Vehicle Stability Control System (For Sedan) Trac Off Indicator Light Does Not Come On

Brake. Yaris. Ncp93, 131
Brake Control Dynamic Control Systems. Yaris. Ncp93, 131

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

READ VALUE USING TECHSTREAM (VSC OFF SWITCH)

REPLACE COMBINATION METER ASSEMBLY

CHECK THAT TRAC OFF INDICATOR IS ILLUMINATED

INSPECT VSC OFF SWITCH

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - VSC OFF SWITCH)

VEHICLE STABILITY CONTROL SYSTEM (for Sedan) - TRAC OFF Indicator Light does not Come ON


WIRING DIAGRAM

Refer to TRAC OFF Indicator Light Remains ON (YARIS_NCP93 RM000001FQO0AFX_02.html).

INSPECTION PROCEDURE

NOTICE:
  1. When replacing the brake actuator assembly, perform zero point calibration (YARIS_NCP93 RM000000XHR06QX.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK CAN COMMUNICATION SYSTEM

  1. Check if a CAN communication system DTC is output (YARIS_NCP93 RM000001D3E00OX.html).

    Result
    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output
    		B


B
INSPECT CAN COMMUNICATION SYSTEM (YARIS_NCP93 RM000001D3500JX.html)
A


2.READ VALUE USING TECHSTREAM (VSC OFF SWITCH)

  1. Connect the Techstream to the DLC3.

  1. Turn the engine switch to ON.

  1. Select the Data List on the Techstream (YARIS_NCP93 RM000000XHW09EX.html).

    ABS/VSC/TRAC
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    TRAC/VSC Off Mode
    		TRAC/VSC off mode / Normal, TRAC OFF or VSC OFF
    		Normal: Normal mode
    TRAC OFF: TRAC OFF mode
    VSC OFF: VSC OFF mode
    		-

  1. Using the Techstream, check the switch condition on the Techstream changes according to VSC OFF switch operation.

    OK:
    The Techstream display changes according to VSC OFF switch operation.


NG
Go to step 6
OK


3.REPLACE COMBINATION METER ASSEMBLY

  1. Turn the ignition switch off.

  1. Replace the combination meter (YARIS_NCP93 RM000000IN001JX.html).


NEXT


4.CHECK THAT TRAC OFF INDICATOR IS ILLUMINATED

  1. Check if the TRAC OFF indicator is illuminated when the ignition switch is turned to ON.

    OK:
    TRAC OFF indicator should be illuminated.
    HINT:
    When the ignition switch is turned to ON, TRAC OFF indicator lights come on for approximately 3 seconds. This signal comes from the skid control ECU via CAN communication.


NG
REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02FX.html)
OK

END

5.INSPECT VSC OFF SWITCH


    Yaris. Ncp93, 131.Brake Control Dynamic Control Systems.Anti-Lock Brake System (For Sedan).Vehicle Stability Control System (For Sedan) Trac Off Indicator Light Does Not Come On

  1. Turn the engine switch off.

  1. Disconnect the VSC OFF switch connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    6 (E) - 9 (+)
    		Switch is pushed in
    		Below 1 Ω
    6 (E) - 9 (+)
    		Switch is not pushed in
    		10 kΩ or higher
    Text in Illustration
    *1
    		Component without harness connected
    (VSC OFF Switch)


NG
REPLACE VSC OFF SWITCH (YARIS_NCP93 RM000002VOX013X.html)
OK


6.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - VSC OFF SWITCH)

  1. Connect the skid control ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A30-30 (CSW) - D82-9 (+)
    		Always
    		Below 1 Ω
    A30-30 (CSW) - Body ground
    		Always
    		10 kΩ or higher
    D82-6 (E) - Body ground
    		Always
    		Below 1 Ω
    HINT:
    If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (YARIS_NCP93 RM000000XHN0AXX.html).


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (YARIS_NCP93 RM000000XHS09YX.html)