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Home >> Lexus >> 2008 >> LS 460 >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting >> Lighting System >> Room Light Control does not Operate >> Inspection Procedure

Inspection Procedure

NOTE: First perform the communication function inspections in HOW TO PROCEED WITH TROUBLESHOOTING to confirm that there are no LIN communication malfunctions before troubleshooting this symptom.
  1. CHECK CONDITION 
    1. Check the malfunction conditions.

    Result 

    RESULT CHART

    Result Proceed To
    All conditions below A
    Engine switch on (ACC) or (IG) → Engine switch off B
    All doors open → a door opened C
    All doors locked → a door unlocked D

    B: REPLACE MAIN BODY ECU 

    C: GO TO PROBLEM SYMPTOMS TABLE (COURTESY LIGHT)  (See PROBLEM SYMPTOMS TABLE )

    D: GO TO PROBLEM SYMPTOMS TABLE (DOOR UNLOCK)  (See PROBLEM SYMPTOMS TABLE )

    A: Go to next step 

  2. CONFIRM LIGHT POSITION 
    1. Check the malfunctioning dome light.

    Result 

    RESULT CHART

    Result Proceed To
    Front dome light and rear dome light A
    Front dome light B
    Rear dome light C

    B: REPLACE MAP LIGHT ASSEMBLY  (See MAP LIGHT ASSEMBLY )

    C:  Go to step  5

    A: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (MAP LIGHT - BODY GROUND) 
    1. Disconnect the X4 and X6 light connectors.
    2. Measure the resistance according to the value(s) in the table below.

    Standard Resistance 

    RESISTANCE SPECIFICATION CHART

    Tester Connection Condition Specified Condition
    X4-16 (GND9) - Body ground Always Below 1 Ω
    X6-20 (GND4) - Body ground Always Below 1 Ω
    Fig 1: Identifying X4 And X6 Light Connectors
    G04944754Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (BATTERY - MAP LIGHT) 
    1. Disconnect the X4 light connector.
    2. Measure the voltage according to the value(s) in the table below.

    Standard Voltage 

    VOLTAGE SPECIFICATION

    Tester Connection Condition Specified Condition
    X4-27 (DOME) - Body ground Always 11 to 14 V
    Fig 2: Identifying X4 Light Connector
    G04944755Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE MAP LIGHT ASSEMBLY  (See MAP LIGHT ASSEMBLY )

  5. CHECK MAP LIGHT ASSEMBLY (ILLB VOLTAGE) 
    1. Disconnect the X4 and X6 light connectors.
    2. Measure the voltage according to the value(s) in the table below.

    Standard Voltage 

    VOLTAGE SPECIFICATION

    Tester Connection Condition Specified Condition
    X4-11 (ILLB) - X6-20 (GND4) Always 11 to 14 V
    Fig 3: Identifying X4 And X6 Light Connectors
    G04944756Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE MAP LIGHT ASSEMBLY  (See MAP LIGHT ASSEMBLY )

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (MAP LIGHT - REAR MAP LIGHT) 
    1. Disconnect the X4, X6 and X12 light connectors.
    2. Measure the resistance according to the value(s) in the table below.

    Standard Resistance 

    RESISTANCE SPECIFICATION CHART

    Tester Connection Condition Specified Condition
    X4-11 (ILLB) - X12-8 (B) Always Below 1 Ω
    X6-18 (RILL) - X12-9(E) Always Below 1 Ω
    X4-11 (ILLB) - Body ground Always 10 kΩ or higher
    X6-18 (RILL) -Body ground Always 10 kΩ or higher
    Fig 4: Identifying X4, X6 And X12 Light Connectors
    G04944757Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. CHECK REAR MAP LIGHT (OPERATION) 
    1. Temporarily replace the rear map light with a new or normally functioning one (see REMOVAL ).
    2. Check the rear map light operation.

    OK: Rear map light operation is normal. 

    NG: REPLACE MAP LIGHT ASSEMBLY  (See MAP LIGHT ASSEMBLY )

    OK: REPLACE REAR MAP LIGHT  (See REMOVAL )

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