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Illumination Circuit: Wiring Diagram

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.
Fig 1: Illumination Circuit - Wiring Diagram
G04050468Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE: The vehicle is equipped with an SRS (Supplemental Restraint System) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precautionary notice for the Supplemental Restraint System (See AIRBAG SYSTEM ).
  1. CHECK ILLUMINATION 
    1. Check if the illumination for the multi-display, steering pad switch assembly, cigarette lighter, or others (seat heater switch, hazard switch, etc.) comes on when the light control switch is turned to the HEAD or TAIL position.
    RESULT

    Condition Proceed to
    Illumination comes on for all components except steering pad switch. A
    Illumination comes on for all components except multi-display. B
    No illumination comes on (radio receiver, hazard switch cigarette lighter, etc.) C
    Illumination comes on only for cigarette lighter and steering pad switch. D

    B: GO TO STEP   6 

    C: GO TO  LIGHTING SYSTEM 

    D: GO TO COMBINATION METER SYSTEM 

    A: Go to next step. 

  2. CHECK HARNESS AND CONNECTOR (BATTERY - SPIRAL CABLE) 
    1. Disconnect the spiral cable connector.
    2. Measure the voltage according to the value(s) in the table below.
      STANDARD VOLTAGE

      Tester connection Condition Specified condition
      IL+2 - Body ground Light control SW TAIL or HEAD 10 to 14 V
    Fig 2: Identifying Terminals Of Spiral Cable Connector
    G04050469Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step. 

  3. CHECK STEERING PAD SWITCH ASSEMBLY 
    1. Disconnect the steering pad switch assembly connector.
      Fig 3: Identifying Steering Pad Switch Assembly Connector
      G04050470Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the positive (+) lead to terminal IL+2 and the negative (-) lead to terminal EAU of the steering pad switch assembly connector.
    3. Check if the illumination for the steering pad switch assembly comes on.

      OK: Illumination for the steering pad switch assembly comes on. 

    NG: REPLACE STEERING PAD SWITCH ASSEMBLY 

    OK: Go to next step. 

  4. CHECK SPIRAL CABLE 
    1. Disconnect the steering pad switch assembly and spiral cable connectors.
    2. Measure the resistance according to the value(s) in the table below.
      STANDARD RESISTANCE

      Tester Connection Spiral Cable Position Specified Condition
      EAU - EAU Center Below 1 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      IL+2 - IL+2 Center Below 1 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      NOTE: The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Be sure to read the example shown in the brackets (See REMOVAL ).
    Fig 4: Identifying Terminals Of Steering Pad Switch Assembly And Spiral Cable Connectors
    G04050471Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE SPIRAL CABLE 

    OK: Go to next step. 

  5. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - RADIO RECEIVER) 
    1. Disconnect the radio receiver and spiral cable connectors.
    2. Measure the resistance according to the value(s) in the table below.
      STANDARD RESISTANCE

      Tester connection Condition Specified condition
      SWG - EAU Always Below 1 Ω
      SWG - Body ground Always 10 kΩ or higher
    Fig 5: Identifying Radio Receiver And Spiral Cable Connectors
    G04050472Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE RADIO RECEIVER 

  6. CHECK HARNESS AND CONNECTOR (BATTERY - MULTI-DISPLAY) 
    1. Disconnect the multi-display connector J50.
    2. Measure the voltage according to the value(s) in the table below.
      STANDARD VOLTAGE

      Tester connection Condition Specified condition
      ILL+ - Body ground Light control switch TAIL or HEAD 10 to 14 V
    Fig 6: Identifying Multi-Display Connector J50
    G04050473Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step. 

  7. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - COMBINATION METER) 
    1. Disconnect the multi-display and combination meter connectors.
    2. Measure the resistance according to the value(s) in the table below.
      STANDARD RESISTANCE

      Tester connection Condition Specified condition
      ILL- - ILL- Always Below 1 Ω
      ILL- - Body ground Always 10 kΩ or higher
    Fig 7: Identifying Multi-Display And Combination Meter Connectors
    G04050474Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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