ADAPTIVE VARIABLE SUSPENSION SYSTEM, Diagnostic DTC:C1789

DTC Code DTC Name
C1789 Vehicle Identification Malfunction

DESCRIPTION


DTC Code Detection Condition Trouble Area
C1789

Either condition is met:


  • The vehicle identification information is not stored.

  • Vehicle identification information that is different from the stored information has been received 3 times.

  • CAN communication system

  • Vehicle identification information

  • Power management control ECU

  • Absorber control ECU

CAUTION / NOTICE / HINT

Note


  • Before performing troubleshooting, inspect the connectors of related circuits.

  • If DTC C1781 (Suspension Control ECU Malfunction) is output at the same time, perform troubleshooting for C1781 first Click here.

  • If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first Click here.

  • Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation (See page ); 2) DTC inspection (See page ); and 3) GTS inspection (ECU Data List or Active Test Click here. If no malfunctions are found in other areas, replace the absorber control ECU.

  • When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met Click here.

PROCEDURE


  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output (for LHD) B
      CAN DTC is output (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    A

  2. CHECK VEHICLE IDENTIFICATION INFORMATION STATUS


    1. Check that vehicle identification information has been stored Click here.

      Result
      Result Proceed to
      Information stored A
      Information not stored B

    B

    PERFORM VEHICLE IDENTIFICATIONINFORMATION REGISTRATION Click here

    A

  3. CHECK RELATED PART


    1. If the DTC was output as a result of the replacement of a related part, replace the part with one that has a correct part number.

      Related Part Power management control ECU

      Note

      When removing a related part to check it, be sure to follow the appropriate procedures and precautions.

      Refer to the following procedures to remove the power management control ECU Click here.

      Tech Tips

      If parts have not been replaced and DTC C1789 is output, there may be an internal malfunction in the absorber control ECU. Therefore, replace the absorber control ECU Click here.


    NEXT

  4. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Turn the power switch off.

    3. Check if DTC C1789 is output Click here.

      OK
      DTC C1789 is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE ABSORBER CONTROL ECU Click here