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 roof console box 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.

  • Roof console box assembly (telephone microphone assembly)

  • DCM (telematics transceiver)*1

  • Radio and display receiver assembly

  • Harness or connector

WIRING DIAGRAM

A011V35E08

INSPECTION PROCEDURE

Note

After replacing the radio and display receiver assembly of vehicles subscribed to pay-type satellite radio broadcasts, XM radio ID registration is necessary (w/ SDARS System).

PROCEDURE

  1. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

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

      A011TUVE95
      Standard Resistance
      Tester Connection Condition Specified Condition
      I155-19 (MIN-) - Body ground Always Below 1 Ω
      Text in Illustration
      *a

      Component with harness connected

      (Radio and Display Receiver Assembly)
    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    OK

  2. CONFIRM MODEL

    1. Choose the model to be inspected.

      Result
      Model Proceed to
      w/ Manual (SOS) Switch A
      w/o Manual (SOS) Switch B
    B

    CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)) Click here

    A

  3. CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))

    1. Disconnect the DCM (telematics transceiver) connector.

    2. Disconnect the roof console box assembly (telephone microphone assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I135-35 (MCI-) - S12-12 (MCO-) Always Below 1 Ω
      I135-35 (MCI-) - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    1. Disconnect the radio and display receiver assembly connector.

    2. Disconnect the DCM (telematics transceiver) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I155-19 (MIN-) - I135-19 (MCO-) Always Below 1 Ω
      I155-19 (MIN-) - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))

    1. Disconnect the radio and display receiver assembly connector.

    2. Disconnect the roof console box assembly (telephone microphone assembly) connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      I155-6 (SNS2) - S12-15 (SNS2) Always Below 1 Ω
      I155-6 (SNS2) - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT DCM (TELEMATICS TRANSCEIVER)

    1. Reconnect the DCM (telematics transceiver) connector.

    2. Reconnect the radio and display receiver assembly connector.

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

      A011RTZE62
      Standard Resistance
      Tester Connection Condition Specified Condition
      I135-35 (MCI-) - Body ground Always Below 1 Ω

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

      Result
      Result Proceed to
      NG A
      OK B
      Text in Illustration
      *a

      Component with harness connected

      (DCM (Telematics Transceiver))
    B

    INSPECT ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) Click here

    A

    REPLACE DCM (TELEMATICS TRANSCEIVER) Click here

  7. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))

    1. Disconnect the radio and display receiver assembly connector.

    2. Disconnect the roof console box assembly (telephone microphone assembly) connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      I155-6 (SNS2) - S12-15 (SNS2) Always Below 1 Ω
      I155-19 (MIN-) - S12-12 (MCO-) Always Below 1 Ω
      I155-6 (SNS2) - Body ground Always 10 kΩ or higher
      I155-19 (MIN-) - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

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

      A011SIUE23
      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      S12-15 (SNS2) - S12-12 (MCO-) Always Below 1 Ω
      Text in Illustration
      *a

      Component without harness connected

      (Roof Console Box Assembly (Telephone Microphone Assembly))
    NG

    REPLACE ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) Click here

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here