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Seat Illumination Circuit: Wiring Diagram

Fig 1: Wiring Diagram - Seat Illumination
G04049449Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  1. CHECK PERSONAL LIGHT (OPERATION) 

    HINT:

    The personal lights and seat illumination share the same power source circuit. Therefore, if none of them come on, inspect the power source circuit first.

    1. Push the personal light switches.
    2. Check that personal lights come on.

    OK: 

    Personal lights come on. 

    NG : Go to step  7

    OK: Go To Next Step 

  2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the intelligent tester main switch on.
    4. Select the item(s) in the ACTIVE TEST, and check the operation.

    ACTIVE TEST: BODY No. 3 (Main body ECU LH) 

    ACTIVE TEST: BODY NO. 3 (MAIN BODY ECU LH) REFERENCE

    Item Test Details Diagnostic Note
    INTERIOR LIGHT (DIM) Front and rear seat illumination ON / OFF -

    OK: 

    Front and rear seat illumination come on. 

    Result 

    RESULT REFERENCE

    Result Proceed to
    Front seat illumination does not come on A
    Rear seat illumination does not come on B
    Neither front nor rear seat illumination comes on C
    OK D

    HINT:

    If the rear seat illumination comes on normally, but the front seat illumination does not come on, there is an open circuit in the overhead J/B.

    A : REPLACE OVERHEAD J/B 

    B : Go to step 3 

    C : Go to step  5

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

  3. INSPECT REAR DOME LIGHT ASSEMBLY (REAR SEAT ILLUMINATION) 
    1. Remove the rear dome light assembly.
    2. Connect the (+) lead from the battery to terminal 2 and the (-) lead to terminal 5, and then check that the seat illumination comes on.
    Fig 2: Identifying Rear Dome Light Assembly Connector Terminal
    G04049450Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    OK: 

    Seat illumination comes on. 

    NG : REPLACE REAR DOME LIGHT ASSEMBLY 

    OK: Go To Next Step 

  4. CHECK HARNESS AND CONNECTOR (OVERHEAD J/B - REAR DOME LIGHT ASSEMBLY) 
    1. Disconnect the R8 rear dome light assembly connector.
    2. Disconnect the R5 overhead J/B connector.
    3. Measure the resistance according to the value(s) in the table below.

    Standard resistance 

    SPECIFIED CONDITION AND TESTER CONNECTION

    Tester Connection Condition Specified Condition
    R8-2 (ILLB) - R5-4 (ILLB) Always Below 1 Ω
    R8-5 (LILL)- R5-32 (LILL) Always Below 1 Ω
    R8-2 (ILLB) - Body ground Always 10 kΩ or higher
    R8-5 (LILL) - Body ground Always 10 kΩ or higher
    Fig 3: Identifying R5 Overhead J/B Connector
    G04049451Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : REPLACE OVERHEAD J/B 

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

    Standard voltage 

    SPECIFIED CONDITION AND TESTER CONNECTION

    Tester Connection Condition Specified Condition
    Q3-3 (LGCY) - Body ground Always 10 to 14 V
    Fig 4: Identifying Q3 Main Body ECU LH Connector
    G04049452Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    NG : Go to step 6 

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

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

    Standard resistance 

    SPECIFIED CONDITION AND TESTER CONNECTION

    Tester Connection Condition Specified Condition
    Q3-3 (LGCY) - R5-12 (CTY) Always Below 1 Ω
    Q3-3 (LGCY) - Body ground Always 10 kΩ or higher
    Fig 5: Identifying Q3 Main Body ECU LH Connector
    G04049453Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : REPLACE OVERHEAD J/B 

  7. CHECK HARNESS AND CONNECTOR (POWER SOURCE) 
    1. Disconnect the R5 overhead J/B connector.
    2. Measure the voltage according to the value(s) in the table below.

    Standard voltage 

    SPECIFIED CONDITION AND TESTER CONNECTION

    Tester Connection Condition Specified Condition
    R5-1 (+B1) - Body ground Always 10 to 14 V
    Fig 6: Identifying R5 Overhead J/B Connector
    G04049454Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : REPLACE OVERHEAD J/B 

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