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Inspection Procedure

  1. CHECK MICROPHONE 
    1. Check the waveform of the microphone using an oscilloscope.

      Measurement Condition 

    CONDITION OF MEASUREMENT

    Item Content
    Terminal No. (Symbol) R7-27 (MI1+) - R7-26 (MIC-)
    Tool Setting 0.2 V/DIV., 0.2 /DIV.
    Condition Engine switch on (ACC), and "Voice" switch of steering pad switch pressed

    OK: Waveform that matches sound spoken into microphone is output. 

    Fig 1: Identifying R7 Connector Terminal
    G05630780Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  4

    OK: Go to Next Step 

  2. CHECK HARNESS AND CONNECTOR (MAP LIGHT - MULTI-DISPLAY) 
    1. Disconnect the R7 map light connector.
    2. Disconnect the F27 display connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

    RESISTANCE REFERENCE

    Tester Connection Condition Specified Condition
    F27-9 (MACC) - R7-25 (ACC) Always Below 1 Ω
    F27-11 (MIN+) - R7-27 (MI1+) Always Below 1 Ω
    F27-10 (MIN-) - R7-26 (MIC-) Always Below 1 Ω
    F27-9 (MACC) - Body ground Always 10 kΩ or higher
    F27-11 (MIN+) - Body ground Always 10 kΩ or higher
    F27-10 (MIN-) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Identifying R7 Map Light Connector & F27 Display Connector
    G05630781Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  3. CHECK MULTI-DISPLAY (MACC VOLTAGE) 
    1. Reconnect the F27 display connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

    VOLTAGE SPECIFICATION

    Tester Connection Switch Condition Specified Condition
    F27-9 (MACC) - Body ground Engine switch on (ACC) 4 to 6 V

    NG: REPLACE MULTI-DISPLAY  (See MULTI-DISPLAY (W/NAVIGATION SYSTEM)  )

    Fig 3: Identifying F27 Display Connector
    G05630782Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

  4. CHECK MICROPHONE ASSEMBLY 
    1. Remove the microphone from the map light.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

    RESISTANCE REFERENCE

    Tester Connection Condition Specified Condition
    1 (MIC+) - 3 (MIC-) Always 1.9 to 2.2 kΩ

    NG: REPLACE MICROPHONE ASSEMBLY  (See REMOVAL )

    Fig 4: Identifying Microphone Connector Terminal
    G05630783Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE MAP LIGHT ASSEMBLY  (See REMOVAL )

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