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ELECTRONICALLY CONTROLLED BRAKE SYSTEM Skid Control Buzzer Circuit

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DTC Code DTC Name
  Skid Control Buzzer Circuit
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DESCRIPTION

A buzzer sounds to alert the driver when the vehicle-to-vehicle distance becomes less than the set value (for vehicles with a dynamic radar cruise control, pre-crash safety control or lane departure alert control).

Table 1. *a from IG1 NO. 4 Relay *b ECU-IG1 NO. 3 *c Skid Control Buzzer Assembly *d Skid Control ECU (Brake Booster with Master Cylinder Assembly)
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • When replacing the skid control ECU (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve (Click here).

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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PROCEDURE


  1. Click here

    CHECK BUZZER OPERATION


    1. Confirm problem symptoms of the skid control buzzer assembly according to the customer problem analysis.

      Result
      Result Proceed to
      Buzzer does not sound. A
      Buzzer sounds constantly. B

  2. Click here

    PERFORM ACTIVE TEST USING GTS (SKID CONTROL BUZZER ASSEMBLY)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the Active Test on the GTS (Click here).

      Table 2. ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      DSS Signal Buzzer Skid control buzzer assembly Buzzer ON/OFF Buzzer can be heard

    4. Check that the buzzer sounds/stops when turning the skid control buzzer assembly on/off using the GTS.

      Result
      Result Proceed to
      Buzzer does not sound. A
      Buzzer sounds/stops. B
      Tip:

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (Click here).


  3. Click here

    CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    1. A00045RE02

      Turn the power switch off.

    2. Disconnect the H65 skid control buzzer assembly connector.

    3. Turn the power switch on (IG).

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      H65-2 (IG1) - Body ground Power switch on (IG) 11 to 14 V
      Table 3. Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control Buzzer Assembly)

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

  4. Click here

    INSPECT SKID CONTROL BUZZER ASSEMBLY


    1. A0007R0E29

      Turn the power switch off.

    2. Connect a negative (-) lead from the auxiliary battery to terminal 1 (BZ), and a positive (+) lead to terminal 2 (IG1) of the skid control buzzer assembly, and then check that the buzzer sounds.

      OK
      The skid control buzzer assembly sounds.
      Table 4. Text in Illustration
      *a

      Component without harness connected

      (Skid Control Buzzer Assembly)

  5. Click here

    CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - SKID CONTROL BUZZER ASSEMBLY)


    1. Disconnect the A24 skid control ECU (brake booster with master cylinder assembly) connector 2 minutes after the power switch is turned off.

      Tip:

      Do not open/close the driver door within 2 minutes after the power switch is turned off.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A24-13 (BZ) - H65-1 (BZ) Always Below 1 Ω
      A24-13 (BZ) - Body ground Always 10 kΩ or higher

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. Click here

    CHECK HARNESS AND CONNECTOR (GND TERMINAL)


    1. A0006UCE01

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A24-28 (GND) - Body ground Always Below 1 Ω
      A24-27 (GND2) - Body ground Always Below 1 Ω
      A24-26 (GND3) - Body ground Always Below 1 Ω
      A24-25 (GND4) - Body ground Always Below 1 Ω
      A24-24 (GND5) - Body ground Always Below 1 Ω
      A24-23 (GND6) - Body ground Always Below 1 Ω
      Table 5. Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))
      Tip:

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


    • OK

      REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

  7. Click here

    INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY


    1. Disconnect the A24 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Check the skid control buzzer assembly operation.

      Result
      Result Proceed to
      Buzzer stops. A
      Buzzer sounds constantly. B
      Tip:

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


  8. Click here

    REPLACE SKID CONTROL BUZZER ASSEMBLY


    1. Reconnect the A24 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Replace the skid control buzzer assembly (Click here).

    3. Check the skid control buzzer assembly operation.

      Result
      Result Proceed to
      Buzzer stops. A
      Buzzer sounds constantly. B

  9. Click here

    CHECK IF CONNECTOR IS SECURELY CONNECTED


    1. Gently jiggle the connectors and wire harnesses and check the skid control buzzer assembly operation.

      Result
      Result Proceed to
      Buzzer stops. A
      Buzzer sounds constantly. B

    • A

      END

    • B

      REPAIR OR REPLACE HARNESS OR CONNECTOR