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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 INSPECTION ).
  1. INSPECT RADIO RECEIVER 
    1. Disconnect the radio receiver connector R4 or R9.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester connection Condition Specified condition
      SW1 - SWG No switch is pushed Approx. 100 kΩ
      SW1-SWG SEEK+ switch: push Approx. 0 Ω
      SW1 - SWG SEEK- switch: push Approx. 0.3 kΩ
      SW1 - SWG VOL+ switch: push Approx. 1 kΩ
      SW1-SWG VOL- switch: push Approx. 3.2 kΩ
      SW2-SWG No switch is pushed Approx. 100 kΩ
      SW2-SWG MODE switch: push Approx. 0 Ω

      *1: 10 Speaker without Navigation System

      *2: 6 Speaker with Rear Seat Entertainment System

      *3: 6 Speaker without Rear Seat Entertainment System

      3. Fig 1: Identifying R4 Or R9 Radio Receiver Connector Terminal
      G05141058Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step 2 

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

  2. INSPECT STEERING PAD SWITCH ASSEMBLY 
    1. Disconnect the steering pad switch LH connector.
    2. Measure the resistance according to the values in the table below.
      Fig 2: Measuring Steering Pad Switch LH Resistance
      G04966684Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester connection Condition Specified condition
      AU1-EAU No switch is pushed Approx. 100 kΩ
      AU1-EAU SEEK+ switch: push Approx. 0 Ω
      AU1-EAU SEEK- switch: push Approx. 0.3 kΩ
      AU1-EAU VOL+ switch: push Approx. 1 kΩ
      AU1-EAU VOL-switch: push Approx. 3.2 kΩ
      AU2-EAU No switch is pushed Approx. 100 kΩ
      AU2-EAU MODE switch: push Approx. 0 Ω

    NG: REPLACE STEERING PAD SWITCH ASSEMBLY 

    OK: Go to next step 

  3. INSPECT SPIRAL CABLE 
    1. Disconnect the steering pad switch and spiral cable connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      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
      AU1-AU1 Center Below 1 Ω
      2.5 rotations to the left
      2.5 rotations to the right
      AU2-AU2 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 procedure shown in the brackets (See INSPECTION ).
      3. Fig 3: Identifying Steering Pad Switch And Spiral Cable Connectors Terminal EAU, AU2 And AU1
      G05141060Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE SPIRAL CABLE 

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE - RADIO RECEIVER) 

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