NAVIGATION SYSTEM, Diagnostic DTC:B1579

DTC Code DTC Name
B1579 Voice Recognition Microphone Disconnected

DESCRIPTION

The radio receiver assembly and map light assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.

This DTC is stored when a microphone connection detection signal line is disconnected.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1579 Voice Recognition Microphone Disconnected Telephone microphone signal is lost.

  • Radio receiver assembly

  • Map light assembly

  • Telephone microphone assembly

  • DCM (Telematics Transceiver) (w/ Telematics Transceiver)

  • Harness or connector

WIRING DIAGRAM

B0057OIE01

CAUTION / NOTICE / HINT

Tech Tips

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.

Click here

PROCEDURE


  1. CONFIRM MODEL


    1. Choose the model to be inspected.

      Model
      Model Proceed to
      w/o Telematics Transceiver A
      w/ Telematics Transceiver B

    B

    CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY) Click here

    A

  2. 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
      I38-27 (MIN+) - T7-3 (MCO+) Always Below 1 Ω
      I38-29 (MACC) - T7-4 (MACC) Always Below 1 Ω
      I38-48 (MIN-) - T7-2 (MCO-) Always Below 1 Ω
      I38-49 (SNS2) - T7-1 (SNS2) Always Below 1 Ω
      I38-27 (MIN+) - Body ground Always 10 kΩ or higher
      I38-28 (SGND) - Body ground Always 10 kΩ or higher
      I38-29 (MACC) - Body ground Always 10 kΩ or higher
      I38-48 (MIN-) - Body ground Always 10 kΩ or higher
      I38-49 (SNS2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK RADIO RECEIVER ASSEMBLY


    1. B005ACWC73
      *a

      Component with harness connected

      (Radio Receiver Assembly)

      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 Engine switch on (ACC) 4 to 6 V

    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

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

  4. INSPECT MAP LIGHT ASSEMBLY


    1. B00586FN12

      Remove the map light assembly.

      Click here

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (MCO-) - 1 (SNS2) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 6 Click here

    OK

  5. CHECK MAP LIGHT ASSEMBLY


    1. Turn the engine switch on (ACC).

    2. Connect an oscilloscope to terminals T7-3 (MCO+) and T7-2 (MCO-) of the map light assembly connector.

    3. B005BCHC02
      *a

      Component with harness connected

      (Map Light Assembly)

      Check the waveform of the telephone microphone assembly using the oscilloscope.

    4. Proceed to the next step based on the inspection result.

      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

    A

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    B

  6. CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly.

      Click here

    2. Check if the same DTC is output again.


      Body Electrical > Navigation System > Trouble Codes
      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here

  7. 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
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. 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
      I38-27 (MIN+) - Body ground Always 10 kΩ or higher
      I38-48 (MIN-) - Body ground Always 10 kΩ or higher
      I38-28 (SGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. 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
      I40-33 (MCVD) - Body ground Always 10 kΩ or higher
      I40-34 (MCI+) - Body ground Always 10 kΩ or higher
      I40-35 (MCI-) - Body ground Always 10 kΩ or higher
      I40-32 (SGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK RADIO RECEIVER ASSEMBLY


    1. B005ACWC74
      *a

      Component with harness connected

      (Radio Receiver Assembly)

      Disconnect the I40 DCM (telematics transceiver) connector.

    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

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

  11. CHECK DCM (TELEMATICS TRANSCEIVER)


    1. B0057H2C09
      *a

      Component with harness connected

      (DCM [Telematics Transceiver])

      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 Engine switch on (ACC) 4 to 6 V

    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
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DCM (TELEMATICS TRANSCEIVER) Click here

    OK

  12. INSPECT MAP LIGHT ASSEMBLY


    1. B00586FN12

      Remove the map light assembly.

      Click here

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (MCO-) - 1 (SNS2) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 14 Click here

    OK

  13. CHECK MAP LIGHT ASSEMBLY


    1. B005BCHC02
      *a

      Component with harness connected

      (Map Light Assembly)

      Turn the engine switch on (ACC).

    2. Connect an oscilloscope to terminals T7-3 (MCO+) and T7-2 (MCO-) of the map light assembly connector.

    3. 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

    A

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    B

  14. CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly.

      Click here

    2. Check if the same DTC is output again.


      Body Electrical > Navigation System > Trouble Codes
      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here