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Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus GX 470. 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 the airbags. Before servicing (including removal or installation of parts), be sure to read the PRECAUTION in the Supplemental Restraint System article.
  1. CHECK ILLUMINATION 
    1. Check if the illumination for the steering pad switch, radio receiver, glove box, or others (hazard switch, cigarette lighter, etc.) comes on when the light control switch is turned to the HEAD or TAIL position.

      Result 

      ILLUMINATION RESULT TABLE

      Result Proceed to
      Illumination comes on for all components except radio receiver A
      Illumination comes on for all components except steering pad switch B
      No illumination comes on C

    B: Go to step   4 

    C: GO TO  LIGHTING SYSTEM 

    A: Go to Next step 

  2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - BATTERY) 
    Fig 1: Identifying R1 Receiver Connector Terminals
    G05266130Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the R1 receiver connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      RADIO RECEIVER - BATTERY

      Tester Connection Switch Condition Specified Condition
      R1-2 (ILL+) - Body ground Light control switch OFF Below 1 V
      R1-2 (ILL*) - Body ground Light control switch TAIL or HEAD 11 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go To Next Step 

  3. CHECK HARNESS AND CONNECTOR (RHEOSTAT - RADIO RECEIVER AND BODY GROUND) 
    Fig 2: Identifying R12 & R1 Connector Terminals
    G05266131Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the R12 rheostat connector.
    2. Disconnect the R1 receiver connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RHEOSTAT - RADIO RECEIVER AND BODY GROUND

      Tester Connection Condition Specified Condition
      R12-6 (ILL-) - R1-12 (ILL-) Always Below 1 Ω
      R12-6 (ILL-) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

  4. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - RADIO RECEIVER AND BATTERY) 
    Fig 3: Identifying R2 & C13 Connector Terminals
    G05266132Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C13 cable connector.
    2. Disconnect the R2 receiver connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      SPIRAL CABLE - RADIO RECEIVER AND BATTERY RESISTANCE

      Tester Connection Condition Specified Condition
      C13-10 (EAU) - R2-6 (SWGND) Always Below 1 Ω
      C13-10 (EAU) - Body ground Always 10 kΩ or higher
    4. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      SPIRAL CABLE - RADIO RECEIVER AND BATTERY VOLTAGE

      Tester Connection Switch Condition Specified Condition
      C13-1 (ILL+) - Body ground Light control switch TAIL or HEAD 11 to 14 V
      C13-1 (ILL+) - Body ground Light control switch OFF Below 1 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go To Next Step 

  5. INSPECT STEERING PAD SWITCH 
    Fig 4: Identifying Steering Pad Switch
    G05266133Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A switch connector.
    2. Connect the positive (+) lead to terminal ILL+ (A-1) and the negative (-) lead to terminal EAU (A-10) of the steering pad switch connector.
    3. Check if the illumination for the steering pad switch comes on.

      Result 

      STEERING PAD SWITCH RESULT TABLE

      Result Proceed to
      Illumination comes on for the steering pad switch LH and RH. A
      Illumination comes on only for the steering pad switch LH. B
      Illumination comes on only for the steering pad switch RH. C

    B: Go to step   7 

    C: REPLACE STEERING PAD SWITCH 

    A: Go to Next step 

  6. INSPECT SPIRAL CABLE 
    Fig 5: Identifying C13 & A Cable Connector Terminals
    G05266134Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C13 and A cable connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      SPIRAL CABLE

      Tester Connection Spiral Cable Position Specified Condition
      C13-10 (EAU) - A-10 (EAU) Center Below 1 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      C13-1 (ILL+) - A-1 (ILL+) 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 PRECAUTION for the supplemental restraint system article.

    NG: REPLACE SPIRAL CABLE 

    OK: REPLACE RADIO RECEIVER 

  7. INSPECT STEERING PAD SWITCH CABLE 
    Fig 6: Identifying Steering Pad Switch Cable
    G04966987Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the steering pad switch LH and steering pad RH.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      STEERING PAD SWITCH CABLE

      Tester Connection Condition Specified Condition
      LH-1 - RH-1 Always Below 1 Ω
      LH-2 - RH-2 Always Below 1 Ω
      LH-3 - RH-3 Always Below 1 Ω
      LH-4 - RH-4 Always Below 1 Ω
      LH-5 - RH-5 Always Below 1 Ω
      LH-6 - RH-6 Always Below 1 Ω
      LH-7 - RH-7 Always Below 1 Ω
      LH-8 - RH-8 Always Below 1 Ω
      LH-1 - Body ground Always 10 kΩ or higher
      LH-2 - Body ground Always 10 kΩ or higher
      LH-3 - Body ground Always 10 kΩ or higher
      LH-4 - Body ground Always 10 kΩ or higher
      LH-5 - Body ground Always 10 kΩ or higher
      LH-6 - Body ground Always 10 kΩ or higher
      LH-7 - Body ground Always 10 kΩ or higher
      LH-8 - Body ground Always 10 kΩ or higher

    NG: REPLACE STEERING PAD SWITCH CABLE 

    OK: REPLACE STEERING PAD SWITCH RH 

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