Skid Control Buzzer Circuit: Wiring Diagram

WARNING: This page is about a different car, the 2006 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE: When replacing the skid control ECU, perform zero point calibration (See CALIBRATION ).

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (SKID CONTROL BUZZER)

Connect the intelligent tester to the DLC3.
Start the engine.

Select the Active Test mode on the intelligent tester.

ABS / VSC:

VEHICLE CONDITION

Item (Display)	Vehicle Condition / Test Details	Diagnostic Note
BUZZER	Turns skid control buzzer ON / OFF	Buzzer can be heard

Check that the buzzer sounds/stops when turning the skid control buzzer on/off by using the intelligent tester.

Result

CONDITION CHART

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

HINT:

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

B : END

A : GO TO NEXT STEP

INSPECT SKID CONTROL BUZZER (POWER SOURCE TERMINAL)

Turn the engine switch off.
Disconnect the skid control buzzer connector.
Turn the engine switch on (IG).

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

Standard voltage

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
J18-2 - Body ground	Engine switch on (IG)	10 to 14 V

Fig 2: Inspecting Skid Control Buzzer (Power Source Terminal)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

OK : GO TO NEXT STEP

INSPECT SKID CONTROL BUZZER
1. Apply battery negative voltage to terminal 1, and battery positive voltage to terminal 2 of the skid control buzzer, and then check that the buzzer sounds.
  OK: Skid control buzzer sounds.
  
  Fig 3: Inspecting Skid Control Buzzer
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG : REPLACE SKID CONTROL BUZZER

OK : GO TO NEXT STEP

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SKID CONTROL BUZZER)

Turn the engine switch off.
Disconnect the skid control ECU connector.

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

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
J77-11 (BZ) - J18-1	Always	Below 1 Ω
J77-11 (BZ) - Body ground	Always	10 kΩ or higher

HINT:

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

Fig 4: Checking Harness And Connector (Skid Control ECU - Skid Control Buzzer)

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : REPLACE SKID CONTROL ECU