AUDIO AND VISUAL 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

B001I01E01

CAUTION / NOTICE / HINT

Note

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

Click here

PROCEDURE


  1. CHECK VEHICLE CONDITION


    1. Check the vehicle condition.

      Result
      Result 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
      H51-4 (MACC) - W7-11 (MACC) Always Below 1 Ω
      H51-5 (MIN+) - W7-12 (MCO+) Always Below 1 Ω
      H51-19 (MIN-) - W7-13 (MCO-) Always Below 1 Ω
      H51-6 (SNS2) - W7-14 (SNS2) Always Below 1 Ω
      H51-4 (MACC) - Body ground Always 10 kΩ or higher
      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
      H51-6 (SNS2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT MAP LIGHT ASSEMBLY


    1. B001GUVN01

      Remove the map light assembly.

      Click here

    2. Remove the telephone microphone assembly.

      Click here

    3. 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

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here

    OK

  4. CHECK TELEPHONE MICROPHONE ASSEMBLY


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

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      No DTCs are output.

    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

    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

    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.

    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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT MAP LIGHT ASSEMBLY


    1. B001GUVN01

      Remove the map light assembly.

      Click here

    2. Remove the telephone microphone assembly.

      Click here

    3. 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

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here

    OK

  9. CHECK TELEMATICS TRANSCEIVER


    1. B001IJVC19
      *a

      Component with harness connected

      (Telematics Transceiver)

      Disconnect the W7 map light assembly connector.

    2. 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 Ignition switch 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

    NG

    REPLACE TELEMATICS TRANSCEIVER Click here

    OK

  10. CHECK TELEPHONE MICROPHONE ASSEMBLY


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

      Click here

    2. Clear the DTCs.

      Click here

    3. Check for DTCs.

      Click here

      OK
      No DTCs are output.

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here