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Inspection Procedure

  1. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (STOP LIGHT SWITCH) 
    1. Use the Data List to check if the stop light switch is functioning properly
      1. Intelligent tester

        MAIN BODY 

        DATA LIST - MAIN BODY

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        STOP LIGHT SW Stop light switch/ON or OFF ON: Brake pedal depressed
        OFF: Brake pedal released        		 -
      2. Techstream

        Main Body 

        DATA LIST - MAIN BODY

        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        Stop Light SW Stop light switch/ON or OFF ON: Brake pedal depressed
        OFF: Brake pedal released        		 -

        Result 

        RESULT REFERENCE

        Result Proceed to
        Display on tester does not change according to brake pedal operation A
        Display on Jester changes according to brake pedal operation B

    B: REPLACE MAIN BODY ECU 

    A: Go to next Step 

  2. INSPECT FUSE (STOP) 
    1. Remove the STOP fuse from the main body ECU
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      STOP fuse Always Below 1 Ω

    NG: REPLACE FUSE 

    OK: Go to next Step 

  3. INSPECT STOP LIGHT SWITCH 
    1. Disconnect the A35 stop light switch connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      1 - 2 Stop light switch pin not pushed Below 1 Ω
      3 - 4 Stop light switch pin pushed Below 1 Ω
      1 - 2 Stop light switch pin pushed 10 kΩ or higher
      3 - 4 Stop light switch pin not pushed 10 kΩ or higher

    NG: REPLACE STOP LIGHT SWITCH  (See DISASSEMBLY )

    Fig 1: Inspecting Stop Light Switch
    G05780683Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next Step 

  4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY, STOP LIGHT SWITCH) 
    Fig 2: Identifying DH Main Body ECU And A35 Stop Light Switch Connectors
    G05780684Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the DH main body ECU connector.
    2. Disconnect the A35 stop light switch connector.
    3. Measure the voltage and resistance according to the value (s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      A35-2 - Body ground Always 11 to 14 V

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      DH-15 (STP) - A35-1 Always Below 1 Ω
      DH-15 (STP) or A35-1-Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE MAIN BODY ECU 

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