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Home >> Lexus >> 2012 >> IS 250C Automatic Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Audio / Video System (W/O Navigation & Multi-Display) (Diagnostic Codes & Symptom Tests) >> AUDIO AND VISUAL SYSTEM (w/o Navigation System without Multi-display) >> Circuit Tests >> Microphone Circuit between Microphone and Radio Receiver >> Procedure

Microphone Circuit between Microphone and Radio Receiver: Procedure

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

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

    B → See step   4 

    A: Go to next step 

  2. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the radio receiver assembly and map light assembly connectors.
    2. Measure the resistance according to the value(s) in the table below.
      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      J97-1 (SNS2) - R5-4 (SNS2) Always Below 1 Ω
      J97-3 (MACC) - R5-7 (MACC) Always Below 1 Ω
      J97-2 (MIC+) - R5-6 (MCO+) Always Below 1 Ω
      J97-5 (MIC-) - R5-5 (MCO-) Always Below 1 Ω
      J97-1 (SNS2) - Body ground Always 10 kΩ or higher
      J97-3 (MACC) - Body ground Always 10 kΩ or higher
      J97-2 (MIC+) - Body ground Always 10 kΩ or higher
      J97-5 (MIC-) - Body ground Always 10 kΩ or higher
      J97-6 (SGND) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. INSPECT RADIO RECEIVER ASSEMBLY 
    1. Disconnect the radio receiver assembly connector.
      Fig 1: J97 Connector Terminal Identification
      GTY280925Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.
      STANDARD VOLTAGE

      Tester Connection Condition Specified Condition
      J97-3 (MACC) - 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
      J97-6 (SGND) - Body ground Always Below 1 Ω
      J97-5 (MIC-) - Body ground Always Below 1 Ω
    4. Proceed to the next step based on the inspection result.
      RESULT

      Result Proceed to
      NG A
      OK B
      TEXT IN ILLUSTRATION

      *1 Component with harness connected
      (Radio Receiver Assembly)

    B → See step   9 

    A → See step   12 

  4. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the radio receiver assembly and map light assembly connectors.
    2. Measure the resistance according to the value(s) in the table below.
      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      J97-1 (SNS2) - R5-4 (SNS2) Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the radio receiver assembly and DCM (telematics transceiver) connectors.
    2. Measure the resistance according to the value(s) in the table below.
      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      J97-2 (MIC+) - J101-18 (MCO+) Always Below 1 Ω
      J97-5 (MIC-) - J101-19 (MCO-) Always Below 1 Ω
      J97-2 (MIC+) - Body ground Always 10 kΩ or higher
      J97-5 (MIC-) - Body ground Always 10 kΩ or higher
      J97-6 (SGND) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the DCM (telematics transceiver) and map light assembly connectors.
    2. Measure the resistance according to the value(s) in the table below.
      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      J101-33 (MCVD) - R5-7 (MACC) Always Below 1 Ω
      J101-34 (MCI+) - R5-6 (MCO+) Always Below 1 Ω
      J101-35 (MCI-) - R5-5 (MCO-) Always Below 1 Ω
      J101-33 (MCVD) - Body ground Always 10 kΩ or higher
      J101-34 (MCI+) - Body ground Always 10 kΩ or higher
      J101-35 (MCI-) - Body ground Always 10 kΩ or higher
      J101-32 (SGND) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. INSPECT RADIO RECEIVER ASSEMBLY 
    1. Disconnect the radio receiver assembly connector.
      Fig 2: J97 Connector Terminal Identification
      GTY280965Courtesy 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
      J97-6 (SGND) - Body ground Always Below 1 Ω
      J97-5 (MIC-) - Body ground Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Component with harness connected
      (Radio Receiver Assembly)

    NG → See step   15 

    OK: Go to next step 

  8. INSPECT DCM (TELEMATICS TRANSCEIVER) 
    1. Reconnect the DCM (telematics transceiver) connector.
    2. Measure the voltage according to the value(s) in the table below.
      Fig 3: J101 Connector Terminal Identification
      GTY279243Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      STANDARD VOLTAGE

      Tester Connection Condition Specified Condition
      J101-33 (MCVD) - Body ground Engine switch on (ACC) 4 to 6 V
      TEXT IN ILLUSTRATION

      *1 Component with harness connected
      (DCM (Telematics Transceiver))

    NG → See step   16 

    OK: Go to next step 

  9. INSPECT MAP LIGHT ASSEMBLY 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 4: Map Light Assembly Connector Terminal Identification
      GTY255776Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      R5-5 (MCO-) - R5-4 (SNS2) Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *1 Component without harness connected
      (Map Light Assembly)

    NG → See step   11 

    OK: Go to next step 

  10. INSPECT MAP LIGHT ASSEMBLY 
    1. Reconnect the radio receiver assembly connector.
    2. Reconnect the DCM (telematics transceiver) connector*1.
      • *1: w/ Manual (SOS) Switch
    3. Reconnect the map light assembly connector.
      Fig 5: R5 Connector Terminal Identification
      GTY280654Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Turn the engine switch on (ACC).
    5. Connect an oscilloscope to terminals 6 (MCO+) and 5 (MCO-) of the R5 map light assembly connector.
    6. 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 output A
      A waveform synchronized with the voice input to the map light assembly is not output B
      TEXT IN ILLUSTRATION

      *1 Component with harness connected
      (Map Light Assembly)

    B → See step   11 

    A → See step   14 

  11. REPLACE TELEPHONE MICROPHONE ASSEMBLY 
    1. Replace the telephone microphone assembly. Refer to REMOVAL .
    2. Check if the same malfunction recurs.
      RESULT

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

    B → See step   13 

    A → END 

  12. REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL 
  13. REPLACE MAP LIGHT ASSEMBLY. Refer to  REMOVAL 
  14. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  15. REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL 
  16. REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL 
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