Inspection Procedure

PERFORM ACTIVE TEST USING TECHSTREAM (SKID CONTROL BUZZER)

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.

Select the Active Test on the Techstream (See DATA LIST / ACTIVE TEST ).

ABS/VSC/TRAC

ABS/VSC/TRAC ACTIVE TEST REFERENCE

Tester Display	Test Part	Control Range	Diagnostic Note
Buzzer	Skid control buzzer	Buzzer ON/OFF	Buzzer can be heard

Check that the buzzer sounds/stops when turning the skid control buzzer on/off using the Techstream.

Result

RESULT CHART

Result	Proceed to
Buzzer does not sound or sounds constantly	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 (See PROBLEM SYMPTOMS TABLE ).

B: END

A: Go to next step

INSPECT SKID CONTROL BUZZER (POWER SOURCE TERMINAL)

Turn the ignition switch off.
Disconnect the skid control buzzer connector.
Turn the ignition switch to ON.

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

Standard Voltage

VOLTAGE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
A20-2 (IG1) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

ILLUSTRATION LEGEND

*1	Front view of wire harness connector (to Skid Control Buzzer)

Fig 1: Identifying Skid Control Buzzer Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

OK: Go to next step

INSPECT SKID CONTROL BUZZER

Turn the ignition switch off.

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:

The skid control buzzer sounds .

Text in Illustration

ILLUSTRATION LEGEND

*1	Component without harness connected (Skid Control Buzzer)

Fig 2: Inspecting Skid Control Buzzer

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SKID CONTROL BUZZER (See REMOVAL )

OK: Go to next step

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

Disconnect the skid control ECU connector.

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

Standard Resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
A42-42 (BZ) - A20-1 (BZ)	Always	Below 1 Ω
A42-42 (BZ) - Body ground	Always	10 kΩ or higher

Text in Illustration

ILLUSTRATION LEGEND

*1	Front view of wire harness connector (to Brake Actuator (Skid Control ECU)
*2	Front view of wire harness connector (to Skid Control Buzzer)

Fig 3: Identifying Skid Control ECU Connector And Skid Control Buzzer Connector

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 (See PROBLEM SYMPTOMS TABLE ).

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE BRAKE ACTUATOR ASSEMBLY (See REMOVAL )