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

Inspection Procedure

  1. PERFORM ACTIVE TEST BY 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 / Body No. 3 / Active Test.
    5. Check the operation.

      Body No. 3 (Main Body ECU LH): 

      DIAGNOSTIC NOTE

      Tester Display Test Part Control Range Diagnostic Note
      Interior Light Operation Interior lights ON / OFF -

      OK: 

      The scuff plate light LH and RH come on. 

      Result 

      RESULT CHART

      Result Proceed to
      Scuff plate light LH does not comes on A
      Scuff plate light RH does not comes on B
      Neither LH nor RH light comes on C
      OK D

    B:  Go to step  5

    C:  Go to step  8

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

    A: Go to Next Step 

  2. INSPECT SCUFF PLATE LIGHT (FRONT LH) 
    1. Remove the scuff plate light.
    2. Connect the (+) lead from the battery to terminal 2 and the (-) lead to terminal 1, and then check that the scuff plate light comes on.

      OK: 

      The scuff plate light comes on. 

      3. Fig 1: Identifying Scuff Plate Light (Front LH)
      G05832141Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE SCUFF PLATE LIGHT 

    OK: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (SCUFF PLATE LIGHT - BODY GROUND) 
    1. Disconnect the Q8 scuff plate light connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      Q8-2 (+) - Body ground Always 10 to 14 V
      3. Fig 2: Identifying Harness And Connector (Scuff Plate Light - Body Ground)
      G05832142Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - SCUFF PLATE LIGHT) 
    1. Disconnect the Q8 scuff plate light connector.
    2. Disconnect the LA main body ECU LH connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      LA-19 (ILE1) - Q8-1 (-) Always Below 1 Ω
      LA-19 (ILE1) - Body ground Always 10 kΩ or higher
      4. Fig 3: Identifying Harness And Connector (Main Body ECU LH - Scuff Plate Light)
      G05832143Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

  5. INSPECT SCUFF PLATE LIGHT (FRONT RH) 
    1. Remove the scuff plate light.
    2. Connect the (+) lead from the battery to terminal 2 and the (-) lead to terminal 1, and then check that the scuff plate light comes on.

      OK: 

      The scuff plate light comes on. 

      3. Fig 4: Identifying Scuff Plate Light
      G05832144Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE SCUFF PLATE LIGHT 

    OK: Go to Next Step 

  6. CHECK HARNESS AND CONNECTOR (SCUFF PLATE LIGHT - BODY GROUND) 
    1. Disconnect the P2 scuff plate light connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      P2-2 (+) - Body ground Always 10 to 14 V
      3. Fig 5: Identifying P2 Scuff Plate Light Connector
      G05832145Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  7. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - SCUFF PLATE LIGHT) 
    1. Disconnect the P2 scuff plate light connector.
    2. Disconnect the LA main body ECU LH connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      LA-19 (ILE1) - P2-1 (-) Always Below 1 Ω
      LA-19 (ILE1) - Body ground Always 10 kΩ or higher
      4. Fig 6: Identifying Harness And Connector (Main Body ECU LH - Scuff Plate Light)
      G05832146Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

  8. CHECK HARNESS AND CONNECTOR (POWER SOURCE OF SCUFF PLATE LIGHT) 

    HINT:

    • If neither of the scuff plate lights comes on as a result of the ACTIVE TEST, there may be problems in the power source and main body ECU LH.
    • Perform the following inspection on either the LH or RH side.
    1. Disconnect the Q8 or P2 scuff plate light connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage: 

      Front Door LH 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      Q8-2 (+) - Body ground Always 10 to 14 V

      Front Door RH 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      P2-2 (+) - Body ground Always 10 to 14 V
      3. Fig 7: Identifying Harness And Connector (Power Source Of Scuff Plate Light)
      G05832147Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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