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Inspection Procedure

  1. READ VALUE OF DATA LIST 

    HINT:

    According to the DATA LIST displayed by the OBD II scan tool or intelligent tester, you can read the value of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of troubleshooting is one method to shorten labor time.

    1. Warm up the engine.
    2. Turn the ignition switch off.
    3. Connect the OBD II scan tool or intelligent tester together with the CAN VIM (controller area network vehicle interface module) to the DLC3.
    4. Turn the ignition switch to the ON position.
    5. Turn on the tester.
    6. Select the item "DIAGNOSIS / OBD/MOBD / ECT / DATA LIST".
    7. According to the display on the tester, read the "DATA LIST".
      DATA LIST

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      STOP LIGHT SW Stop Light Switch Status/ON or OFF
      • Brake pedal is depressed: ON
      • Brake pedal is released: OFF
      		 -
      NOTE: In the table below, the value listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether apart is faulty or not.

    OK: Go to step   3 

    NG: GO TO NEXT STEP 

  2. INSPECT STOP LIGHT SWITCH ASSEMBLY 
    1. Remove the stop light switch assembly.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      STOP LIGHT SWITCH ASSEMBLY STANDARD RESISTANCE SPECIFICATIONS

      Switch position Tester Connection Specified Condition
      Switch pin free 1 -2 Below 1 Ω
      Switch pin pushed in ↑ 10 kΩ or higher
      Switch pin free 3-4 10 kΩ or higher
      Switch pin pushed in ↑ Below 1 Ω

    NG: REPLACE STOP LIGHT SWITCH ASSEMBLY 

    Fig 1: Identifying Stop Light Switch Assembly Connector Terminals
    G04866086Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO TO NEXT STEP 

  3. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM) 
    1. Install the stop light switch assembly.
    2. Disconnect the ECM connector.
    3. Measure the voltage according to the value(s) in the table below when the brake pedal is depressed and released.

      Standard voltage 

      HARNESS AND CONNECTOR STANDARD VOLTAGE SPECIFICATIONS

      Condition Tester Connection Specified Condition
      Brake pedal Is depressed E5-4 (STP) - Body ground 10 to 14 V
      Brake pedal Is released Below 1 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Identifying Stop Light Switch Assembly ECM Connector Terminals
    G04866087Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE ECM 

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