VEHICLE STABILITY CONTROL SYSTEM Brake Warning Light Remains ON

DESCRIPTION

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

If any of the following is detected, the brake warning light remains on:


WIRING DIAGRAM

A005HGTE02

CAUTION / NOTICE / HINT

Note


  • When replacing the skid control ECU (brake actuator assembly), perform zero point calibration Click here.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication system DTCs are output Click here.

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

    B

    CHECK CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED


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

      OK
      The connector is securely connected.

    NG

    CONNECT CONNECTOR TO ECU CORRECTLY

    OK

  3. INSPECT BATTERY


    1. Check the battery voltage.

      Standard voltage
      11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (for 1ND-TV) B
      NG (for 1NR-FE) C
      NG (for 1NZ-FE) D

    B

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    C

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    D

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    A

  4. CHECK TERMINAL VOLTAGE (IG1)


    1. Disconnect the A54*1 or A56*2 skid control ECU (brake actuator assembly) connector.


      • *1: except LHD with CVT

      • *2: for LHD with CVT

    2. Turn the ignition switch to ON.

    3. A005KZZE01
      Text in Illustration
      *A except LHD with CVT
      *B for LHD with CVT
      *a

      Front view of wire harness connector

      (to Skid control ECU (Brake actuator assembly))

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

      Standard Voltage
      except LHD with CVT
      Tester Connection Switch Condition Specified Condition
      A54-34 (IG1) - Body ground Ignition switch ON 11 to 14 V
      for LHD with CVT
      Tester Connection Switch Condition Specified Condition
      A56-34 (IG1) - Body ground Ignition switch ON 11 to 14 V

    4. Reconnect the A54*1 or A56*2 skid control ECU (brake actuator assembly) connector.


      • *1: except LHD with CVT

      • *2: for LHD with CVT

      Result
      Result Proceed to
      OK A
      NG (w/o Stop and Start System) B
      NG (w/ Stop and Start System for 1NR-FE) C
      NG (for 1NZ-FE) D

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

    C

    GO TO STOP AND START SYSTEM Click here

    D

    GO TO STOP AND START SYSTEM Click here

    A

  5. CHECK HARNESS AND CONNECTOR (GND1)


    1. Turn the ignition switch off.

    2. Disconnect the A54*1 or A56*2 skid control ECU (brake actuator assembly) connector.


      • *1: except LHD with CVT

      • *2: for LHD with CVT

    3. A005J2LE01
      Text in Illustration
      *A except LHD with CVT
      *B for LHD with CVT
      *a

      Front view of wire harness connector

      (to Skid control ECU (Brake actuator assembly))

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

      Standard Resistance
      except LHD with CVT
      Tester Connection Condition Specified Condition
      A54-1 (GND1) - Body ground Always Below 1 Ω
      for LHD with CVT
      Tester Connection Condition Specified Condition
      A56-1 (GND1) - Body ground Always Below 1 Ω

    4. Reconnect the A54*1 or A56*2 skid control ECU (brake actuator assembly) connector.


      • *1: except LHD with CVT

      • *2: for LHD with CVT


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  6. READ VALUE USING INTELLIGENT TESTER (PARKING BRAKE SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Parking Brake SW Parking brake switch / ON or OFF

      ON: Parking brake applied

      OFF: Parking brake released

      		 -

    4. Using the intelligent tester, check the input of the switch operation when the parking brake pedal is applied.

      OK
      When the parking brake is applied, the display changes as shown above.

    NG

    INSPECT PARKING BRAKE SWITCH ASSEMBLY Click here

    OK

  7. INSPECT BRAKE FLUID LEVEL WARNING SWITCH


    1. A005JHYE01
      Text in Illustration
      *a

      Component without harness connected

      (Brake Fluid Level Warning Switch)

      Turn the ignition switch off.

    2. Remove the reservoir filler cap and strainer.

    3. Disconnect the brake fluid level warning switch connector.

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

      Tech Tips

      A float is located inside the reservoir. Its position can be changed by increasing or decreasing the level of brake fluid.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 - 2 Switch OFF (Float up) 10 kΩ or higher
      1 - 2 Switch ON (Float down) Below 1 Ω

      Tech Tips

      If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level.

    5. Reconnect the brake fluid level warning switch connector.

    6. Reinstall the reservoir filler cap and strainer.

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

    B

    REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY (BRAKE FLUID LEVEL WARNING SWITCH) Click here

    C

    REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY (BRAKE FLUID LEVEL WARNING SWITCH) Click here

    A

  8. CHECK HARNESS AND CONNECTOR (COMBINATION METER - BRAKE FLUID LEVEL WARNING SWITCH)


    1. Disconnect the F1 combination meter assembly connector and the A25 brake fluid level warning switch connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F1-12 (SW) - A25-1 (+) Always Below 1 Ω
      A25-2 (E) - Body ground Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F1-12 (SW) or A25-1 (+) - Body ground Always 10 kΩ or higher

    3. Reconnect the F1 combination meter assembly connector and the A25 brake fluid level warning switch connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT COMBINATION METER ASSEMBLY


    1. Connect the intelligent tester to the DLC3.

    2. Perform Active Test of the combination meter assembly using the intelligent tester Click here.

      OK
      The brake warning light turns on or off in accordance with the intelligent tester.
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

      Tech Tips

      Reinstall the connectors and restore the vehicle to its prior condition before checking the combination meter assembly.


    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

  10. REPLACE COMBINATION METER ASSEMBLY


    1. Turn the ignition switch off.

    2. Replace the combination meter assembly Click here.


    NEXT

  11. INSPECT COMBINATION METER ASSEMBLY


    1. Connect the intelligent tester to the DLC3.

    2. Perform Active Test of the combination meter assembly using the intelligent tester Click here.

      OK
      The brake warning light turns on or off in accordance with the intelligent tester.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    A

    END

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  12. INSPECT PARKING BRAKE SWITCH ASSEMBLY


    1. Remove the parking brake switch assembly.

      Tech Tips


    2. Inspect the parking brake switch assembly.

      Tech Tips


      Result
      Result Proceed to
      OK A
      NG (for Pedal Type) B
      NG (for Lever Type) C

    B

    REPLACE PARKING BRAKE SWITCH ASSEMBLY Click here

    C

    REPLACE PARKING BRAKE SWITCH ASSEMBLY Click here

    A

  13. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - PARKING BRAKE SWITCH)


    1. Disconnect the 3A*1 or 3C*2 instrument panel junction block assembly connector and the F22*1 or A26*2 parking brake switch assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      3A-28 - F22-1*1 Always Below 1 Ω
      3C-30 - F26-1*2 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      3A-28 or F22-1 - Body ground*1 Always 10 kΩ or higher
      3C-30 or F26-1 - Body ground*2 Always 10 kΩ or higher

    3. Reconnect the 3A*1 or 3C*2 instrument panel junction block assembly connector and the F22*1 or A26*2 parking brake switch assembly connector.


      • *1: except 1NZ-FE

      • *2: for 1NZ-FE


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly Click here.

    2. Remove the main body ECU (multiplex network body ECU) from instrument panel junction block assembly.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      3A-28 - MB-12 (PKB)*1 Always Below 1 Ω
      3C-30 - MB-12 (PKB)*1 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      3A-28 or 12 - Body ground*1 Always 10 kΩ or higher
      3C-30 or 12 - Body ground*2 Always 10 kΩ or higher

    4. Reconnect the 3A*1 or 3C*2 main body ECU connector.


      • *1: except 1NZ-FE

      • *2: for 1NZ-FE


    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here