Skid Control Buzzer Circuit: Procedure

1. Confirm problem symptoms of the skid control buzzer assembly 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 engine switch on (IG).
3. Select the Active Test on the Techstream. Refer to DATA LIST / ACTIVE TEST [06/2012 - ] .
   ABS/VSC/TRAC
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   DSS Signal Buzzer	Skid control buzzer assembly	Buzzer ON/OFF	Buzzer can be heard

4. Check that the buzzer sounds/stops when turning the skid control buzzer assembly 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 [06/2012 - ] .

B → See step   12 

A: Go to next step 

1. Turn the engine switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the H65 skid control buzzer assembly connector.
3. Turn the engine switch on (IG).
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   H65-2 (IG1) - Body ground	Engine switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

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

OK: Go to next step 

1. Turn the engine switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Connect a negative (-) lead from the battery to terminal 1 (BZ), and a positive (+) lead to terminal 2 (IG1) of the skid control buzzer assembly, and then check that the buzzer sounds.

   OK

   The skid control buzzer assembly sounds.

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Skid Control Buzzer Assembly)

NG → See step   11 

OK: Go to next step 

1. Disconnect the A40 skid control ECU (brake actuator assembly) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A40-21 (BZ) - H65-1 (BZ)	Always	Below 1 Ω
   A40-21 (BZ) - Body ground	Always	10 kΩ or higher

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.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A40-1 (GND1) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

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

   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 [06/2012 - ] .

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT) 

OK → See step   10 

1. Disconnect the A40 skid control ECU (brake actuator assembly) connector.
2. Check the skid control buzzer assembly 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 [06/2012 - ] .

B → See step   8 

A → See step   10 

1. Reconnect the A40 skid control ECU (brake actuator assembly) connector.
2. Replace the skid control buzzer assembly. Refer to REMOVAL [06/2012 - ] .
3. Check the skid control buzzer assembly operation.

   Result

   Result	Proceed to
   Buzzer stops.	A
   Buzzer sounds constantly.	B

B → See step   9 

A → END 

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

   Result

   Result	Proceed to
   Buzzer stops.	A
   Buzzer sounds constantly.	B

B → REPAIR OR REPLACE HARNESS OR CONNECTOR 

A → END