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Home >> Lexus >> 2018 >> NX 300h >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Audio / Video System (Except 8 Speakers) - Circuit Tests & Symptom Tests >> AUDIO AND VISUAL SYSTEM (except 8 Speakers) >> Microphone Circuit between Microphone and Radio Receiver [10/2014 - 09/2017] >> Procedure

Microphone Circuit between Microphone and Radio Receiver [10/2014 - 09/2017]: Procedure

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

      Refer to OPERATION CHECK [10/2014 - 09/2017]

    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 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [10/2014 - 09/2017] 

    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  8

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY) 
    1. Disconnect the I38 radio receiver assembly connector.
    2. Disconnect the T7 map light assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I38-49 (SNS2) - T7-1 (SNS2) Always Below 1 Ω
      I38-29 (MACC) - T7-4 (MACC) Always Below 1 Ω
      I38-27 (MIN+) - T7-3 (MCO+) Always Below 1 Ω
      I38-48 (MIN-) - T7-2 (MCO-) Always Below 1 Ω
      I38-28 (SGND) - Body ground Always 10 kΩ or higher
      I38-49 (SNS2) or T7-1 (SNS2) - Body ground Always 10 kΩ or higher
      I38-29 (MACC) or T7-4 (MACC) - Body ground Always 10 kΩ or higher
      I38-27 (MIN+) or T7-3 (MCO+) - Body ground Always 10 kΩ or higher
      I38-48 (MIN-) or T7-2 (MCO-) - 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. CHECK RADIO RECEIVER ASSEMBLY 
    1. Remove the radio receiver assembly with the connector still connected.
      GTY506461Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Radio Receiver Assembly)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I38-28 (SGND) - Body ground Always Below 1 Ω
      I38-48 (MIN-) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      I38-29 (MACC) - Body ground Power switch on (ACC) 4 to 6 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [10/2014 - 09/2017] 

    Result: 

    OK 

    See step  5

  5. INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) 
    1. Remove the map light assembly (telephone microphone assembly).

      Refer to REMOVAL [10/2014 - ]

      GTY516096Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

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

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  6

  6. CHECK MAP LIGHT ASSEMBLY 
    1. Reconnect the radio receiver assembly connector.
      GTY500772Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Map Light Assembly)
    2. Reconnect the map light assembly connector.
    3. Turn the power switch on (ACC).
    4. Connect an oscilloscope to terminals T7-3 (MCO+) and T7-2 (MCO-) of the map light assembly connector.
    5. Check the waveform of the telephone microphone assembly using the oscilloscope.

      Result

      Result Proceed to
      A waveform synchronized with the voice input to the map light assembly is not output. A
      A waveform synchronized with the voice input to the map light assembly is output. B

    Result: 

    B 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2014 - 09/2016]  , or refer to  PROBLEM SYMPTOMS TABLE [09/2016 - 09/2017] 

    Result: 

    A 

    See step  7

  7. CHECK TELEPHONE MICROPHONE ASSEMBLY 
    1. Replace the telephone microphone assembly.

      Refer to REMOVAL [10/2014 - 09/2017]

    2. Check if the same malfunction recurs.

      OK

      Malfunction does not recur (returns to normal).

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE) 

    Result: 

    NG 

    REPLACE MAP LIGHT ASSEMBLY. Refer to  REMOVAL [10/2014 - ] 

  8. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY) 
    1. Disconnect the I38 radio receiver assembly connector.
    2. Disconnect the T7 map light assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I38-49 (SNS2) - T7-1 (SNS2) Always Below 1 Ω
      I38-49 (SNS2) or T7-1 (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  9

  9. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - DCM [TELEMATICS TRANSCEIVER]) 
    1. Disconnect the I38 radio receiver assembly connector.
    2. Disconnect the I40 DCM (telematics transceiver) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I38-27 (MIN+) - I40-18 (MCO+) Always Below 1 Ω
      I38-48 (MIN-) - I40-19 (MCO-) Always Below 1 Ω
      I38-28 (SGND) - Body ground Always 10 kΩ or higher
      I38-27 (MIN+) or I40-18 (MCO+) - Body ground Always 10 kΩ or higher
      I38-48 (MIN-) or I40-19 (MCO-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - MAP LIGHT ASSEMBLY) 
    1. Disconnect the I40 DCM (telematics transceiver) connector.
    2. Disconnect the T7 map light assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I40-33 (MCVD) - T7-4 (MACC) Always Below 1 Ω
      I40-34 (MCI+) - T7-3 (MCO+) Always Below 1 Ω
      I40-35 (MCI-) - T7-2 (MCO-) Always Below 1 Ω
      I40-32 (SGND) - Body ground Always 10 kΩ or higher
      I40-33 (MCVD) or T7-4 (MACC) - Body ground Always 10 kΩ or higher
      I40-34 (MCI+) or T7-3 (MCO+) - Body ground Always 10 kΩ or higher
      I40-35 (MCI-) or T7-2 (MCO-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK RADIO RECEIVER ASSEMBLY 
    1. Remove the radio receiver assembly with the connector still connected.
      GTY519465Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Radio Receiver Assembly)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I38-28 (SGND) - Body ground Always Below 1 Ω
      I38-48 (MIN-) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [10/2014 - 09/2017] 

    Result: 

    OK 

    See step  12

  12. CHECK DCM (TELEMATICS TRANSCEIVER) 
    1. Remove the DCM (telematics transceiver) with the connector still connected.
      GTY511281Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (DCM [Telematics Transceiver])
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I40-32 (SGND) - Body ground Always Below 1 Ω
      I40-35 (MCI-) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      I40-33 (MCVD) - Body ground Power switch on (ACC) 4 to 6 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  5

    Result: 

    NG 

    REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [10/2014 - 09/2017] 

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