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Home >> Lexus >> 2008 >> IS 350 >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting >> Lighting System >> Interior Light Switch Signal Circuit >> Inspection Procedure

Inspection Procedure

  1. READ VALUE OF TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / (desired system) / Data List.
    5. Read the display on the Techstream.

      Body (Main Body ECU RH) 

      DIAGNOSTIC NOTE

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Illumination SW Front interior light switch (marked ON/OFF) signal/ ON or OFF ON: Front interior light switch (marked ON/OFF) is pushed in
      OFF: Front interior light switch (marked ON/OFF) is not pushed in      		 -

      Body No. 3 (Main Body ECU LH) 

      DIAGNOSTIC NOTE

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Interior Light Front interior light switch (marked DOOR) signal/ ON or OFF ON: Front interior light switch (marked ON/OFF) is pushed in
      OFF: Front interior light switch (marked ON/OFF) is not pushed in      		 -

      OK: 

      Switch condition can be displayed. 

      Result 

      RESULT CHART

      Result Proceed to
      Indication for "Illumination SW" does not change A
      Indication for "Interior Light" does not change B
      Indications for both "Illumination SW" and "Interior Light" do not change C
      OK D

    A: Go to step 2 

    B:  Go to step  4

    C:  Go to step  6

    D: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

  2. INSPECT OVERHEAD J/B 
    1. Remove the overhead J/B.
    2. Measure the resistance according to the value (s) in the table.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      R5-34 (CILL) - R5-18 (GND3) Front interior light switch (marked ON/ OFF) is not pushed In 10 kΩ or higher
      R5-34 (CILL) - R5-18 (GND3) Front interior light switch (marked ON/ OFF) is pushed in Approx. 10 Ω
      3. Fig 1: Identifying R5 Overhead J/B Connector
      G05832165Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE OVERHEAD J/B 

    OK: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (OVERHEAD J/B - MAIN BODY ECU RH) 
    1. Disconnect the R5 overhead J/B connector.
    2. Disconnect the J75 main body ECU RH connector.
    3. Measure the resistance according to the value (s) in the table.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      R5-34 (CILL) - J75-4 (UL2) Always Below 1 Ω
      R5-34 (CILL) - Body ground Always 10 kΩ or higher
      4. Fig 2: Identifying Harness And Connector (Overhead J/B - Main Body ECU RH)
      G05832166Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE MAIN BODY ECU LH (COWL SIDE J/B LH) 

  4. INSPECT OVERHEAD J/B 
    1. Remove the overhead J/B.
    2. Measure the resistance according to the value (s) in the table.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      R5-35 (DOOR) - R5-18 (GND3) Front Interior light switch (marked DOOR) is not pushed in 10 kΩ or higher
      R5-35 (DOOR) - R5-18 (GND3) Front Interior light switch (marked DOOR) is pushed in Approx. 10 Ω
      3. Fig 3: Identifying R5 Overhead J/B Connector
      G05832167Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE OVERHEAD J/B 

    OK: Go to Next Step 

  5. CHECK HARNESS AND CONNECTOR (OVERHEAD J/B - MAIN BODY ECU LH) 
    1. Disconnect the R5 overhead J/B connector.
    2. Disconnect the Q3 main body ECU LH connector.
    3. Measure the resistance according to the value (s) in the table.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      R5-35 (DOOR) - Q3-11 (BDCY) Always Below 1 Ω
      R5-35 (DOOR) - Body ground Always 10 kΩ or higher
      4. Fig 4: Identifying Harness And Connector (Overhead J/B - Main Body ECU LH)
      G05832168Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE MAIN BODY ECU LH (COWL SIDE J/B LH) 

  6. INSPECT OVERHEAD J/B 
    1. Remove the overhead J/B.
    2. Measure the resistance according to the value (s) in the table.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      R5-35 (DOOR) - R5-18 (GND3) Front interior light switch (marked DOOR) is not pushed in 10 kΩ or higher
      R5-35 (DOOR) - R5-18 (GND3) Front interior light switch (marked DOOR) is pushed in Approx. 10 Ω
      R5-34 (CILL) - R5-18 (GND3) Front interior light switch (marked ON/ OFF) is not pushed in 10 kΩ or higher
      R5-34 (CILL) - R5-18 (GND3) Front interior light switch (marked ON/ OFF) is pushed in Approx. 10 Ω
      3. Fig 5: Identifying R5 Overhead J/B Connector
      G05832169Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE OVERHEAD J/B 

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (OVERHEAD J/B GROUND CIRCUIT) 

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