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Home >> Lexus >> 2008 >> IS F >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Navigation >> Navigation System >> Illumination Circuit >> Inspection Procedure

Inspection Procedure

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 PRECAUTION ).
  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 

      RESULT CHART

      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  (See PROBLEM SYMPTOMS TABLE )

    D: GO TO METER / GAUGE SYSTEM  (See PROBLEM SYMPTOMS TABLE )

    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 SPECIFIED CONDITION

      Tester Connection Switch Condition Specified Condition
      J24-12 (IL+2) - Body ground Light control switch TAIL or HEAD 11 to 14 V
      3. Fig 1: Identifying Terminals Of Spiral Cable Connector
      G05753334Courtesy 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 2: Identifying Terminals Of Steering Pad Switch Assembly Connector
      G05753689Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect a positive (+) lead to terminal IL+2 and a 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  (See REMOVAL )

    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 SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      k1-8 (EAU) - J24-4 (EAU) Center Below 1 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      k1-5 (IL+2) - J24-12 (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 deploy the airbag. Be sure to read the article shown in the bracket (See PRECAUTION ).
      3. Fig 3: Identifying Terminals Of Spiral Cable Connector
      G05753336Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE SPIRAL CABLE  (See REMOVAL )

    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 SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      J63-6 (SWG) - J24-4 (EAU) Always Below 1 Ω
      J63-6 (SWG) - Body ground Always 10 kΩ or higher
      3. Fig 4: Identifying Terminals Of Radio Receiver And Spiral Cable Connector
      G05753691Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE RADIO RECEIVER  (See REMOVAL )

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

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Switch Condition Specified Condition
      J50-12 (ILL+) - Body ground Light control switch TAIL or HEAD 11 to 14 V
      3. Fig 5: Identifying Terminals Of Multi-Display Connector
      G05753692Courtesy 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.
      Fig 6: Identifying Terminals Of Multi-Display Connector
      G05753693Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      J50-11 (ILL-) - J35-9 (ILL-) Always Below 1 Ω
      J50-11 (ILL-) - Body ground Always 10 kΩ or higher
      3. Fig 7: Identifying Terminals Of Combination Meter Connector
      G05753341Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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