Skid Control Buzzer Circuit [10/2014 - 10/2015]: 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

Result: 

B 

See step  7

Result: 

A 

See step  2

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 [10/2014 - 10/2015] ).
   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 [10/2014 - 10/2015] ).

Result: 

B 

USE SIMULATION METHOD TO CHECK 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] )

Result: 

A 

See step  3

1. Turn the power switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the D10 skid control buzzer assembly 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	Condition	Specified Condition
   D10-2 (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 Assembly)

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

Result: 

OK 

See step  4

1. Turn the power switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Connect a negative (-) lead from the auxiliary 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)

Result: 

NG 

REPLACE SKID CONTROL BUZZER ASSEMBLY 

(Refer to REMOVAL [10/2014 - 10/2015] )

Result: 

OK 

See step  5

1. Disconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector 2 minutes after the power switch is turned off.

   HINT: 

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

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A51-13 (BZ) - D10-1 (BZ)	Always	Below 1 Ω
   A51-13 (BZ) - Body ground	Always	10 kΩ or higher
   D10-1 (BZ) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

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
   A51-28 (GND) - Body ground	Always	Below 1 Ω
   A51-27 (GND2) - Body ground	Always	Below 1 Ω
   A51-26 (GND3) - Body ground	Always	Below 1 Ω
   A51-25 (GND4) - Body ground	Always	Below 1 Ω
   A51-24 (GND5) - Body ground	Always	Below 1 Ω
   A51-23 (GND6) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder 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 parts (Refer to PROBLEM SYMPTOMS TABLE [10/2014 - 10/2015] ).

Result: 

OK 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) 

1. Disconnect the A51 skid control ECU (brake booster with master cylinder 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 parts (Refer to PROBLEM SYMPTOMS TABLE [10/2014 - 10/2015] ).

Result: 

A 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

B 

See step  8

1. Reconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.
2. Replace the skid control buzzer assembly (Refer to REMOVAL [10/2014 - 10/2015] ).
3. Check the skid control buzzer assembly operation.

   Result

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

Result: 

A 

END 

Result: 

B 

See step  9

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

Result: 

A 

END 

Result: 

B 

REPAIR OR REPLACE HARNESS OR CONNECTOR