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Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (REAR JUNCTION BLOCK ECU) 
    1. Using the intelligent tester or Techstream, read the Data List.
      1. Intelligent tester

        BODY NO. 4 

        INTELLIGENT TESTER BODY NO. 4 REFERENCE CHART

        Tester Display Measurement Item / Range Normal Condition Diagnostic Note
        TAIL LGT Tr Status of taillight / OK or Break OK: Taillight circuit is normal
        Break: Taillight circuit is malfunctioning        		 Confirm that headlight dimmer switch is ON (TAIL or HEAD)
        STOP LGT Tr Status of stop light / OK or Break OK: Stop light circuit is normal
        Break: Stop light circuit is malfunctioning        		 Confirm that brake pedal is pressed
        H-M STP LGT Tr Status of high mount stop light / OK or Break OK: High mount stop light circuit is normal
        Break: High mount stop light circuit is malfunctioning        		 Confirm that brake pedal is pressed
      2. Techstream

        Body No. 4 

        TECHSTREAM BODY NO. 4 REFERENCE CHART

        Tester Display Measurement Item / Range Normal Condition Diagnostic Note
        Tail Light Tr Status of taillight / OK or Break OK: Taillight circuit is normal
        Break: Taillight circuit is malfunctioning        		 Confirm that headlight dimmer switch is ON (TAIL or HEAD)
        Stop Light Tr Status of stop light / OK or Break OK: Stop light circuit is normal
        Break: Stop light circuit is malfunctioning        		 Confirm that brake pedal is pressed
        High Mount Stop Light Tr Status of high mount stop light / OK or Break OK: High mount stop light circuit is normal
        Break: High mount stop light circuit is malfunctioning        		 Confirm that brake pedal is pressed

        Result 

        RESULT CHART

        Result Proceed to
        Item (TAIL LGT Tr) displays "Break" on tester A
        Item (STOP LGT Tr) displays "Break" is on tester B
        Item (H-M STP LGT Tr) displays "Break" on tester C
        All items display "OK" on tester D

    B:  Go to step  4

    C:  Go to step  6

    D:  Go to step  8

    A: Go to next step 

  2. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (TAILLIGHT AND LICENSE PLATE LIGHT) 
    1. Disconnect the connectors in the following order. Rear combination light (LH, RH), rear light (LH, RH), license plate light
    2. Using the intelligent tester or Techstream, read the Data List
      1. Intelligent tester

        BODY NO. 4 

        INTELLIGENT TESTER BODY NO. 4 REFERENCE CHART

        Tester Display Measurement Item / Range Normal Condition Diagnostic Note
        TAIL LGT Tr Status of taillight / OK or Break OK: Taillight circuit is normal
        Break: Taillight circuit is malfunctioning        		 Confirm that headlight dimmer switch is ON (TAIL or HEAD)
      2. Techstream

        Body No. 4 

        TECHSTREAM BODY NO. 4 REFERENCE CHART

        Tester Display Measurement Item / Range Normal Condition Diagnostic Note
        Tail Light Tr Status of taillight / OK or Break OK: Taillight circuit is normal
        Break: Taillight circuit is malfunctioning        		 Confirm that headlight dimmer switch is ON (TAIL or HEAD)

        Result 

        RESULT CHART

        Disconnected Light Result Proceed to
        • Rear combination light
        • Rear light
        • License plate light
        		 Displayed "Break" on tester A
        Rear combination light Displayed "OK" is on tester B
        Rear light Displayed "OK" is on tester C
        License plate light Displayed "OK" is on tester D

    B: REPLACE REAR COMBINATION LIGHT ASSEMBLY  (See REMOVAL  )

    C: REPLACE REAR LIGHT ASSEMBLY  (See REMOVAL  )

    D: REPLACE LICENSE PLATE LIGHT  (See REMOVAL  )

    A: Go to next step 

  3. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (REAR JUNCTION BLOCK ECU) 
    1. Disconnect the connectors in the following order- S63, S64 rear junction block ECU connector.
    2. Using the intelligent tester or Techstream, read the Data List
      1. Intelligent tester

        BODY NO. 4 

        INTELLIGENT TESTER BODY NO. 4 REFERENCE CHART

        Tester Display Measurement Item / Range Normal Condition Diagnostic Note
        TAIL LGT Tr Status of taillight / OK or Break OK: Taillight circuit is normal
        Break: Taillight circuit is malfunctioning        		 Confirm that headlight dimmer switch is ON (TAIL or HEAD)
      2. Techstream

