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Rear Room Light Assembly: Inspection

WARNING: This page is about a different car, the 2006 Lexus IS 350 and 2006 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT REAR ROOM LIGHT (PERSONAL LIGHT) 
    1. Disconnect the R8 connector from the rear room light.
    2. Measure the resistance of the connector.

      Standard resistance 

      SPECIFIED CONDITION AND TESTER CONNECTION

      Tester Connection Condition Specified Condition
      R8-3 (RGND) - Body ground Always Below 1 Ω
    3. Measure the voltage of the connector.

      Standard voltage 

      SPECIFIED CONDITION AND TESTER CONNECTION

      Tester Connection Condition Specified Condition
      R8-1 (RRMP) - Body ground Always 10 to 14 V
      Fig 1: Identifying R8 Connector From Rear Room Light
      G04049577Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      If the result is not as specified, repair or replace wire harness or connector.

    4. Connect the (+) lead from the battery to terminal 1 and the (-) lead to terminal 3.
    5. Check that the personal light comes on.

    OK 

    SPECIFIED CONDITION REFERENCE

    Condition Specified Condition
    LH side personal light ON LH side personal light comes ON
    LH side personal light OFF LH side personal light does not come ON
    RH side personal light ON RH side personal light comes ON
    RH side personal light OFF RH side personal light does not come ON
    Fig 2: Connecting (+) Lead From Battery To Terminal 1 And (-) Lead To Terminal 3
    G04049578Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    If the result is not as specified, replace the rear room light assembly.

  2. INSPECT REAR ROOM LIGHT (DOME LIGHT) 
    1. Disconnect the R8 connector from the rear room light.
    2. Measure the voltage of the connector.

      Standard resistance 

      SPECIFIED CONDITION AND TESTER CONNECTION

      Tester Connection Condition Specified Condition
      R8-1 (RRMP) - Body ground Always 10 to 14 V
      Fig 3: Identifying R8 Connector From Rear Room Light
      G04049579Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      If the result is not as specified, repair or replace wire harness or connector.

    3. Connect the (+) lead from the battery to terminal 2 and the (-) lead to terminal 4.
    4. Check that the rear interior light comes on.

      OK: 

      Comes on 

      If the result is not as specified, replace the rear room light assembly.

    5. Connect the (+) lead from the battery to terminal 2 and the (-) lead to terminal 5.
    6. Check that the rear seat light comes on.
      Fig 4: Connecting (+) Lead From Battery To Terminal 2 And (-) Lead To Terminal 5
      G04049580Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    OK: 

    Comes on 

    If the result is not as specified, replace the rear room light assembly.

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