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Skid Control Buzzer Circuit: Wiring Diagram

Fig 1: Skid Control Buzzer Circuit - Wiring Diagram
G04113276Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE: When replacing the skid control ECU, perform INITIALIZATION  of linear solenoid valve and calibration .
  1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (SKID CONTROL BUZZER) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch on and turn the intelligent tester main switch on.
    3. Select ACTIVE TEST mode on the intelligent tester.

      ABS / VSC / TRAC: 

      ABS / VSC / TRAC ITEM

      Item (Display) Vehicle Condition/Test Details Diagnostic Note
      BUZZER Turns skid control buzzer ON/OFF Buzzer can be heard
    4. Check that the buzzer sounds/stops when turning the skid control buzzer on/off using the intelligent tester.

      Result 

      RESULT REFERENCE

      Condition Proceed to
      Buzzer sounds/stops A
      Buzzer does not sound or sounds constantly B

      HINT:

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

    A : END 

    B : GO TO NEXT STEP 

  2. INSPECT SKID CONTROL BUZZER (POWER SOURCE TERMINAL) 
    1. Disconnect the skid control buzzer connector.
    2. Turn the ignition switch on.
    3. Measure the voltage according to the value(s) in the table below.

      Voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      V8-2 - Body ground Ignition switch on 10 to 14 V
      Fig 2: Disconnecting Skid Control Buzzer Connector
      G04113277Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : GO TO NEXT STEP 

  3. INSPECT SKID CONTROL BUZZER 
    1. Disconnect the skid control buzzer connector.
    2. Apply battery negative voltage to terminal 1, and battery positive voltage to terminal 2 of the skid control buzzer, and then check that the buzzer sounds.

      OK: Skid control buzzer sounds. 

      Fig 3: Applying Battery Negative Voltage To Terminal 1, And Positive Voltage To Terminal 2 Of Skid Control Buzzer
      G04113278Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPLACE SKID CONTROL BUZZER 

    OK : GO TO NEXT STEP 

  4. CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND SKID CONTROL BUZZER) 
    1. Disconnect the skid control buzzer connector and the skid control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      S39-33 (VBZ) - V8-2 (VBZ) Below 1 Ω
      S39-12 (BZ) - V8-1 (BZ) Below 1 Ω
    3. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      S39-33 (VBZ) - Body ground 10 kΩ or higher
      S39-12 (BZ) - Body ground 10 kΩ or higher
      Fig 4: Disconnecting Skid Control Buzzer Connector And Skid Control ECU Connector
      G04113279Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : GO TO NEXT STEP 

  5. INSPECT SKID CONTROL ECU (GND TERMINAL) 
    1. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      S38-1 (GND1) - Body ground Below 1 Ω
      S39-2 (GND2) - Body ground Below 1 Ω
      S39-1 (GND3) - Body ground Below 1 Ω
      S40-2 (GND4) - Body ground Below 1 Ω
      S40-1 (GND5) - Body ground Below 1 Ω
      S41-4 (GND6) - Body ground Below 1 Ω
      Fig 5: Inspecting Skid Control ECU (GND Terminal)
      G04113280Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : REPLACE SKID CONTROL ECU 

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