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Home >> Lexus >> 2004 >> RX 330 FWD >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Abs With EBD & BA & TRAC & VSC System - Diagnosis >> VSC Warning Light Circuit (Remains On) >> Inspection Procedure

Inspection Procedure

  1. CHECK DTC FOR VSC 

    1. Check if other DTCs are recorded. (See PRE-CHECK  )

      YES: REPAIR CIRCUIT INDICATED BY OUTPUT CODE 

      NO: Go to step 2 

  2. INSPECT SKID CONTROL ECU CONNECTOR SECURELY CONNECTED (See  HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS  ) 

    NO: CONNECT CONNECTOR TO ECU 

    YES 

  3. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (IG1 TERMINAL) 

    WHEN USING HAND-HELD TESTER: 

    1. Connect the hand-held tester to the DLC3.
    2. Start the engine.
    3. Select the DATA LIST mode on the hand-held tester.
    4. Check the voltage condition output from the ECU displayed on the hand-held tester.

    OK: "Normal" is displayed. 

    WHEN NOT USING HAND-HELD TESTER: 

    1. Disconnect the skid control ECU connector S1.
      2. Fig 1: Disconnecting The Skid Control ECU Connector S1
      G01396090Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch ON.
    3. Measure the voltage according to the value(s) in Fig 2 .

    Standard: 

    Fig 2: Voltage Standard Table
    G01396089Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NO: Go to step   5 

    OK: GO TO NEXT STEP. 

  4. CHECK VSC WARNING LIGHT 

    WHEN USING HAND-HELD TESTER: 

    1. Connect the hand-held tester to the DLC3 and start the engine.
    2. Select the item "VSC WARN LIGHT" in the ACTIVE TEST and operate the VSC warning light on the hand-held tester.
    3. Check that "ON" and "OFF" of the VSC warning light can be shown on the combination meter by the hand-held tester.

    WHEN NOT USING HAND-HELD TESTER: 

    1. Turn the ignition switch off and disconnect the connector S1 from the skid control ECU.
      2. Fig 3: Identifying Connector S1 From The Skid Control ECU
      G01396091Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to the ON position.
    3. Check that the VSC warning light goes off.

    NG: CHECK AND REPAIR VSC WARNING LIGHT CIRCUIT (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 

    OK: REPLACE ABS & TRACTION ACTUATOR ASSY (See  REPLACEMENT  ) 

  5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BODY GROUND) 
    1. Disconnect the skid control ECU connector S1.
      2. Fig 4: Disconnecting The Skid Control ECU Connector S1
      G01396093Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in Fig 5 .

    Standard: 

    Fig 5: Resistance Standard Table
    G01396092Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP. 

  6. INSPECT BATTERY 
    1. Check the battery positive voltage.

    OK: Voltage: 10 to 14V 

    NG: INSPECT CHARGING SYSTEM (See  IGNITION SYSTEM (3MZ-FE)  ) 

    OK: CHECK AND REPLACE HARNESS AND CONNECTOR (BATTERY - TERMINAL IG1) 

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