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Home >> Scion >> 2009 >> xD Automatic >> Repair and Diagnosis >> Brakes >> Traction Control >> Brakes - Abs >> Vehicle Stability Control System >> DTC C1249/49 Open in Stop Light Switch Circuit >> Inspection Procedure

Inspection Procedure

NOTE: When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION  ).
  1. INSPECT STOP FUSE 
    1. Remove the STOP fuse from the main body ECU (instrument panel junction block).
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      STOP (10 A) fuse Always Below 1 Ω

    NG: REPLACE STOP FUSE 

    Fig 1: Identifying STOP Fuse
    G05401219Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  2. CHECK STOP LIGHT OPERATION 
    1. Install the STOP fuse.
    2. Check that the stop light comes on when the brake pedal is depressed, and goes off when the brake pedal is released.

      OK 

      CONDITION CHART

      Condition Illumination Condition
      Brake pedal depressed ON
      Brake pedal released OFF

    NG:  Go to step  7

    OK: Go to next step 

  3. INSPECT SKID CONTROL ECU (STP TERMINAL) 
    1. Disconnect the skid control ECU connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      A15-2 (STP) - Body ground Stop light switch ON (Brake pedal depressed) 8 to 14 V
      A15-2 (STP) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V

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

    Fig 2: Identifying Skid Control ECU Connector Terminal (STP Terminal)
    G05401220Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  4. INSPECT SKID CONTROL ECU (IG1 TERMINAL) 
    1. Turn the ignition switch to ON.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      A15-34 (IG1) - Body ground Ignition switch ON 11 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) 

    Fig 3: Identifying Skid Control ECU Connector Terminal (IG1 Terminal)
    G05401221Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  5. INSPECT SKID CONTROL ECU (GND TERMINAL) 
    1. Turn the ignition switch to OFF.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A15-1 (GND1) - Body ground Always Below 1 Ω

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

    Fig 4: Identifying Skid Control ECU Connector Terminal (GND Terminal)
    G05401222Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  6. RECONFIRM DTC 
    1. Reconnect the skid control ECU connector.
    2. Clear the DTC (See DTC CHECK/CLEAR  ).
    3. Start the engine.
    4. Depress the brake pedal several times to test the stop light circuit.
    5. Check if the same DTC is recorded (See DTC CHECK/CLEAR  ).

      Result 

      RESULT CHART

      Result Proceed to
      DTC not output A
      DTC output B

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See PROBLEM SYMPTOMS TABLE  ).

    B : REPLACE BRAKE ACTUATOR ASSEMBLY  (See REMOVAL  )

    A : CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)  (See CHECK FOR INTERMITTENT PROBLEMS  )

  7. 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.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A11-2 - Body ground Always 11 to 14 V

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

    Fig 5: Identifying Stop Light Switch Connector Terminals (Power Source Terminal)
    G05401223Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  8. INSPECT STOP LIGHT SWITCH 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch 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  (See REMOVAL )

    Fig 6: Identifying Stop Light Switch Connector Terminals
    G05401224Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - STOP LIGHT SWITCH) 
    1. Disconnect the skid control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A15-2 (STP) - A11-1 Always Below 1 Ω
      A15-2 (STP) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 7: Identifying Skid Control ECU Connector Terminal And Stop Light Switch Connector Terminals
    G05401225Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  10. RECONFIRM DTC 
    1. Reconnect the skid control ECU connector and the stop light switch connector.
    2. Clear the DTC (See DTC CHECK/CLEAR  ).
    3. Start the engine.
    4. Depress the brake pedal several times to test the stop light circuit.
    5. Check if the same DTC is recorded (See DTC CHECK/CLEAR  ).

      Result 

      RESULT CHART

      Result Proceed to
      DTC not output A
      DTC output B

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See PROBLEM SYMPTOMS TABLE  ).

    B : REPLACE BRAKE ACTUATOR ASSEMBLY  (See REMOVAL  )

    A : INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT)  (See STOP LIGHT CIRCUIT )

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