Skid Control Buzzer Circuit: Procedure

1. Confirm problem symptoms of the skid control buzzer according to the customer problem analysis.

   Result

   Result	Proceed to
   Buzzer does not sound	A
   Buzzer sounds constantly	B

B → See step   7 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Select the Active Test on the Techstream. Refer to DATA LIST / ACTIVE TEST .
   ABS/VSC/TRAC
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   DSS Signal 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 using the Techstream.

   Result

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

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step. Refer to PROBLEM SYMPTOMS TABLE .

B → See step   11 

A: Go to next step 

1. Turn the power switch off.
   Fig 1: Inspecting L46 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the skid control buzzer connector.
3. Turn the power switch on (IG).
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   L46-2 (IG1) - Body ground	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Skid Control Buzzer)

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

OK: Go to next step 

1. Turn the power switch off.
   Fig 2: Checking Skid Control Buzzer

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect a negative (-) lead from the battery to terminal 1, and a positive (+) lead to terminal 2 of the skid control buzzer, and then check that the buzzer sounds.

   OK

   The skid control buzzer sounds.

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Skid Control Buzzer)

NG → See step   12 

OK: Go to next step 

1. Disconnect the skid control ECU connector 2 minutes after the power switch is turned off.
   Fig 3: Checking A58 & L46 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT: 

   Do not open/close the driver door within 2 minutes after the power switch is turned off.

2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A58-13 (BZ) - L46-1 (BZ)	Always	Below 1 Ω
   A58-13 (BZ) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Skid Control ECU)
   *b	Front view of wire harness connector (to Skid Control Buzzer)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 4: Inspecting A58 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A58-28 (GND) - Body ground	Always	Below 1 Ω
   A58-27 (GND2) - Body ground	Always	Below 1 Ω
   A58-26 (GND3) - Body ground	Always	Below 1 Ω
   A58-25 (GND4) - Body ground	Always	Below 1 Ω
   A58-24 (GND5) - Body ground	Always	Below 1 Ω
   A58-23 (GND6) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Skid Control ECU)

   HINT: 

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

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

OK → See step   10 

1. Disconnect the skid control ECU connector.
2. Check that the skid control buzzer operation.

   Result

   Result	Proceed to
   Buzzer stops	A
   Buzzer sounds constantly	B

   HINT: 

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

B → See step   8 

A → See step   10 

1. Reconnect the skid control ECU connector.
2. Replace the skid control buzzer. Refer to REMOVAL .
3. Check that the skid control buzzer operation.

   Result

   Result	Proceed to
   Buzzer stops	A
   Buzzer sounds constantly	B

   HINT: 

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

B → See step   9 

A → END 

1. Gently jiggle the connectors and wire harnesses and check the skid control buzzer operation.

   Result

   Result	Proceed to
   Buzzer stops	A
   Buzzer sounds constantly	B

   HINT: 

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

B → REPAIR OR REPLACE HARNESS OR CONNECTOR 

A → END