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DTC C1249/49 Open in Stop Light Switch Circuit: Wiring Diagram

Fig 1: Identifying Stop Light Switch Wiring Diagram
G04025145Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE: When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration (See CHECK FOR INTERMITTENT PROBLEMS  ).
  1. INSPECT FUSE (STOP SW FUSE) 
    1. Remove the STOP SW fuse from the cowl side J/B RH.
    2. Check the STOP SW fuse.

      Resistance: 

      Below 1 Ω (Continuity) 

    NG : REPLACE FUSE (STOP SW FUSE) 

    OK : GO TO NEXT STEP 

  2. READ VALUE OF INTELLIGENT TESTER (STOP LIGHT SWITCH) 
    1. Connect the intelligent tester to the DLC3.
    2. Start the engine.
    3. Select the DATA LIST mode on the intelligent tester.

      ABS / VSC: 

      ITEM (DISPLAY) MEASUREMENT ITEM / RANGE (DISPLAY) AND NORMAL CONDITION CHART

      Item (Display) Measurement Item / Range (Display) Normal Condition
      STOP LAMP SW Stop light switch / ON or OFF ON: Brake pedal depressed
      OFF: Brake pedal released
    4. Check that the stop light observed on the intelligent tester changes when the brake pedal is depressed.

      OK: 

      When the brake pedal is depressed, the intelligent tester displays "ON". 

    NG : Go to step   8 

    OK : Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU TO STOP LIGHT SWITCH) 
    1. Disconnect the skid control ECU connector and stop light switch connector.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      A52-45 (STP) - A12-1 Below 1 Ω
    3. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      A52-45 (STP) - Body ground 10 kΩ or higher

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Identifying Harness And Connector (Skid Control ECU To Stop Light Switch)
    G04025146Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : Go to Next Step 

  4. INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL) 
    1. Disconnect the stop light switch connector.
    2. Measure the voltage according to the value(s) in the table below.

      Voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      A12-2 - Body ground 10 to 14 V

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

    Fig 3: Identifying Stop Light Switch Connector
    G04025147Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : Go to Next Step 

  5. INSPECT STOP LIGHT SWITCH 
    1. Disconnect the stop light switch connector.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

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

    NG : REPLACE STOP LIGHT SWITCH 

    Fig 4: Inspecting Stop Light Switch
    G04025148Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : Go to Next Step 

  6. INSPECT SKID CONTROL ECU (GND TERMINAL) 
    1. Disconnect the skid control ECU (A52, A54) connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      A52-1 (GND) - Body ground Below 1 Ω
      A54-1 (GND4) - Body ground Below 1 Ω

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) 

    Fig 5: Identifying Skid Control ECU Connector Terminals
    G04025149Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : Go to Next Step 

  7. RECONFIRM DTC 
    1. Clear the DTC (See DIAGNOSIS SYSTEM  ).
    2. Start the engine.
    3. Depress the brake pedal several times to test the stop light circuit.
    4. Check if the same DTC is recorded (See DIAGNOSIS SYSTEM  ).

      HINT:

      Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

      Result 

      DISPLAY (DTC OUTPUT) AND PROCEED TO REFERENCE CHART

      Display (DTC Output) Proceed To
      DTC (C1249/49) is not output A
      DTC (C1249/49) is output B

      HINT:

      If troubleshooting has been carried out according to the PROBLEM SYMPTOMS TABLE  .

    B : REPLACE SKID CONTROL ECU 

    A : END 

  8. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU TO LUGGAGE ROOM J/B ECU) 
    1. Disconnect the skid control ECU connector and luggage room J/B ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      A52-45 (STP) - LC-32 (STPI) Below 1 Ω
      A52-45 (STP) - Body ground 10 kΩ or higher

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 6: Identifying Harness And Connector (Skid Control ECU To Luggage Room J/B ECU)
    G04025150Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : INSPECT LIGHTING SYSTEM 

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