NAVIGATION SYSTEM, Diagnostic DTC:B1579

DTC Code DTC Name
B1579 Voice Recognition Microphone Disconnected

DESCRIPTION

The multi-media module 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 Code DTC Detection Condition Trouble Area
B1579 Telephone microphone signal is lost.

  • Multi-media module receiver assembly

  • Map light assembly

  • Telephone microphone assembly

  • DCM (Telematics transceiver) (w/ Emergency Call Switch)

  • Harness or connector

WIRING DIAGRAM

A01GJFYE11

INSPECTION PROCEDURE

Tech Tips

When replacing the multi-media module receiver assembly or the telematics transceiver, perform the vehicle contract setting Click here.

PROCEDURE


  1. CONFIRM MODEL


    1. Choose the model to be inspected.

      Model
      Model Proceed to
      w/o Emergency Call Switch A
      w/ Emergency Call Switch B

    B

    CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)


    1. Disconnect the L146 multi-media module receiver assembly connector.

    2. Disconnect the X4 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L146-27 (MIN+) - X4-21 (MI1+) Always Below 1 Ω
      L146-29 (MACC) - X4-22 (ACC) Always Below 1 Ω
      L146-48 (MIN-) - X4-20 (MIC-) Always Below 1 Ω
      L146-49 (SNS2) - X4-31 (SNS2) Always Below 1 Ω
      L146-27 (MIN+) - Body ground Always 10 kΩ or higher
      L146-28 (SGND) - Body ground Always 10 kΩ or higher
      L146-29 (MACC) - Body ground Always 10 kΩ or higher
      L146-48 (MIN-) - Body ground Always 10 kΩ or higher
      L146-49 (SNS2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY


    1. A01GK5ZE30
      Text in Illustration
      *a

      Component with harness connected

      (Multi-media Module Receiver Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      L146-29 (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
      L146-28 (SGND) - Body ground Always Below 1 Ω
      L146-48 (MIN-) - Body ground Always Below 1 Ω

    NG

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    OK

  4. INSPECT MAP LIGHT ASSEMBLY


    1. A01GKPPE06

      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
      20 (MIC-) - 31 (SNS2) Always Below 1 Ω

    NG

    CHECK TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  5. CHECK MAP LIGHT ASSEMBLY


    1. A01GL2WE04
      Text in Illustration
      *a

      Component with harness connected

      (Map Light Assembly)

      Turn the engine switch on (ACC).

    2. Connect an oscilloscope to terminals X4-20 (MIC-) and X4-21 (MI1+) 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

    B

    CHECK TELEPHONE MICROPHONE ASSEMBLY Click here

    A

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

  6. CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a new or normally functioning one Click here.

    2. Check if the same DTC is output again.

      Result
      Result Proceed to
      No DTCs are output. A
      DTCs are output. B

    B

    REPLACE MAP LIGHT ASSEMBLY Click here

    A

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

  7. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)


    1. Disconnect the L146 multi-media module receiver assembly connector.

    2. Disconnect the X4 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L146-49 (SNS2) - X4-31 (SNS2) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - DCM [TELEMATICS TRANSCEIVER])


    1. Disconnect the L146 multi-media module receiver assembly connector.

    2. Disconnect the L142 DCM (telematics transceiver) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L146-27 (MIN+) - L142-7 (MCO+) Always Below 1 Ω
      L146-48 (MIN-) - L142-8 (MCO-) Always Below 1 Ω
      L146-27 (MIN+) - Body ground Always 10 kΩ or higher
      L146-48 (MIN-) - Body ground Always 10 kΩ or higher
      L146-28 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - MAP LIGHT ASSEMBLY)


    1. Disconnect the L142 DCM (telematics transceiver) connector.

    2. Disconnect the X4 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L142-20 (MCVD) - X4-22 (ACC) Always Below 1 Ω
      L142-6 (MCI+) - X4-21 (MI1+) Always Below 1 Ω
      L142-5 (MCI-) - X4-20 (MIC-) Always Below 1 Ω
      L142-20 (MCVD) - Body ground Always 10 kΩ or higher
      L142-6 (MCI+) - Body ground Always 10 kΩ or higher
      L142-5 (MCI-) - Body ground Always 10 kΩ or higher
      L142-21 (SGND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY


    1. A01GK5ZE31
      Text in Illustration
      *a

      Component with harness connected

      (Multi-media Module Receiver Assembly)

      Disconnect the L142 DCM (telematics transceiver) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L146-28 (SGND) - Body ground Always Below 1 Ω
      L146-48 (MIN-) - Body ground Always Below 1 Ω

    NG

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    OK

  11. CHECK DCM (TELEMATICS TRANSCEIVER)


    1. A01GKA9E06
      Text in Illustration
      *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
      L142-20 (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
      L142-21 (SGND) - Body ground Always Below 1 Ω
      L142-5 (MCI-) - Body ground Always Below 1 Ω

    NG

    REPLACE DCM (TELEMATICS TRANSCEIVER) Click here

    OK

  12. INSPECT MAP LIGHT ASSEMBLY


    1. A01GKPPE06

      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
      20 (MIC-) - 31 (SNS2) Always Below 1 Ω

    NG

    CHECK TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

  13. CHECK MAP LIGHT ASSEMBLY


    1. A01GL2WE04
      Text in Illustration
      *a

      Component with harness connected

      (Map Light Assembly)

      Turn the engine switch on (ACC).

    2. Connect an oscilloscope to terminals X4-21 (MI1+) and X4-20 (MIC-) 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

    B

    CHECK TELEPHONE MICROPHONE ASSEMBLY Click here

    A

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

  14. CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a new or normally functioning one Click here.

    2. Check if the same DTC is output again.

      Result
      Result Proceed to
      No DTCs are output. A
      DTCs are output. B

    B

    REPLACE MAP LIGHT ASSEMBLY Click here

    A

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)