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Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
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 radio receiver, steering pad switch, glove box, cigarette lighter or others (seat heater switch, console box, etc.) comes on when the light control switch is turned to the HEAD or TAIL position.

      Result 

      RESULT TABLE

      Result Proceed to
      Illumination comes on for all components except steering pad switch. A
      Illumination comes on for all components except radio receiver. B
      No illumination comes on (radio receiver, glove box, cigarette lighter, steering pad switch, etc.). C
      Illumination comes on only for glove box 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 SPECIFIED CONDITION TABLE

      Tester connection Condition Specified condition
      IL+2 - Body ground Light control SW TAIL or HEAD 10 to 14 V
      Fig 1: Identifying C13 Connector Terminals
      G05270594Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: GO TO  COMBINATION METER SYSTEM 

    OK: Go to Next step 

  3. INSPECT STEERING PAD SWITCH LH 
    1. Disconnect the steering pad switch connector.
      Fig 2: Identifying Steering Pad Switch LH
      G05270595Courtesy 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 connector.
    3. Check if the illumination for the steering pad switch comes on.

      OK: Illumination for the steering pad switch comes on. 

    NG: REPLACE STEERING PAD SWITCH LH 

    OK: Go to Next step 

  4. INSPECT SPIRAL CABLE 
    1. Disconnect the steering pad switch and spiral cable connectors.
      Fig 3: Identifying Steering Pad Switch & Spiral Cable Connectors
      G05270596Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      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 page shown in the brackets.

      HINT:

    NG: REPLACE SPIRAL CABLE 

    OK: Go to Next step 

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

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester connection Condition Specified condition
      SWG - EAU Always Below 1 Ω
      SWG - Body ground Always 10 kΩ or higher
      Fig 4: Identifying Harness & Connector (Spiral Cable - Radio Receiver)
      G05270597Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE RADIO RECEIVER 

  6. CHECK HARNESS AND CONNECTOR (BATTERY - RADIO RECEIVER) 
    1. Disconnect the radio receiver connector R2.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester connection Condition Specified condition
      ILL+ - Body ground Light control switch TAIL or HEAD 10 to 14 V
      Fig 5: Identifying Harness & Connector (Battery - Radio Receiver)
      G05270598Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next step 

  7. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMBINATION METER) 
    1. Disconnect the radio receiver connector R2 and combination meter connector C8.
      Fig 6: Identifying Harness & Connector (Radio Receiver - Combination Meter)
      G05270599Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester connection Condition Specified condition
      ILL- - C8-2 Always Below 1 Ω
      ILL- - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE RADIO RECEIVER 

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