Inspection Procedure

1. Select the ACTIVE TEST, generate a control command, and then check that the skid control buzzer operates.

   ABS / VSC / TRAC: 

   SKID CONTROL ECU DIAGNOSTIC CHART
   
   

   Item	Test Details	Diagnostic Note
   VSC/BR WARN BUZ	Turns VSC / BRAKE warning buzzer ON / OFF	Buzzer can be heard

   OK: 

   The skid control buzzer can be heard. 

OK: REPLACE SKID CONTROL ECU 

NG: Go to next step 

1. Disconnect the skid control buzzer connector.
2. Apply a battery negative voltage to terminal 1 and positive voltage to terminal 2 of the skid control buzzer connector, and check that the buzzer sounds.

   OK: 

   The skid control buzzer sound should be heard. 

NG: REPLACE SKID CONTROL BUZZER ASSEMBLY 

Fig 1: Inspecting Skid Control Buzzer Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Disconnect the S8 ECU connector.
2. Disconnect the S6 buzzer connectors.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   STANDARD RESISTANCE REFERENCE CHART
   
   

   Tester Connection	Specified Condition
   S8-33 (VBZ) - S6-2 (VBZ)	Below 1 Ω
   S8-12 (BZ) - S6-1 (BZ)	Below 1 Ω
   S8-33 (VBZ) - Body ground	10 kΩ or higher
   S8-12 (BZ) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 2: Disconnecting S8 ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Measure the resistance of the connectors.

   Standard resistance 

   STANDARD RESISTANCE REFERENCE CHART
   
   

   Tester Connection	Specified Condition
   S7-1 (GND) - Body ground	Below 1 Ω
   S8-2 (GND2) - Body ground	Below 1 Ω
   S8-1 (GND3) - Body ground	Below 1 Ω
   S9-2 (GND4) - Body ground	Below 1 Ω
   S9-1 (GND5) - Body ground	Below 1 Ω
   S10-4 (GND6) - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 3: Identifying Skid Control ECU - Body Ground

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE SKID CONTROL ECU ASSEMBLY