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Inspection Procedure

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

      Main Body 

      ITEM RANGE REFERENCE

      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      		 -

      OK: ON (brake pedal depressed) appears on screen. 

      NG: REPLACE MAIN BODY ECU 

      OK: Go to next step. 

  2. INSPECT FUSE (STOP) 
    1. Remove the STOP fuse from the main body ECU.
    2. Measure the resistance of the fuse.

      Standard resistance 

      RESISTANCE REFERENCE

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

      Standard resistance 

      RESISTANCE REFERENCE

      Tester Connection Switch Condition Specified Condition
      1 - 2 Stop light switch pin not pushed Below 1 Ω
      3 - 4 Stop light switch pin not pushed 10 kΩ or higher
      1 - 2 Stop light switch pin pushed 10 kΩ or higher
      3 - 4 Stop light switch pin pushed Below 1 Ω
      Fig 1: Identifying Stop Light Switch Connector Terminal
      G04943852Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE STOP LIGHT SWITCH  (See STOP LIGHT SWITCH )

      OK: Go to next step. 

  4. CHECK WIRE HARNESS (STOP LIGHT SWITCH - MAIN BODY ECU AND BATTERY) 
    Fig 2: Identifying Stop Light Switch Connector Terminal And Main Body ECU Connector Terminal
    G04943853Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A35 stop light switch connector.
    2. Disconnect the DH main body ECU connector.
    3. Measure the voltage and resistance according to the value(s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION

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

      Standard resistance 

      RESISTANCE REFERENCE

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

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to next step. 

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

      Body No. 4 

      ITEM RANGE REFERENCE

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

      OK: ON (brake pedal depressed) appears on screen. 

      NG: REPLACE MAIN BODY ECU 

      OK: GO TO LIGHTING SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

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