        Body No. 4 

        TECHSTREAM BODY NO. 4 REFERENCE CHART

        Tester Display Measurement Item / Range Normal Condition Diagnostic Note
        Tail Light Tr Status of taillight / OK or Break OK: Taillight circuit is normal
        Break: Taillight circuit is malfunctioning        		 Confirm that headlight dimmer switch is ON (TAIL or HEAD)

        Result 

        RESULT CHART

        Result Proceed to
        "Break" display does not change A
        Changes to "Normal" display B

    B: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A: REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU) 

  4. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (STOP LIGHT) 
    1. Disconnect the connectors in the following order Rear combination light (LH, RH), rear light (LH, RH).
    2. Using the intelligent tester or Techstream, read the Data List.
      1. Intelligent tester

        BODY NO. 4 

        INTELLIGENT TESTER BODY NO. 4 REFERENCE CHART

        Tester Display Measurement Item / Range Normal Condition Diagnostic Note
        STOP LGT Tr Status of stop light / OK or Break OK: or Stop light circuit is normal
        Break: Stop light circuit is malfunctioning        		 Confirm that brake pedal is pressed
      2. Techstream

        Body No. 4 

        TECHSTREAM BODY NO. 4 REFERENCE CHART

        Tester Display Measurement Item / Range Normal Condition Diagnostic Note
        Stop Light Tr Status of stop light / OK or Break OK: Stop light circuit is normal
        Break: Stop light circuit is malfunctioning        		 Confirm that brake pedal is pressed

        Result 

        RESULT CHART

        Disconnected Light Result Proceed to
        • Rear combination light
        • Rear light
        		 "Break" display does not change A
        Rear combination light Changes to "Normal" display B
        Rear light Changes to "Normal" display C

        HINT:

        Disconnect the RH connector, then the LH connector. If the display changes to "Normal", it can be determined that the disconnected light is malfunctioning

    B: REPLACE REAR COMBINATION LIGHT ASSEMBLY  (See REMOVAL  )

    C: REPLACE REAR LIGHT ASSEMBLY  (See REMOVAL  )

    A: Go to next step 

  5. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (REAR JUNCTION BLOCK ECU) 
    1. Disconnect the connectors in the following order: S63, S64 rear junction block ECU connector
    2. Using the intelligent tester or Techstream, read the Data List
      1. Intelligent tester

        BODY NO. 4 

        INTELLIGENT TESTER BODY NO. 4 REFERENCE CHART

        Tester Display Measurement Item / Range Normal Condition Diagnostic Note
        STOP LGT Tr Status of stop light / OK or Break OK: Stop light circuit is normal
        Break: Stop light circuit is malfunctioning        		 Confirm that brake pedal is pressed
      2. Techstream

        Body No. 4 

        TECHSTREAM BODY NO. 4 REFERENCE CHART

        Tester Display Measurement Item / Range Normal Condition Diagnostic Note
        Stop Light Tr Status of stop light / OK or Break OK: Stop light circuit is normal
        Break: Stop light circuit is malfunctioning        		 Confirm that brake pedal is pressed

        Result 

        RESULT CHART

        Result Proceed to
        "Break" display does not change A
        Changes to "Normal" display B

    B: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A: REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU) 

  6. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (CENTER STOP LIGHT) 
    1. Disconnect the connectors in the following order Center stop light.
    2. Using the intelligent tester or Techstream, read the Data List.
      1. Intelligent tester

        BODY NO. 4 

        INTELLIGENT TESTER BODY NO. 4 REFERENCE CHART

        Tester Display Measurement Item / Range Normal Condition Diagnostic Note
        H-M STP LGT Tr Status of high mount stop light / OK or Break OK: High mount stop light circuit is normal
        Break: High mount stop light circuit is malfunctioning        		 Confirm that brake pedal is pressed
      2. Techstream

        Body No. 4 

        TECHSTREAM BODY NO. 4 REFERENCE CHART

        Tester Display Measurement Item / Range Normal Condition Diagnostic Note
        High Mount Stop Light Tr Status of high mount stop light / OK or Break OK: High mount stop light circuit is normal
        Break: High mount stop light circuit is malfunctioning        		 Confirm that brake pedal is pressed

        Result 

        RESULT CHART

        Result Proceed to
        "Break" display does not change A
        Changes to "Normal" display B

    B: REPLACE CENTER STOP LIGHT ASSEMBLY  (See REMOVAL  )

