NAVIGATION SYSTEM (for Navigation Receiver Type), Diagnostic DTC:B1579

DTC Code DTC Name
B1579 Voice Recognition Microphone Disconnected

DESCRIPTION

The navigation ECU sub-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

  • Navigation ECU sub-assembly

  • Harness or connector

WIRING DIAGRAM

A011WNCE06

INSPECTION PROCEDURE

Note

After replacing the navigation ECU sub-assembly of vehicles subscribed to pay-type satellite radio broadcasts, registration of the XM radio ID is necessary.

PROCEDURE

  1. INSPECT NAVIGATION ECU SUB-ASSEMBLY

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

      A011XS0E88
      Standard Resistance
      Tester Connection Condition Specified Condition
      I67-19 (MIN-) - Body ground Always Below 1 Ω
      Text in Illustration
      *a

      Component with harness connected

      (Navigation ECU Sub-assembly)
    NG

    REPLACE NAVIGATION ECU SUB-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 (NAVIGATION ECU SUB-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 (NAVIGATION ECU SUB-ASSEMBLY - DCM (TELEMATICS TRANSCEIVER))

    1. Disconnect the navigation ECU sub-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
      I67-19 (MIN-) - I135-19 (MCO-) Always Below 1 Ω
      I67-19 (MIN-) - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (NAVIGATION ECU SUB-ASSEMBLY - ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))

    1. Disconnect the navigation ECU sub-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 Condition Specified Condition
      I67-6 (SNS2) - S12-15 (SNS2) Always Below 1 Ω
      I67-6 (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 navigation ECU sub-assembly connector.

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

      A011YI9E58
      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 (NAVIGATION ECU SUB-ASSEMBLY - ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))

    1. Disconnect the navigation ECU sub-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 Condition Specified Condition
      I67-6 (SNS2) - S12-15 (SNS2) Always Below 1 Ω
      I67-19 (MIN-) - S12-12 (MCO-) Always Below 1 Ω
      I67-6 (SNS2) - Body ground Always 10 kΩ or higher
      I67-19 (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.

      A011YTKE21
      Standard Resistance
      Tester Connection 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 NAVIGATION ECU SUB-ASSEMBLY Click here