NAVIGATION SYSTEM(for Radio and Display Type), Diagnostic DTC:B1579

DTC Code DTC Name
B1579 Voice Recognition Microphone Disconnected

DESCRIPTION

The radio and display 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.

  • Radio and display receiver assembly

  • Map light assembly

  • Telephone microphone assembly

  • Telematics transceiver*

  • Harness or connector

WIRING DIAGRAM

B001EJYE01

CAUTION / NOTICE / HINT

Tech Tips

When replacing 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 Telematics Transceiver A
      w/ Telematics Transceiver B

    B

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

    A

  2. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)


    1. Disconnect the H51 radio and display receiver assembly connector.

    2. Disconnect the W7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H51-5 (MIN+) - W7-12 (MCO+) Always Below 1 Ω
      H51-4 (MACC) - W7-11 (MACC) Always Below 1 Ω
      H51-19 (MIN-) - W7-13 (MCO-) Always Below 1 Ω
      H51-6 (SNS2) - W7-14 (SNS2) Always Below 1 Ω
      H51-5 (MIN+) - Body ground Always 10 kΩ or higher
      H51-18 (SGND) - Body ground Always 10 kΩ or higher
      H51-4 (MACC) - Body ground Always 10 kΩ or higher
      H51-19 (MIN-) - Body ground Always 10 kΩ or higher
      H51-6 (SNS2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT MAP LIGHT ASSEMBLY


    1. Remove the map light assembly.

      Click here

    2. Remove the telephone microphone assembly.

      Click here

    3. B001GUVC01
      *a

      Component without harness connected

      (Map Light Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-11 (MACC) - B-5 (MACC) Always Below 1 Ω
      A-12 (MCO+) - B-3 (MIC+) Always Below 1 Ω
      A-13 (MCO-) - B-2 (MIC-) Always Below 1 Ω
      A-14 (SNS2) - B-1 (SNS2) Always Below 1 Ω
      A-11 (MACC) - A-12 (MCO+) Always 10 kΩ or higher
      A-11 (MACC) - A-13 (MCO-) Always 10 kΩ or higher
      A-11 (MACC) - A-14 (SNS2) Always 10 kΩ or higher
      A-12 (MCO+) - A-13 (MCO-) Always 10 kΩ or higher
      A-12 (MCO+) - A-14 (SNS2) Always 10 kΩ or higher
      A-13 (MCO-) - A-14 (SNS2) Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here

    OK

  4. CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a new known good one.

      Click here

    2. Check if the same DTC is output again.

      Click here

      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

  5. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)


    1. Disconnect the H51 radio and display receiver assembly connector.

    2. Disconnect the W7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H51-6 (SNS2) - W7-14 (SNS2) Always Below 1 Ω
      H51-6 (SNS2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - TELEMATICS TRANSCEIVER)


    1. Disconnect the H51 radio and display receiver assembly connector.

    2. Disconnect the G187 telematics transceiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H51-5 (MIN+) - G187-18 (MCO+) Always Below 1 Ω
      H51-19 (MIN-) - G187-19 (MCO-) Always Below 1 Ω
      H51-5 (MIN+) - Body ground Always 10 kΩ or higher
      H51-19 (MIN-) - Body ground Always 10 kΩ or higher
      H51-18 (SGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (TELEMATICS TRANSCEIVER - MAP LIGHT ASSEMBLY)


    1. Disconnect the G187 telematics transceiver connector.

      Click here

    2. Disconnect the W7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G187-33 (MCVD) - W7-11 (MACC) Always Below 1 Ω
      G187-34 (MCI+) - W7-12 (MCO+) Always Below 1 Ω
      G187-35 (MCI-) - W7-13 (MCO-) Always Below 1 Ω
      G187-33 (MCVD) - Body ground Always 10 kΩ or higher
      G187-34 (MCI+) - Body ground Always 10 kΩ or higher
      G187-35 (MCI-) - Body ground Always 10 kΩ or higher
      G187-32 (SGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT MAP LIGHT ASSEMBLY


    1. Remove the map light assembly.

      Click here

    2. Remove the telephone microphone assembly.

      Click here

    3. B001GUVC01
      *a

      Component without harness connected

      (Map Light Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-11 (MACC) - B-5 (MACC) Always Below 1 Ω
      A-12 (MCO+) - B-3 (MIC+) Always Below 1 Ω
      A-13 (MCO-) - B-2 (MIC-) Always Below 1 Ω
      A-14 (SNS2) - B-1 (SNS2) Always Below 1 Ω
      A-11 (MACC) - A-12 (MCO+) Always 10 kΩ or higher
      A-11 (MACC) - A-13 (MCO-) Always 10 kΩ or higher
      A-11 (MACC) - A-14 (SNS2) Always 10 kΩ or higher
      A-12 (MCO+) - A-13 (MCO-) Always 10 kΩ or higher
      A-12 (MCO+) - A-14 (SNS2) Always 10 kΩ or higher
      A-13 (MCO-) - A-14 (SNS2) Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here

    OK

  9. CHECK TELEMATICS TRANSCEIVER


    1. Disconnect the W7 map light assembly connector.

    2. B001IJVC21
      *a

      Component with harness connected

      (Telematics Transceiver)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G187-33 (MCVD) - 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
      G187-32 (SGND) - Body ground Always Below 1 Ω
      G187-35 (MCI-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TELEMATICS TRANSCEIVER Click here

    OK

  10. CHECK TELEPHONE MICROPHONE ASSEMBLY


    1. Replace the telephone microphone assembly with a new known good one.

      Click here

    2. Check if the same DTC is output again.

      Click here

      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here