NAVIGATION SYSTEM, 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 No.

Detection Item

DTC Detection Condition

Trouble Area

B1579

Voice Recognition Microphone Disconnected

Telephone microphone signal is lost.

  • Radio and display receiver assembly

  • Map light assembly

  • Telephone microphone assembly

  • Telematics transceiver*

  • Harness or connector

  • *: w/ Telematics Transceiver

WIRING DIAGRAM

E350989E05

CAUTION / NOTICE / HINT

Note:

Check that the wire harness is properly installed and does not have any sharp bends, pinching or loose connections.

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 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 G143 radio and display receiver assembly connector.

    2. Disconnect the Q16 map light assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G143-4 (MACC) - Q16-3 (MACC)

      Always

      Below 1 Ω

      G143-5 (MIN+) - Q16-4 (MCO+)

      Always

      Below 1 Ω

      G143-19 (MIN-) - Q16-6 (MCO-)

      Always

      Below 1 Ω

      G143-6 (SNS2) - Q16-5 (SNS2)

      Always

      Below 1 Ω

      G143-4 (MACC) - Body ground

      Always

      10 kΩ or higher

      G143-5 (MIN+) - Body ground

      Always

      10 kΩ or higher

      G143-19 (MIN-) - Body ground

      Always

      10 kΩ or higher

      G143-18 (SGND) - Body ground

      Always

      10 kΩ or higher

      G143-6 (SNS2) - 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. Remove the map light assembly.

      Click here

    2. Remove the telephone microphone assembly.

      Click here

    3. E355981C02

      *a

      Component without harness connected

      (Map Light Assembly)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A-3 (MACC) - B-5 (MACC)

      Always

      Below 1 Ω

      A-4 (MCO+) - B-3 (MIC+)

      Always

      Below 1 Ω

      A-5 (SNS2) - B-1 (SNS2)

      Always

      Below 1 Ω

      A-6 (MCO-) - B-2 (MIC-)

      Always

      Below 1 Ω

      A-3 (MACC) - A-4 (MCO+)

      Always

      10 kΩ or higher

      A-3 (MACC) - A-5 (SNS2)

      Always

      10 kΩ or higher

      A-3 (MACC) - A-6 (MCO-)

      Always

      10 kΩ or higher

      A-4 (MCO+) - A-5 (SNS2)

      Always

      10 kΩ or higher

      A-4 (MCO+) - A-6 (MCO-)

      Always

      10 kΩ or higher

      A-5 (SNS2) - A-6 (MCO-)

      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. Check for DTCs.

      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 AND DISPLAY RECEIVER ASSEMBLY

    Click here

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

    1. Disconnect the G143 radio and display receiver assembly connector.

    2. Disconnect the Q16 map light assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G143-6 (SNS2) - Q16-5 (SNS2)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    1. Disconnect the G143 radio and display receiver assembly connector.

    2. Disconnect the M38 telematics transceiver connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G143-5 (MIN+) - M38-18 (MCO+)

      Always

      Below 1 Ω

      G143-19 (MIN-) - M38-19 (MCO-)

      Always

      Below 1 Ω

      G143-5 (MIN+) - Body ground

      Always

      10 kΩ or higher

      G143-19 (MIN-) - Body ground

      Always

      10 kΩ or higher

      G143-18 (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 (TELEMATICS TRANSCEIVER - MAP LIGHT ASSEMBLY)

    1. Disconnect the M38 telematics transceiver connector.

    2. Disconnect the Q16 map light assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      M38-33 (MCVD) - Q16-3 (MACC)

      Always

      Below 1 Ω

      M38-34 (MCI+) - Q16-4 (MCO+)

      Always

      Below 1 Ω

      M38-35 (MCI-) - Q16-6 (MCO-)

      Always

      Below 1 Ω

      M38-33 (MCVD) - Body ground

      Always

      10 kΩ or higher

      M38-34 (MCI+) - Body ground

      Always

      10 kΩ or higher

      M38-35 (MCI-) - Body ground

      Always

      10 kΩ or higher

      M38-32 (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. Remove the map light assembly.

      Click here

    2. Remove the telephone microphone assembly.

      Click here

    3. E355981C02

      *a

      Component without harness connected

      (Map Light Assembly)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A-3 (MACC) - B-5 (MACC)

      Always

      Below 1 Ω

      A-4 (MCO+) - B-3 (MIC+)

      Always

      Below 1 Ω

      A-5 (SNS2) - B-1 (SNS2)

      Always

      Below 1 Ω

      A-6 (MCO-) - B-2 (MIC-)

      Always

      Below 1 Ω

      A-3 (MACC) - A-4 (MCO+)

      Always

      10 kΩ or higher

      A-3 (MACC) - A-5 (SNS2)

      Always

      10 kΩ or higher

      A-3 (MACC) - A-6 (MCO-)

      Always

      10 kΩ or higher

      A-4 (MCO+) - A-5 (SNS2)

      Always

      10 kΩ or higher

      A-4 (MCO+) - A-6 (MCO-)

      Always

      10 kΩ or higher

      A-5 (SNS2) - A-6 (MCO-)

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE MAP LIGHT ASSEMBLY

    Click here

    OK

  9. CHECK TELEMATICS TRANSCEIVER

    1. Disconnect the Q16 map light assembly connector.

    2. E283057C28

      *a

      Component with harness connected

      (Telematics Transceiver)

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      M38-33 (MCVD) - Body ground

      Engine switch on (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

      M38-32 (SGND) - Body ground

      Always

      Below 1 Ω

      M38-35 (MCI-) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE TELEMATICS TRANSCEIVER

    Click here

    OK

  10. REPLACE 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. Check for DTCs.

      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 AND DISPLAY RECEIVER ASSEMBLY

    Click here