LEMON Manuals: Even more car manuals for everyone
Home >> Scion >> 2008 >> tC Spec, Standard >> Repair and Diagnosis >> Brakes >> Traction Control >> Brakes - Abs >> Anti-Lock Brake System >> Brake Warning Light Circuit >> Inspection Procedure

Inspection Procedure

CAUTION: When releasing the parking brake, set the chocks to hold the vehicle for safety.
  1. CHECK BRAKE FLUID 
    1. Check that the brake fluid level is proper.

    NG: ADD BRAKE FLUID 

    OK: Go to next step 

  2. CHECK DTC FOR ABS 
    1. Are the DTC recorded (See DTC CHECK/CLEAR  )?

    YES: REPAIR CIRCUIT INDICATED BY OUTPUT CODE 

    NO: Go to next step 

  3. CHECK BRAKE WARNING LIGHT 
    1. WHEN USING INTELLIGENT TESTER:
      1. Connect the intelligent tester to the DLC3.
      2. Start the engine.
      3. Select the tester menus: DIAGNOSTIC, OBD/MOBD, ABS/VSC and ACTIVE TEST.
      4. Read the BRAKE WARN LIGHT status.
        ACTIVE TEST REFERENCE

        Tester Display Vehicle Condition/Test Details Diagnostic Note
        BRAKE WARN LIGHT Turns BRAKE warning light ON/OFF Observe combination meter

        OK: 

        The BRAKE warning light turns on or off in accordance with the intelligent tester. 

    2. WHEN NOT USING INTELLIGENT TESTER:
      1. Turn the ignition switch OFF and disconnect the S1 skid control ECU connector.
        2. Fig 1: Identifying Skid Control ECU Connectors Terminals
        G05540336Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Ground terminal BRL of the skid control ECU.
      3. Turn the ignition switch to the ON position.
      4. Check the BRAKE warning light.

        OK 

        ACTIVE TEST REFERENCE

        BRL - GND Condition Illumination Condition
        Connected OFF
        Disconnected ON

    OK: REPLACE BRAKE ACTUATOR ASSEMBLY 

    NG: Go to next step 

  4. INSPECT PARKING BRAKE SWITCH ASSEMBLY 
    1. Remove the parking brake switch assembly.
    2. Measure the resistance of the parking brake switch.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      P6-1 - Ground part Released Below 1 Ω
      P6-1 - Ground part Pushed in 10 kΩ or higher
      Fig 2: Identifying Resistance Of Parking Brake Switch
      G05540337Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE PARKING BRAKE SWITCH ASSEMBLY 

    OK: Go to next step 

  5. CHECK WIRE HARNESS (PARKING BRAKE SWITCH ASSEMBLY - SKID CONTROL ECU) 
    1. Disconnect the S1 skid control ECU connector.
      2. Fig 3: Identifying S1 Skid Control ECU Connector And P6 Parking Brake Switch Assembly Connectors Terminals
      G05540338Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the P6 parking brake switch assembly connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      S1-18 (PKB) - P6-1 (PKB) Below 1 Ω
      S1-18 (PKB) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  6. INSPECT BRAKE FLUID LEVEL WARNING SWITCH 
    1. Remove the reservoir tank cap and strainer.
    2. Disconnect the brake fluid level warning switch connector.
      3. Fig 4: Identifying Brake Fluid Level Warning Switch
      G05540339Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance of the brake fluid level warning switch.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      B2-1 - B2-2 Float UP 10 kΩ or higher
      B2-1 - B2-2 Float DOWN Below 1 Ω

    NG: REPLACE BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY 

    OK: Go to next step 

  7. CHECK WIRE HARNESS (BRAKE FLUID LEVEL WARNING SWITCH - COMBINATION METER) 
    1. Disconnect the C6 combination meter connector.
      2. Fig 5: Identifying C6 Combination Meter Connector And B2 Brake Fluid Level Warning Switch Connectors Terminals
      G05540340Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the B2 brake fluid level warning switch connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      C6-12 - B2-1 Below 1 Ω
      C6-12 - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  8. CHECK WIRE HARNESS (SKID CONTROL ECU - COMBINATION METER) 
    1. Disconnect the S1 skid control ECU connector.
      2. Fig 6: Identifying S1 Skid Control ECU Connector And C6 Combination Meter Connectors Terminals
      G05540341Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the C6 combination meter connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      S1-32 (BRL) - C6-10 Below 1 Ω
      S1-32 (BRL) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  9. INSPECT COMBINATION METER ASSEMBLY 
    1. Check combination meter assembly (See PROBLEM SYMPTOMS TABLE ).

    NG: CHECK COMBINATION METER ASSEMBLY 

    OK: REPLACE BRAKE ACTUATOR ASSEMBLY 

scientia non olet · About LEMON Manuals