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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 512 (ELECTRONICALLY CONTROLLED BRAKE SYSTEM - DIAGNOSIS)DTC C1249/49: OPEN CIRCUIT IN STOP LIGHT SWITCH CIRCUITINSPECTION PROCEDURE
2004 Toyota Matrix XR, FWD, Standard

Inspection Procedure

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection Procedure
WARNING: This page is about a different car, the 2004 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK STOP LAMP SWITCH OPERATION 
    1. Check that the stop light comes on when the brake pedal is depressed and turns off when the brake pedal is released.

    OK: Go To Next Step 

    TABLE PEDAL ILLUMINATION CONDITION

    Pedal Condition Illumination Condition
    Brake pedal depressed ON
    Brake pedal released OFF

    NG: Go to step   4 

    HINT:

    Check the stop lamp bulb as it may have burnt out.

    OK: Go To Next Step 

  2. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE 
    1. Measure the voltage according to the value(s) in the table below.

    HINT:

    Measure the voltage from behind the connector with the connector connected to the skid control ECU.

    Standard: 

    TABLE TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Switch Condition Specified Condition
    S8-14 (STP) - Body ground Brake pedal depressed 8 to 14 V
    S8-14 (STP) - Body ground Brake pedal released Below 1 V

    NG: Go to step   4 

    Fig 1: Inspecting Skid Control ECU Terminal Voltage
    G02918187Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go To Next Step 

  3. RECONFIRM DTC 
    1. Clear the DTCs (see DTC CHECK CLEAR  ).
    2. Turn the power switch ON (READY).
    3. Check the same DTCs are recorded (see DTC CHECK CLEAR  ).

    Result: 

    TABLE DIAGNOSTIC TROUBLE CODES OUTPUT

    Result Go To
    DTC is not output A
    DTC is output B

    B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE  PROBLEM SYMPTOMS TABLE   ) 

    A 

    REPLACE SKID CONTROL ECU ASSY (SEE  SKID CONTROL ECU ASSY  ) 

    NOTE: When replacing the skid control ECU assy, perform initialization of linear solenoid valve and calibration (see INITIALIZATION  ).
  4. INSPECT STOP LAMP SWITCH ASSY 
    1. Disconnect the stop lamp switch assy connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard: 

      TABLE TESTER CONNECTION SPECIFIED CONDITION

      Switch Condition Tester Connection Specified Condition
      Switch pin free 1 - 2 Below1 Ω
      Switch pin pushed in 1 - 2 10 kΩ or higher

    NG: REPLACE STOP LAMP SWITCH ASSY 

    Fig 2: Inspecting Stop Light Switch Assembly
    G02918188Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go To Next Step 

  5. CHECK HARNESS AND CONNECTOR (STOP LAMP SWITCH - SKID CONTROL ECU) 
    1. Disconnect the stop lamp switch connector and skid control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

    Standard: 

    TABLE TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Specified Condition
    S8-14 (STP) - S16-1 Below 1 Ω.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 3: Checking Harness And Connector
    G02918189Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE SKID CONTROL ECU ASSY (SEE  SKID CONTROL ECU ASSY  ) 

    NOTE: When replacing the skid control ECU assy, perform initialization of linear solenoid valve and calibration (see INITIALIZATION  ).
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.