VEHICLE STABILITY CONTROL SYSTEM TRC OFF Indicator Light Remains ON

DESCRIPTION

The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.

Pressing the VSC OFF switch turns off TRC, and pressing and holding this switch turns off TRC and VSC. If TRC control is turned off, the TRC OFF indicator light illuminates in the combination meter assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Check if CAN communication system DTCs are output.

      Click here

      Result
      Result Proceed to DTCs are not output. A DTCs are output. B

   
   

   B

   INSPECT CAN COMMUNICATION SYSTEM Click here

   A

2. CHECK IF BRAKE ACTUATOR ASSEMBLY CONNECTOR IS SECURELY CONNECTED

   
   

   1. Check if the skid control ECU (brake actuator assembly) connector is securely connected.

      OK
      The connector is securely connected.

      Result
      Proceed to OK NG

   
   

   NG

   CONNECT CONNECTOR TO ACTUATOR CORRECTLY

   OK

3. CHECK BATTERY

   
   

   1. Check the battery voltage.

      Standard Voltage
      11 to 14 V

      Result
      Proceed to OK NG

   
   

   NG

   CHECK OR REPLACE CHARGING SYSTEM COMPONENT OR BATTERY for 1AD-FTV: Click here CHECK OR REPLACE CHARGING SYSTEM COMPONENT OR BATTERY for 1ND-TV: Click here CHECK OR REPLACE CHARGING SYSTEM COMPONENT OR BATTERY for 1NR-FE: Click here CHECK OR REPLACE CHARGING SYSTEM COMPONENT OR BATTERY for 1ZR-FAE: Click here CHECK OR REPLACE CHARGING SYSTEM COMPONENT OR BATTERY for 1ZR-FE: Click here CHECK OR REPLACE CHARGING SYSTEM COMPONENT OR BATTERY for 2ZR-FE: Click here

   OK

4. READ VALUE USING GTS (VSC OFF SWITCH)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Select the Data List using the GTS.

      Click here

      
      Chassis > ABS/VSC/TRC > Data List

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

      
      Chassis > ABS/VSC/TRC > Data List

      Tester Display
      TRC/VSC Off Mode

   4. Using the GTS, check that the switch condition displayed on the GTS changes according to VSC OFF switch operation.

      OK
      The GTS display changes according to VSC OFF switch operation.

      Result
      Proceed to OK NG

   
   

   NG

   INSPECT VSC OFF SWITCH Click here

   OK

5. INSPECT COMBINATION METER ASSEMBLY

   
   

   1. Turn the ignition switch off.

   2. Perform an Active Test of the combination meter assembly using the GTS.

      Click here

      
      Body Electrical > Combination Meter > Active Test

      Tester Display
      VSC TRC Indicator

   3. Check the combination meter assembly.

      OK
      The TRC OFF indicator light turns on or off in accordance with the Active Test operation.

      Tech Tips

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

      Click here

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE BRAKE ACTUATOR ASSEMBLY Click here

   NG

   INSPECT METER / GAUGE SYSTEM Click here

6. INSPECT VSC OFF SWITCH

   
   

   1. Turn the ignition switch off.

   2. Inspect the VSC OFF switch.

      for LHD: Click here

      for RHD: Click here

      OK
      The VSC OFF switch is normal.

      Result
      Result Proceed to OK A NG (for LHD) B NG (for RHD) C

   
   

   B

   REPLACE VSC OFF SWITCH Click here

   C

   REPLACE VSC OFF SWITCH Click here

   A

7. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - VSC OFF SWITCH)

   
   

   1. Disconnect the A97 skid control ECU (brake actuator assembly) connector.

   2. Disconnect the E47 VSC OFF switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition A97-9 (CSW) - E47-6 (+) Always Below 1 Ω A97-9 (CSW) or E47-6 (+) - Body ground Always 10 kΩ or higher E47-3 (E) - Body ground Always Below 1 Ω

      Tech Tips

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

      Click here

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE BRAKE ACTUATOR ASSEMBLY Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR