Inspection Procedure

1. Connect Techstream to the DLC3.
2. Start the engine.
3. Select the Active Test mode on Techstream (See DATA LIST/ACTIVE TEST  ).

   ABS / VSC / TRAC: 

   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 by using Techstream.

   Result 

   RESULT REFERENCE TABLE
   
   

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

   HINT:

   If troubleshooting has been carried out according to the 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 

1. Turn the ignition switch off.
2. Disconnect the skid control buzzer connector.
3. Turn the ignition switch on (IG).
4. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   VOLTAGE SPECIFICATION TABLE
   
   

   Tester Connection	Switch Condition	Specified Condition
   A16-2 - Body ground	Ignition switch on (IG)	11 to 14 V

   Fig 1: Identifying A16 Skid Control Buzzer Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

OK: Go to next step 

1. Turn the ignition switch off.
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. 

   Fig 2: Applying Battery Voltage To Skid Control Buzzer Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SKID CONTROL BUZZER  (See REMOVAL  )

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 

   RESISTANCE SPECIFICATION TABLE
   
   

   Tester Connection	Condition	Specified Condition
   A24-21 (BZ) - A16-1	Always	Below 1 Ω
   A24-21 (BZ) - Body ground	Always	10 kΩ or higher

   HINT:

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

   Fig 3: Identifying A24 Skid Control ECU & A16 Skid Control Buzzer Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE BRAKE ACTUATOR ASSEMBLY  (See REMOVAL  )