AIR SUSPENSION SYSTEM, Diagnostic DTC:C1789

DTC Code DTC Name
C1789 Vehicle Identification Malfunction

DESCRIPTION


DTC No. DTC Detection Condition Trouble Area
C1789

When one of the following conditions is met:


  • Vehicle identification information not registered.

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

  • Vehicle identification information not registered

  • Power management control ECU

  • Suspension control ECU

INSPECTION PROCEDURE

Note


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

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

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

  • If the suspension control ECU is replaced, the vehicle height offset calibration and registration of vehicle identification information must be performed Click here and Click here

PROCEDURE


  1. CHECK DTC (C1781)


    1. Check for DTC C1781 Click here

      Result
      Condition Proceed to
      DTC C1781 is not output A
      DTC C1781 is output (for LHD) B
      DTC C1781 is output (for RHD) C

    B

    REPLACE SUSPENSION CONTROL ECU (for LHD) Click here

    C

    REPLACE SUSPENSION CONTROL ECU (for RHD) Click here

    A

  2. REGISTRATION OF VEHICLE IDENTIFICATION INFORMATION


    1. Perform registration of vehicle identification information Click here


    NEXT

  3. CHECK DTC (C1789)


    1. Check for DTC C1789 Click here

      Result
      Condition Proceed to
      DTC C1789 is not output A
      DTC C1789 is output B

    B

    CHECK CAN COMMUNICATION SYSTEM Click here

    A

    END

  4. CHECK CAN COMMUNICATION SYSTEM


    1. Check the CAN communication system for any malfunctions Click here.

      Result
      Condition Proceed to
      CAN communication system is normal A
      CAN communication system is malfunctioning B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  5. CHECK POWER MANAGEMENT CONTROL ECU


    1. Check if the part number of the installed power management control ECU is correct.

      OK
      A power management control ECU with the correct part number is installed.
      Result
      Condition Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG (for LHD) C
      NG (for RHD) D

    B

    REPLACE SUSPENSION CONTROL ECU (for RHD) Click here

    C

    REPLACE POWER MANAGEMENT CONTROL ECU (for LHD) Click here

    D

    REPLACE POWER MANAGEMENT CONTROL ECU (for RHD) Click here

    A

    REPLACE SUSPENSION CONTROL ECU (for LHD) Click here