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DTC B1572-13: Microphone Circuit Open [09/2019 - ]: Procedure

  1. CHECK DTC 
    1. Turn the engine switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the engine switch on (IG) and wait for 10 seconds or more.
    4. Turn the Techstream on.
    5. Clear the DTCs.

      Body Electrical > Telematics > Clear DTCs 

    6. Check for DTCs and check that no DTCs are output.

      Body Electrical > Telematics > Trouble Codes 

      OK

      No DTCs are output.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2019 - 03/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2020 - 10/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 08/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2021 - ] 

    Result: 

    NG 

    See step  2

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

      Result

      Result Proceed to
      w/ Sliding Roof A
      w/o Sliding Roof B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - ROOF CONSOLE BOX SUB-ASSEMBLY) 
    1. Disconnect the K140 DCM (telematics transceiver) connector.
    2. Disconnect the V14 roof console box sub-assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K140-5 (MCVD) - V14-9 (MACC) Always Below 1 Ω
      K140-6 (MCI+) - V14-8 (MCO+) Always Below 1 Ω
      K140-7 (MCI-) - V14-7 (MCO-) Always Below 1 Ω
      K140-23 (SGND) - Body ground Always 10 kΩ or higher
      K140-5 (MCVD) or V14-9 (MACC) - Body ground Always 10 kΩ or higher
      K140-6 (MCI+) or V14-8 (MCO+) - Body ground Always 10 kΩ or higher
      K140-7 (MCI-) or V14-7 (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 DCM (TELEMATICS TRANSCEIVER) (TELEPHONE MICROPHONE ASSEMBLY POWER SOURCE) 
    1. Remove the telephone microphone assembly but do not disconnect the connectors.

      Refer to REMOVAL [09/2019 - ]

      GTY982160Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Roof Console Box Sub-assembly)
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      V14-9 (MACC) - Body ground Engine switch on (ACC) 4 to 6 V

      Standard Resistance

      Tester Connection Condition Specified Condition
      V14-7 (MCO-) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TELEPHONE MICROPHONE ASSEMBLY. Refer to  REMOVAL [09/2019 - ] 

    Result: 

    NG 

    See step  7

  5. CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - ROOF CONSOLE BOX SUB-ASSEMBLY) 
    1. Disconnect the K140 DCM (telematics transceiver) connector.
    2. Disconnect the V18 roof console box sub-assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K140-5 (MCVD) - V18-6 (MACC) Always Below 1 Ω
      K140-6 (MCI+) - V18-5 (MCO+) Always Below 1 Ω
      K140-7 (MCI-) - V18-4 (MCO-) Always Below 1 Ω
      K140-23 (SGND) - Body ground Always 10 kΩ or higher
      K140-5 (MCVD) or V18-6 (MACC) - Body ground Always 10 kΩ or higher
      K140-6 (MCI+) or V18-5 (MCO+) - Body ground Always 10 kΩ or higher
      K140-7 (MCI-) or V18-4 (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  6

  6. CHECK DCM (TELEMATICS TRANSCEIVER) (TELEPHONE MICROPHONE ASSEMBLY POWER SOURCE) 
    1. Remove the roof console box sub-assembly but do not disconnect the connectors.

      Refer to REMOVAL [03/2017 - ]

      GTY752206Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Roof Console Box Sub-assembly)
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      V18-6 (MACC) - Body ground Engine switch on (ACC) 4 to 6 V

      Standard Resistance

      Tester Connection Condition Specified Condition
      V18-4 (MCO-) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TELEPHONE MICROPHONE ASSEMBLY. Refer to  REMOVAL [09/2019 - ] 

    Result: 

    NG 

    See step  7

  7. REPLACE DCM (TELEMATICS TRANSCEIVER) 
    1. Replace the DCM (telematics transceiver) with a new one.

      Refer to REMOVAL [09/2019 - 10/2020] , or refer to REMOVAL [10/2020 - ]

      NOTE:
      • The engine switch must be off
      • Do not exchange the DCM (telematics transceiver) with one from another vehicle.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    PERFORM DCM ACTIVATION. Refer to  DCM ACTIVATION [09/2019 - ] 

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