Inspection Procedure

1. Connect the Intelligent tester or Techstream to the DLC3.
2. Turn the power switch ON (IG) and turn the Intelligent tester or Techstream main switch on.
3. Select ACTIVE TEST mode on the Intelligent tester or Techstream.
   1. Intelligent tester

      ABS/VSC: 

      ABS/VSC REFERENCE
      
      

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

   2. Techstream

      ABS/VSC/TRAC: 

      ABS/VSC/TRAC REFERENCE
      
      

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

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

   Result 

   RESULT REFERENCE
   
   

   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 before replacing the part (see PROBLEM SYMPTOMS TABLE  ).

B: REPLACE SKID CONTROL ECU  (See REMOVAL  )

A: Go to next step 

Fig 1: Identifying L2 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the L2 buzzer connector.
2. Turn the power switch ON (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   L2-2 - Body ground	Power switch ON (IG)	11 to 14 V

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

OK: Go to next step 

1. Disconnect the skid control buzzer connector.
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: Skid control buzzer sounds. 

   Fig 2: Inspecting Skid Control Buzzer Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SKID CONTROL BUZZER ASSEMBLY  (See REMOVAL  )

OK: Go to next step 

1. Disconnect the A19 ECU connector.
2. Disconnect the L2 buzzer connector.
3. Measure the resistance according to the value(s) in the table below

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   A19-22 (BZ) - L2-1	Always	Below 1 Ω
   A19-22 (BZ) - Body ground	Always	10 kΩ or higher
   A19-41 (VBZ) - L2-2	Always	Below 1 Ω
   A19-41 (VBZ) - Body ground	Always	10 kΩ or higher

   Fig 3: Identifying A19 And L2 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the A19 and A21 ECU connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   A19-1 (GND) - Body ground	Always	Below 1 Ω
   A21-1 (GND4) - Body ground	Always	Below 1 Ω

   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 4: Identifying A19 And A21 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE SKID CONTROL ECU  (See REMOVAL  )