AUDIO AND VISUAL SYSTEM(for 8 Speakers), Diagnostic DTC:B1579

DTC Code DTC Name
B1579 Voice Recognition Microphone Disconnected

DESCRIPTION

The radio 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 No. Detection Item DTC Detection Condition Trouble Area
B1579 Voice Recognition Microphone Disconnected Microphone signal is lost

  • Radio receiver assembly

  • Map light assembly

  • Telephone microphone assembly

  • Harness or connector

  • DCM (telematics transceiver)*

WIRING DIAGRAM

B002I56E02

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. 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 RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY) Click here

    A

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


    1. Disconnect the I121 radio receiver assembly connector.

    2. Disconnect the T7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I121-6 (SNS2) - T7-1 (SNS2) Always Below 1 Ω
      I121-4 (MACC) - T7-4 (MACC) Always Below 1 Ω
      I121-5 (MIN+) - T7-3 (MCO+) Always Below 1 Ω
      I121-19 (MIN-) - T7-2 (MCO-) Always Below 1 Ω
      I121-18 (SGND) - Body ground Always 10 kΩ or higher
      I121-6 (SNS2) or T7-1 (SNS2) - Body ground Always 10 kΩ or higher
      I121-4 (MACC) or T7-4 (MACC) - Body ground Always 10 kΩ or higher
      I121-5 (MIN+) or T7-3 (MCO+) - Body ground Always 10 kΩ or higher
      I121-19 (MIN-) or T7-2 (MCO-) - 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. B002IWVN01

      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-1 (SNS2) - B-3 (SNS2) Always Below 1 Ω
      A-4 (MACC) - B-6 (MACC) Always Below 1 Ω
      A-3 (MCO+) - B-5 (MIC+) Always Below 1 Ω
      A-2 (MCO-) - B-4 (MIC-) Always Below 1 Ω
      A-1 (SNS2) - A-2 (MCO-) Always 10 kΩ or higher
      A-1 (SNS2) - A-3 (MCO+) Always 10 kΩ or higher
      A-1 (SNS2) - A-4 (MACC) Always 10 kΩ or higher
      A-2 (MCO-) - A-3 (MCO+) Always 10 kΩ or higher
      A-2 (MCO-) - A-4 (MACC) Always 10 kΩ or higher
      A-3 (MCO+) - A-4 (MACC) 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 or known good one.

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Navigation System > Clear DTCs

    3. Recheck for DTCs and check that no DTCs are output.

      Click here


      Body Electrical > Navigation System > Trouble Codes
      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

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


    1. Disconnect the I121 radio receiver assembly connector.

    2. Disconnect the T7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I121-6 (SNS2) - T7-1 (SNS2) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - DCM [TELEMATICS TRANSCEIVER])


    1. Disconnect the I121 radio receiver assembly connector.

    2. Disconnect the I40 DCM (telematics transceiver) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I121-5 (MIN+) - I40-18 (MCO+) Always Below 1 Ω
      I121-19 (MIN-) - I40-19 (MCO-) Always Below 1 Ω
      I121-5 (MIN+) - Body ground Always 10 kΩ or higher
      I121-19 (MIN-) - Body ground Always 10 kΩ or higher
      I121-18 (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 (DCM [TELEMATICS TRANSCEIVER] - MAP LIGHT ASSEMBLY)


    1. Disconnect the I40 DCM (telematics transceiver) connector.

    2. Disconnect the T7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I40-33 (MCVD) - T7-4 (MACC) Always Below 1 Ω
      I40-34 (MCI+) - T7-3 (MCO+) Always Below 1 Ω
      I40-35 (MCI-) - T7-2 (MCO-) Always Below 1 Ω
      I40-33 (MCVD) - Body ground Always 10 kΩ or higher
      I40-34 (MCI+) - Body ground Always 10 kΩ or higher
      I40-35 (MCI-) - Body ground Always 10 kΩ or higher
      I40-32 (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. B002IWVN01

      Remove the map light assembly.

      Click here

    2. Remove the telephone microphone assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-1 (SNS2) - B-3 (SNS2) Always Below 1 Ω
      A-4 (MACC) - B-6 (MACC) Always Below 1 Ω
      A-3 (MCO+) - B-5 (MIC+) Always Below 1 Ω
      A-2 (MCO-) - B-4 (MIC-) Always Below 1 Ω
      A-1 (SNS2) - A-2 (MCO-) Always 10 kΩ or higher
      A-1 (SNS2) - A-3 (MCO+) Always 10 kΩ or higher
      A-1 (SNS2) - A-4 (MACC) Always 10 kΩ or higher
      A-2 (MCO-) - A-3 (MCO+) Always 10 kΩ or higher
      A-2 (MCO-) - A-4 (MACC) Always 10 kΩ or higher
      A-3 (MCO+) - A-4 (MACC) Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here

    OK

  9. CHECK DCM (TELEMATICS TRANSCEIVER)


    1. B002KUEC08
      *a

      Component with harness connected

      (DCM [Telematics Transceiver])

      Disconnect the T7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I40-32 (SGND) - Body ground Always Below 1 Ω
      I40-35 (MCI-) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I40-33 (MCVD) - Body ground Power switch on (ACC) 4 to 6 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DCM (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


      Body Electrical > Navigation System > Clear DTCs

    3. Recheck for DTCs and check that no DTCs are output.

      Click here


      Body Electrical > Navigation System > Trouble Codes
      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here