Skid Control Buzzer Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Select the Active Test on the Techstream, refer to DATA LIST / ACTIVE TEST .
   ABS/VSC/TRAC
   
   

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

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

   Result

   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 suspected area, refer to PROBLEM SYMPTOMS TABLE .

B → END 

A: Go to next step 

1. Turn the ignition switch off.
   Fig 1: Identifying Skid Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A44-13 (VBZ) - Body ground	Ignition switch ON	9.1 to 15 V

   TEXT IN ILLUSTRATION
   
   

   *1	Component with harness connected (Skid Control ECU)

NG → See step   6 

OK: Go to next step 

1. Turn the ignition switch off.
   Fig 2: Inspecting Skid Control Buzzer

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the skid control buzzer connector.
3. Apply battery negative voltage to terminal 1 (BZ) and battery positive voltage to terminal 2 (VBZ) of the skid control buzzer, and then check that the buzzer sounds.

   OK

   The skid control buzzer sounds.

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Skid Control Buzzer)

NG → See step   7 

OK: Go to next step 

1. Disconnect the A44 skid control ECU connector.
   Fig 3: Identifying Skid Control ECU Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A44-12 (BZ) - A16-1 (BZ)	Always	Below 1 Ω
   A44-12 (BZ) - Body ground	Always	10 kΩ or higher
   A44-13 (VBZ) - A16-2 (VBZ)	Always	Below 1 Ω
   A44-13 (VBZ) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the A45, A46 and A47 skid control ECU connectors.
   Fig 4: Identifying Skid Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1

   Front view of wire harness connector (to Skid Control ECU)

   -

   -

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A46-1 (GND) - Body ground	Always	Below 1 Ω
   A44-3 (GND2) - Body ground	Always	Below 1 Ω
   A44-1 (GND3) - Body ground	Always	Below 1 Ω
   A47-3 (GND4) - Body ground	Always	Below 1 Ω
   A47-1 (GND5) - Body ground	Always	Below 1 Ω
   A45-3 (GND6) - Body ground	Always	Below 1 Ω

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next suspected area before replacing the part, refer to PROBLEM SYMPTOMS TABLE .

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) 

OK → See step   6