AUDIO AND VISUAL SYSTEM, Diagnostic DTC:B1579

DTC Code DTC Name
B1579 Voice Recognition Microphone Disconnected

DESCRIPTION

The radio receiver assembly and 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

  • Telephone microphone assembly

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

  • Harness or connector

WIRING DIAGRAM

B004VG0E03
w/ Telematics Transceiver
*a Telephone Microphone Assembly
*b DCM (Telematics Transceiver)
*c Radio Receiver Assembly
B004W4UE08
w/o Telematics Transceiver
*a Telephone Microphone Assembly
*b Radio Receiver Assembly

CAUTION / NOTICE / HINT

Note


  • When replacing the radio receiver assembly, always replace it with a new one.

    If a radio receiver assembly which was installed to another vehicle is used, the following may occur:


    • A communication malfunction DTC may be stored.

    • The radio receiver assembly may not operate normally.

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 Audio and Visual System.

Click here

PROCEDURE


  1. CHECK VEHICLE TYPE


    1. Check the vehicle type.

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

    B

    CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY)


    1. Disconnect the G54 radio receiver assembly connector.

    2. Disconnect the N15 telephone microphone assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G54-25 (SNS2) - N15-3 (SNS2) Always Below 1 Ω
      G54-25 (SNS2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - TELEPHONE MICROPHONE ASSEMBLY)


    1. Disconnect the G56 DCM (telematics transceiver) connector.

    2. Disconnect the N15 telephone microphone assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G56-35 (MCI-) - N15-4 (MCO-) Always Below 1 Ω
      G56-35 (MCI-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK DCM (TELEMATICS TRANSCEIVER) (MCI-)


    1. B004UB3C12
      *a

      Component with harness connected

      (DCM [Telematics Transceiver])

      Remove the DCM (telematics transceiver) with the connector(s) still connected.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G56-35 (MCI-) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DCM (TELEMATICS TRANSCEIVER) Click here

    OK

  5. INSPECT TELEPHONE MICROPHONE ASSEMBLY (SNS2, MCO-)


    1. Remove the telephone microphone assembly.

      Click here

    2. B004YAIN01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (SNS2) - 4 (MCO-) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    NG

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here

  6. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY)


    1. Disconnect the G54 radio receiver assembly connector.

    2. Disconnect the N15 telephone microphone assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G54-25 (SNS2) - N15-3 (SNS2) Always Below 1 Ω
      G54-22 (MIN-) - N15-4 (MCO-) Always Below 1 Ω
      G54-25 (SNS2) - Body ground Always 10 kΩ or higher
      G54-22 (MIN-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT TELEPHONE MICROPHONE ASSEMBLY (SNS2, MCO-)


    1. Remove the telephone microphone assembly.

      Click here

    2. B004YAIN01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (SNS2) - 4 (MCO-) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    NG

    REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here