Skid Control Buzzer Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream main switch on.
3. Select Active Test mode on the Techstream.
   ABS/VSC/TRAC
   
   

   Tester Display	Vehicle Condition / Test Details	Control Range	Diagnostic Note
   Buzzer	Turns 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 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 the "PROBLEM SYMPTOMS TABLE", refer back to the table and proceed to the next step. Refer to PROBLEM SYMPTOMS TABLE [09/2012 - ] .

B → See step   6 

A: Go to next step 

1. Disconnect the L2 buzzer connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Turn the engine switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   L2-2 - Body ground	Engine 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.

   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

   Skid control buzzer sounds.

NG → See step   8 

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

   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

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

   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. Refer to PROBLEM SYMPTOMS TABLE [09/2012 - ] .

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

OK → See step   7