Skid Control Buzzer Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test.
5. Select the Active Test on the Techstream.
   ABS/VSC/TRAC
   
   

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

6. Check that the buzzer sounds/stops when turning the skid control buzzer on/off by 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 step. Refer to PROBLEM SYMPTOMS TABLE .

B → END 

A: Go to next step 

1. Turn the ignition switch off.
   Fig 1: Skid Control Buzzer Assembly Connector End View

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A21-2 - Body ground	Ignition switch ON	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: Go to next step 

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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

   The skid control buzzer sounds.

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Skid Control Buzzer)

NG → See step   6 

OK: Go to next step 

1. Disconnect the skid control ECU connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A4-21 (BZ) - A51-1	Always	Below 1 Ω
   A4-21 (BZ) - Body ground	Always	10 kΩ or higher

   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. Refer to PROBLEM SYMPTOMS TABLE .

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   5