTC C1715: Front Acceleration Sensor RH Malfunction; DTC C1716: Front Acceleration Sensor LH Malfunction; DTC C1717: Rear Acceleration Sensor Malfunction; DTC C1796: Front Acceleration Sensor RH Malfunction (Test Mode DTC); DTC C1797: Front Acceleration Sensor LH Malfunction (Test Mode DTC); DTC C1798: Rear Acceleration Sensor Malfunction (Test Mode DTC) [10/2017 - 10/2023]
    C1797 Front acceleration sensor LH circuit malfunction
    • Acceleration sensor assembly LH
    • Acceleration sensor assembly LH circuit
    • Absorber control ECU
    C1798 Rear acceleration sensor circuit malfunction
    • Rear acceleration sensor (absorber control ECU)
    • Absorber control ECU