    A: Go to next step 

  7. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (REAR JUNCTION BLOCK ECU) 
    1. Disconnect the connectors in the following order: S62 rear junction block ECU connector.
    2. Using the intelligent tester or Techstream, read the Data List
      1. Intelligent tester

        BODY NO. 4 

        INTELLIGENT TESTER BODY NO. 4 REFERENCE CHART

        Tester Display Measurement Item / Range Normal Condition Diagnostic Note
        H-M STP LGT Tr Status of high mount stop light / OK or Break OK: High mount stop light circuit is normal
        Break: High mount stop light circuit is malfunctioning        		 Confirm that brake pedal is pressed
      2. Techstream

        Body No. 4 

        TECHSTREAM BODY NO. 4 REFERENCE CHART

        Tester Display Measurement Item / Range Normal Condition Diagnostic Note
        High Mount Stop Light Tr Status of high mount stop light / OK or Break OK: High mount stop light circuit is normal
        Break: High mount stop light circuit is malfunctioning        		 Confirm that brake pedal is pressed

        Result 

        RESULT CHART

        Result Proceed to
        "Break" display does not change A
        Changes to "Normal" display B

    B: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A: REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU) 

  8. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT - REAR JUNCTION BLOCK ECU AND BODY GROUND) 
    1. Disconnect the S63 ECU connector
    2. Disconnect the S37 light connector
    3. Measure the resistance according to the value (s) in the table below

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      S63-15 (LCE2) - S37-1 Always Below 1 Ω
      S37-2 - Body ground Always Below 1 Ω
      S63-15 (LCE2) - Body ground Always 10 kΩ or higher
      Fig 1: Identifying S63 ECU And S37 Light Connector Terminals
      G05782610Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (REAR LIGHT - REAR JUNCTION BLOCK ECU AND BODY GROUND) 
    Fig 2: Identifying S63 ECU And S33, S41 Light Connector Terminals
    G05782611Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the S63 ECU connector
    2. Disconnect the S33 and S41 light connectors
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance: 

      for LH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      S63-13 (TIL4) - S33-2 (T/P) Always Below 1 Ω
      S63-4 (STP3) - S33-1 (B) Always Below 1 Ω
      S33-4 (E) - Body ground Always Below 1 Ω
      S63-13 (TIL4) - Body ground Always 10 kΩ or higher
      S63-4 (STP3) - Body ground Always 10 kΩ or higher

      for RH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      S63-14 (TIL3) - S41-2 (T/P) Always Below 1 Ω
      S63-4 (STP3) - S41-1 (B) Always Below 1 Ω
      S41-4 (E) - Body ground Always Below 1 Ω
      S63-14 (TIL3) - Body ground Always 10 kΩ or higher
      S63-4 (STP3) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT - REAR JUNCTION BLOCK ECU AND BODY GROUND) 
    1. Disconnect the S64 ECU connector.
    2. Disconnect the S51 and S52 light connectors.
    3. Measure the resistance according to the value (s) in the table below

      Standard resistance: 

      for LH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      S64-3 (TIL2) - S51-3 (TL) Always Below 1 Ω
      S64-9 (STP2) - S51-1 (STP) Always Below 1 Ω
      S51-4 (E) - Body ground Always Below 1 Ω
      S64-3 (TIL2) - Body ground Always 10 kΩ or higher
      S64-9 (STP2) - Body ground Always 10 kΩ or higher

      for RH 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      S64-7 (TIL1) - S52-3 (TL) Always Below 1 Ω
      S64-10 (STP1) - S52-1 (STP) Always Below 1 Ω
      S52-4 (E) - Body ground Always Below 1 Ω
      S64-7 (TIL1) - Body ground Always 10 kΩ or higher
      S64-10 (STP1) - Body ground Always 10 kΩ or higher
      Fig 3: Identifying S64 ECU And S51, S52 Light Connector Terminals
      G05782612Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  11. CHECK HARNESS AND CONNECTOR (CENTER STOP LIGHT - REAR JUNCTION BLOCK ECU AND BODY GROUND) 
    1. Disconnect the S62 ECU connector.
    2. Disconnect the S20 light connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Condition Specified Condition
      S62-6 (STP4) - S20-1 Always Below 1 Ω
      S20-2 - Body ground Always Below 1 Ω
      S62-6 (STP4) - Body ground Always 10 kΩ or higher
      Fig 4: Identifying S62 ECU And S20 Light Connector Terminals
      G05782613Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU) 

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