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VSC Warning Light Remains ON: Wiring Diagram

WARNING: This page is about a different car, the 2006 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Wiring Diagram
G04052152Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE: When replacing the skid control ECU, perform zero point calibration (See CALIBRATION  ).
  1. CHECK CAN COMMUNICATION SYSTEM 
    1. Check if the CAN communication system DTC is output (See DIAGNOSIS SYSTEM ).

      Result 

      CONDITION CHART

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

    B : INSPECT CAN COMMUNICATION SYSTEM 

    A : GO TO NEXT STEP 

  2. CHECK MULTIPLEX COMMUNICATION SYSTEM 
    1. Check if the multiplex communication system DTC is output (See DTC CHECK/CLEAR ).

      Result 

      CONDITION CHART

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

    B : INSPECT MULTIPLEX COMMUNICATION SYSTEM 

    A : GO TO NEXT STEP 

  3. CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED 
    1. Check if the skid control ECU connector is securely connected.

      OK: The connector should be securely connected. 

    NG : CONNECT CONNECTOR TO ECU CORRECTLY 

    OK : GO TO NEXT STEP 

  4. CHECK BATTERY 
    1. Check the battery voltage.

      Standard voltage: 

      11 to 14 V 

    NG : CHECK AND REPLACE CHARGING SYSTEM OR BATTERY 

    OK : GO TO NEXT STEP 

  5. INSPECT COMBINATION METER ASSEMBLY 
    1. Perform Active Test of the combination meter (meter CPU) using the intelligent tester (See DATA LIST / ACTIVE TEST ).

      OK: The VSC warning (multi information display and master caution indicator light) light turns on or off in accordance with the intelligent tester. 

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See PROBLEM SYMPTOMS TABLE  ).

    NG : REPLACE COMBINATION METER ASSEMBLY 

    OK : REPLACE SKID CONTROL ECU