Skid Control Buzzer Circuit: Procedure

1. Using the Techstream Active Test, generate a control command and then check that the skid control buzzer operates.
   ABS/VSC/TRAC
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   VSC H/B Warning Buzzer	Turn skid control buzzer ON / OFF	Buzzer can be heard	-

   OK

   Skid control buzzer can be heard.

OK → REPLACE SKID CONTROL ECU 

NG: Go to next step 

Fig 1: Identifying Skid Control Buzzer

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the skid control buzzer connector.
2. Apply battery voltage to terminals 1 and 2 of the skid control buzzer connector, and then check that the buzzer sounds.

   OK

   Buzzer sound can be heard.

NG → REPLACE SKID CONTROL BUZZER 

OK: Go to next step 

Fig 2: Identifying V8 And S7 Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the V8 buzzer connector.
2. Disconnect the S7 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance

   Tester Connection	Specified Condition
   S7-2 (BZ) - V8-1	Below 1 Ω
   S7-2 (BZ) - Body ground	10 kΩ or higher

4. Turn the ignition switch ON.
5. Measure the voltage of the wire harness side connectors.

   Standard voltage

   Tester Connection	Specified Condition
   V8-2 - Body ground	10 to 14 V

NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK → REPLACE SKID CONTROL ECU