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On-Vehicle Inspection

  1. CHECK STEREO COMPONENT AMPLIFIER CIRCUIT 
    1. Disconnect the S18 amplifier connector.
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      S18-12 (E) -Body ground Below 1 Ω
      S18-13 (GND2) - Body ground Below 1 Ω
    3. Measure the voltage of the wire harness side connector.

    Standard voltage 

    TESTER CONNECTION AND SPECIFIED CONDITION CHART

    Tester Connection Specified Condition
    S18-7 (+B) - Body ground 10 to 14 V
    S18-16 (+B2) - Body ground 10 to 14 V
    Fig 1: Identifying S18 Amplifier Connector
    G04065304Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If the results are not as specified, there may be a malfunction on the wire harness side.

  2. CHECK STEREO COMPONENT CONTROLLER ASSEMBLY CIRCUIT 
    1. Disconnect the R39 controller connector.
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      R39-17 (GND) - Body ground Below 1 Ω
    3. Measure the voltage of the wire harness side connector.

    Standard voltage 

    TESTER CONNECTION AND SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    R39-24 (ACC) - Body ground Ignition switch OFF, radio receiver switch ON Below 1 V
    R39-24 (ACC) - Body ground Ignition switch ACC or ON, radio receiver switch ON 10 to 14 V
    R39-12 (+B) - Body ground Always 10 to 14 V
    Fig 2: Identifying R39 Controller Connector
    G04065305Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If the results are not as specified, there may be a malfunction on the wire harness side.

  3. CHECK DISC PLAYER CHANGER CIRCUIT (w/ NAVIGATION SYSTEM) 
    1. Disconnect the D32 changer connector.
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      D32-20 (GND) - Body ground Below 1 Ω
    3. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      D32-1 (ACC) - Body ground Ignition switch OFF Below 1 V
      D32-1 (ACC) - Body ground Ignition switch ACC or ON 10 to 14 V
      D32-10 (+B) - Body ground Always 10 to 14 V
      Fig 3: Identifying D32 Changer Connector
      G04065306Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If the results are not as specified, there may be a malfunction on the wire harness side.

  4. CHECK RADIO RECEIVER ASSEMBLY CIRCUIT 
    1. Disconnect the R37 receiver connector.
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      R37-20 (GND) - Body ground Below 1 Ω
    3. Measure the voltage of the wire harness side connector.

    Standard voltage 

    TESTER CONNECTION AND SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    R37-1 (BU) - Body ground Always 10 to 14 V
    R37-11 (ACC) - Body ground Ignition switch OFF Below 1 V
    R37-11 (ACC) - Body ground Ignition switch ON 10 to 14 V

    If the results are not as specified, there may be a malfunction on the wire harness side.

    HINT:

    Check the wire harness between radio receiver assembly and disc player changer, between radio receiver assembly and stereo component amplifier.

    Fig 4: Identifying R37 Receiver Connector
    G04065307Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. CHECK STEERING PAD SWITCH 
    1. Disconnect the C20 switch connector.
    2. Measure the resistance of the switch.

    Standard resistance 

    TESTER CONNECTION AND SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    C20-12 (AU1) - C20-10 (EAU) Not pushed Approx. 100 kΩ
    C20-12 (AU1) - C20-10 (EAU) SEEK+ switch pushed Below 1 Ω
    C20-12 (AU1) - C20-10 (EAU) SEEK- switch pushed Approx. 0.3 kΩ
    C20-12 (AU1) - C20-10 (EAU) VOL+ switch pushed Approx. 1 kΩ
    C20-12 (AU1) - C20-10 (EAU) VOL- switch pushed Approx. 3.2 kΩ
    C20-11 (AU2) - C20-10 (EAU) Not pushed Approx. 100 kΩ
    C20-11 (AU2) - C20-10 (EAU) MODE switch pushed Below 1 Ω

    If the result is not as specified, the switch may have a malfunction.

    Fig 5: Checking Steering Pad Switch
    G04065308Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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