ELECTRONICALLY CONTROLLED BRAKE SYSTEM > Skid Control Buzzer Circuit

for Preparation Click here


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 system).

WIRING DIAGRAM


C209400E07


INSPECTION PROCEDURE

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

1.CHECK BUZZER OPERATION

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

    Result:

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



B
Go to step 7
A


2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SKID CONTROL BUZZER)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Select the Active Test on the intelligent tester (Click here).

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

  1. Check that the buzzer sounds/stops when turning the skid control buzzer on/off using the intelligent tester.

    Result:

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

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



B
CHECK FOR INTERMITTENT PROBLEMS (Click here)
A


3.INSPECT SKID CONTROL BUZZER (POWER SOURCE TERMINAL)


    C181786E17

  1. Turn the power switch off.

  1. Disconnect the skid control buzzer connector.

  1. Turn the power switch on (IG).

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H24-2 (IG1) - Body ground
    		Power switch on (IG)
    		11 to 14 V

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Skid Control Buzzer)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK


4.INSPECT SKID CONTROL BUZZER
C181788E13

  1. Turn the power switch off.

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

    OK:
    The skid control buzzer sounds.

    Text in Illustration 
    *a
    		Component without harness connected
    (Skid Control Buzzer)

    Result:

    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C



B
REPLACE SKID CONTROL BUZZER (Click here)

C
REPLACE SKID CONTROL BUZZER (Click here)
A


5.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SKID CONTROL BUZZER)

  1. Disconnect the skid control ECU connector 2 minutes after the power switch is turned off.

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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A61-13 (BZ) - H24-1 (BZ)
    		Always
    		Below 1 Ω
    A61-13 (BZ) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.INSPECT SKID CONTROL ECU (GND TERMINAL)


    C209401E60

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A61-28 (GND) - Body ground
    		Always
    		Below 1 Ω
    A61-27 (GND2) - Body ground
    		Always
    		Below 1 Ω
    A61-26 (GND3) - Body ground
    		Always
    		Below 1 Ω
    A61-25 (GND4) - Body ground
    		Always
    		Below 1 Ω
    A61-24 (GND5) - Body ground
    		Always
    		Below 1 Ω
    A61-23 (GND6) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Skid Control ECU)

    Result:

    Result
    		Proceed to
    OK (for LHD)
    		A
    OK (for RHD)
    		B
    NG
    		C

    HINT:
    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).



B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)

C
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)  

7.INSPECT SKID CONTROL ECU

  1. Disconnect the skid control ECU connector.

  1. Check that the skid control buzzer operation.

    Result:

    Result
    		Proceed to
    Buzzer stops (for LHD)
    		A
    Buzzer stops (for RHD)
    		B
    Buzzer sounds constantly
    		C

    HINT:
    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).



B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)

C
Go to step 8
A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)  

8.REPLACE SKID CONTROL BUZZER

  1. Reconnect the skid control ECU connector.

  1. Replace the skid control buzzer (Click here for LHD or Click here for RHD).

  1. Check that the skid control buzzer operation.

    Result:

    Result
    		Proceed to
    Buzzer stops
    		A
    Buzzer sounds constantly
    		B

    HINT:
    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).



B
Go to step 9
A

END 

9.CHECK IF CONNECTOR IS SECURELY CONNECTED

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

    Result:

    Result
    		Proceed to
    Buzzer stops
    		A
    Buzzer sounds constantly
    		B

    HINT:
    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).



B
REPAIR OR REPLACE HARNESS OR CONNECTOR
A

END