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Home >> Lexus >> 2014 >> IS 250 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> Navigation System - Symptom Tests (2 Of 2) & Circuit Tests >> Navigation System >> Microphone Circuit between Microphone and Navigation Receiver Assembly [04/2013 - 09/2018] >> Procedure

Microphone Circuit between Microphone and Navigation Receiver Assembly [04/2013 - 09/2018]: Procedure

  1. CHECK MICROPHONE (OPERATION CHECK) 
    1. Enter the "Microphone Check" screen. Refer to Check Microphone in Operation Check.
      GTY434237Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Refer to OPERATION CHECK [04/2013 - 09/2020]

    2. When a voice is input into the microphone, check that the microphone input level meter changes according to the input voice.
    3. Push the recording switch and perform voice recording.

      HINT: 

      • Select the recording switch with the blower motor of the air conditioning system stopped. If an outlet of the air conditioning system is facing the microphone, noise may be recorded.
      • Voice can be recorded for up to 5 seconds.
    4. Check that the recording indicator remains on while recording and that the recorded voice is played normally without noise or distortion.

      OK

      All check results are normal.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  REMOVAL [04/2013 - 09/2020] 

    Result: 

    NG 

    See step  2

  2. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      w/o Manual (SOS) Switch A
      w/ Manual (SOS) Switch B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)) 
    1. Disconnect the K58 radio receiver assembly connector.
    2. Disconnect the S4 map light assembly (telephone microphone assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K58-49 (SNS2) - S4-1 (SNS2) Always Below 1 Ω
      K58-29 (MACC) - S4-4 (MACC) Always Below 1 Ω
      K58-27 (MIN+) - S4-3 (MCO+) Always Below 1 Ω
      K58-48 (MIN-) - S4-2 (MCO-) Always Below 1 Ω
      K58-49 (SNS2) - Body ground Always 10 kΩ or higher
      K58-29 (MACC) - Body ground Always 10 kΩ or higher
      K58-27 (MIN+) - Body ground Always 10 kΩ or higher
      K58-48 (MIN-) - Body ground Always 10 kΩ or higher
      K58-28 (SGND) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. INSPECT RADIO RECEIVER ASSEMBLY 
    1. Reconnect the K58 radio receiver assembly connector.
    2. Reconnect the S4 map light assembly (telephone microphone assembly) connector.
    3. Measure the voltage according to the value(s) in the table below.
      GTY456159Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Radio Receiver Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      K58-29 (MACC) - Body ground Engine switch on (ACC) 4 to 6 V
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K58-28 (SGND) - Body ground Always Below 1 Ω
      K58-48 (MIN-) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  10

    Result: 

    NG 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [04/2013 - 09/2020] 

  5. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)) 
    1. Disconnect the K58 radio receiver assembly connector.
    2. Disconnect the S4 map light assembly (telephone microphone assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K58-49 (SNS2) - S4-1 (SNS2) Always Below 1 Ω
      K58-49 (SNS2) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER)) 
    1. Disconnect the K58 radio receiver assembly connector.
    2. Disconnect the K66 DCM (telematics transceiver) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K58-27 (MIN+) - K66-18 (MCO+) Always Below 1 Ω
      K58-48 (MIN-) - K66-19 (MCO-) Always Below 1 Ω
      K58-27 (MIN+) - Body ground Always 10 kΩ or higher
      K58-48 (MIN-) - Body ground Always 10 kΩ or higher
      K58-28 (SGND) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)) 
    1. Disconnect the K66 DCM (telematics transceiver) connector.
    2. Disconnect the S4 map light assembly (telephone microphone assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K66-33 (MCVD) - S4-4 (MACC) Always Below 1 Ω
      K66-34 (MCI+) - S4-3 (MCO+) Always Below 1 Ω
      K66-35 (MCI-) - S4-2 (MCO-) Always Below 1 Ω
      K66-33 (MCVD) - Body ground Always 10 kΩ or higher
      K66-34 (MCI+) - Body ground Always 10 kΩ or higher
      K66-35 (MCI-) - Body ground Always 10 kΩ or higher
      K66-32 (SGND) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. INSPECT RADIO RECEIVER ASSEMBLY 
    1. Disconnect the K66 DCM (telematics transceiver) connector.
    2. Reconnect the K58 radio receiver assembly connector.
      GTY468538Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Radio Receiver Assembly)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K58-28 (SGND) - Body ground Always Below 1 Ω
      K58-48 (MIN-) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [04/2013 - 09/2020] 

    Result: 

    OK 

    See step  9

  9. INSPECT DCM (TELEMATICS TRANSCEIVER) 
    1. Reconnect the K66 DCM (telematics transceiver) connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY463561Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (DCM (Telematics Transceiver))

      Standard Voltage

      Tester Connection Condition Specified Condition
      K66-33 (MCVD) - Body ground Engine switch on (ACC) 4 to 6 V
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K66-35 (MCI-) - Body ground Always Below 1 Ω
      K66-32 (SGND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [04/2013 - 10/2017]  , or refer to  REMOVAL [10/2017 - 09/2020] 

    Result: 

    OK 

    See step  10

  10. INSPECT MAP LIGHT ASSEMBLY 
    1. Remove the map light assembly (telephone microphone assembly).

      Refer to REMOVAL [04/2013 - 09/2018]

    2. Measure the resistance according to the value(s) in the table below.
      GTY467808Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Map Light Assembly (Telephone Microphone Assembly))

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (SNS2) - 2 (MCO-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  12

    Result: 

    OK 

    See step  11

  11. INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) 
    1. Reconnect the K58 radio receiver assembly connector.
    2. Reconnect the S4 map light assembly (telephone microphone assembly) connector.
    3. Reconnect the K66 DCM (telematics transceiver) connector (w/ Manual (SOS) Switch).
    4. Turn the engine switch on (ACC).
    5. Connect an oscilloscope to terminals 3 (MCO+) and 2 (MCO-) of the S4 map light assembly (telephone microphone assembly) connector.
      GTY461550Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Map Light Assembly (Telephone Microphone Assembly))
    6. Check the waveform of the map light assembly (telephone microphone assembly) using the oscilloscope.

      Result

      Result Proceed to
      A waveform synchronized with the voice input to the map light assembly (telephone microphone assembly) is output A
      A waveform synchronized with the voice input to the map light assembly (telephone microphone assembly) is not output B

    Result: 

    A 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  REMOVAL [04/2013 - 09/2020] 

    Result: 

    B 

    See step  12

  12. REPLACE TELEPHONE MICROPHONE ASSEMBLY 
    1. Replace the telephone microphone assembly.

      Refer to REMOVAL [04/2013 - 09/2018]

    2. Check if the same malfunction recurs.

      Result

      Result Proceed to
      Malfunction does not recur (returns to normal) A
      Malfunction recurs B

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE MAP LIGHT ASSEMBLY. Refer to  REMOVAL [04/2013 - 09/2018] 

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