ELECTRONICALLY CONTROLLED BRAKE SYSTEM VSC OFF Indicator Light Remains ON

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) is connected to the combination meter assembly via CAN communication.

Pressing the VSC OFF switch (integration control and panel assembly) turns off TRC control and pressing and holding this switch turns off TRC and VSC controls. If VSC control is turned off, the VSC OFF indicator light will come on.

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   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

   
   
   • AClick here
   • B

     INSPECT CAN COMMUNICATION SYSTEM (Click here)

2. Click here

   CHECK IF BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY CONNECTOR IS SECURELY CONNECTED

   
   

   1. Check if the skid control ECU (brake booster with master cylinder assembly) connector is securely connected.

      OK
      The connector is securely connected.

   
   
   • OKClick here
   • NG

     CONNECT CONNECTOR TO BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY CORRECTLY

3. Click here

   CHECK AUXILIARY BATTERY

   
   

   1. Check the auxiliary battery voltage.

      Standard Voltage
      Tester Connection Condition Specified Condition Auxiliary battery Power switch on (IG) 11 to 14 V Auxiliary battery Power switch on (READY) 11 to 15.5 V

   
   
   • OKClick here
   • NG

     CHARGE OR REPLACE AUXILIARY BATTERY

4. Click here

   READ VALUE USING GTS (VSC OFF SWITCH)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch on (IG).

   3. Select the Data List on the GTS (Click here).

      Table 1. ABS/VSC/TRC

      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	-

   4. Using the GTS, check that the switch condition on the GTS changes according to VSC OFF switch (integration control and panel assembly) operation.

      OK
      The GTS display changes according to VSC OFF switch (integration control and panel assembly) operation.

   
   
   • OKClick here
   • NGClick here
5. Click here

   INSPECT COMBINATION METER ASSEMBLY

   
   

   1. Turn the power switch off.

   2. Perform the Active Test of the combination meter assembly (meter CPU) using the GTS (Click here).

   3. Check the combination meter assembly.

      OK
      The VSC OFF indicator light turns on or off in accordance with GTS operation.

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

      Tip:

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

   
   
   • A

     REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

   • B

     REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

   • C

     REPLACE COMBINATION METER ASSEMBLY (Click here)

6. Click here

   INSPECT INTEGRATION CONTROL AND PANEL ASSEMBLY

   
   

   1. Turn the power switch off.

   2. Inspect the VSC OFF switch (integration control and panel assembly) (Click here).

      OK
      The VSC OFF switch (integration control and panel assembly) is normal.

   
   
   • OKClick here
   • NG

     REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY (Click here)

7. Click here

   CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - INTEGRATION CONTROL AND PANEL ASSEMBLY)

   
   

   1. Disconnect the A24 skid control ECU (brake booster with master cylinder assembly) connector.

   2. Disconnect the H71 VSC OFF switch (integration control and panel assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition A24-8 (CSW) - H71-7 (+) Always Below 1 Ω A24-8 (CSW) - Body ground Always 10 kΩ or higher H71-5 (E) - Body ground Always Below 1 Ω

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

      Tip:

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

   
   
   • A

     REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

   • B

     REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (Click here)

   • C

     REPAIR OR REPLACE HARNESS OR CONNECTOR