Skid Control Buzzer Circuit: Procedure

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test.
   ABS/VSC/TRAC
   
   

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

6. Check that the skid control buzzer sounds/stops when turning the skid control buzzer on/off by using the Techstream.
   RESULT
   
   

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

B → See step   6 

A: Go to next step 

1. Turn the engine switch off.
2. Disconnect the skid control buzzer connector.
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   N1-2 - Body ground	Engine 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 

OK: Go to next step 

1. Remove the skid7 control buzzer. Refer to REMOVAL [12/2011 - ] .
2. Apply battery voltage to the skid control buzzer, and check that the buzzer sounds.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   Measurement Condition	Specified Condition
   Battery positive (+) voltage - Terminal 2	Skid control buzzer sounds
   Battery negative (-) voltage - Terminal 1

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Skid Control Buzzer)

NG → See step   7 

OK: Go to next step 

1. Turn the engine switch off.
2. Disconnect the A13 skid control ECU (brake actuator assembly) connector.
3. Disconnect the N1 skid control buzzer connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A13-21 (BZ) - N1-1	Always	Below 1 Ω
   A13-21 (BZ) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   5