Vehicle Stability Control System (For Sedan) Trac Off Indicator Light Remains On

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

INSPECT BATTERY

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)

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

When replacing the brake actuator assembly, perform zero point calibration and store system information (YARIS_NCP93 RM000000XHR06QX.html).

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

1. Check if the skid control ECU connector is securely connected.
   

   OK:

   The connector is securely connected.
   

1. Check the battery voltage.
   

   Standard voltage:

   11 to 14 V
   

1. Connect the Techstream to the DLC3.
   

2. Turn the engine switch to ON.
   

3. 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	-

4. 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.
   

1. Turn the ignition switch off.
   

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

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.

1. Turn the ignition switch off.
   

2. Disconnect the VSC OFF switch connector.
   

3. 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)

1. Connect the skid control ECU connector.
   

2. 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).