TRAC OFF Indicator Light Remains ON

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: TRAC OFF Indicator Light Remains ON
- TRAC OFF Indicator Light Remains ON

DESCRIPTION

The skid control ECU is connected to the combination meter via CAN communication.

Pressing the VSC OFF switch turns off traction control and pressing and holding this switch turns off traction and VSC controls. If TRAC control is turned off, the TRAC OFF indicator light will come on.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration Programming and Relearning.

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

(a) Check if a CAN communication system DTC is output Diagnosis System.

Result:





B -- INSPECT CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

2. CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

(a) Check if the skid control ECU connector is securely connected.

OK:

The connector is securely connected.

NG -- CONNECT CONNECTOR TO ECU CORRECTLY
OK -- Continue to next step.

3. CHECK BATTERY

(a) Check the battery voltage.

Standard voltage:

11 to 14 V

Result:





C -- CHECK OR REPLACE CHARGING SYSTEM OR BATTERY (for 1AR-FE) Component Tests and General Diagnostics

B -- CHECK OR REPLACE CHARGING SYSTEM OR BATTERY (for 2GR-FE) Component Tests and General Diagnostics
A -- Continue to next step.

4. READ VALUE ON TECHSTREAM (VSC OFF SWITCH)

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch on (IG).

(c) Select the Data List mode on Techstream Data List / Active Test.

ABS / VSC / TRAC:





(d) Using Techstream, check the switch condition on Techstream changes according to VSC OFF switch operation.

OK:

The Techstream display changes according to VSC OFF switch operation.

NG -- INSPECT VSC OFF SWITCH
OK -- Continue to next step.

5. INSPECT COMBINATION METER ASSEMBLY

(a) Turn the ignition switch off.

(b) Perform the Active Test of the combination meter (meter CPU) using Techstream Meter / Gauge System.

(c) Check the combination meter.

OK:

The TRAC OFF indicator light turns on or off in accordance with Techstream operation.

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 Problem Symptoms Table.

NG -- REPLACE COMBINATION METER ASSEMBLY Removal

OK -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal

6. INSPECT VSC OFF SWITCH

(a) Turn the ignition switch off.





(b) Disconnect the VSC OFF switch connector.

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

Standard resistance:





NG -- REPLACE VSC OFF SWITCH Removal
OK -- Continue to next step.

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

(a) Disconnect the skid control ECU connector.





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

Standard resistance:





HINT
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal