AUDIO AND VISUAL SYSTEM(for Sedan Radio and Display Type), 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

Microphone signal is lost

  • Map light assembly

  • Telephone microphone assembly

  • Telematics transceiver*

  • Radio and display receiver assembly

  • Harness or connector

  • *: w/ Manual (SOS) Switch

WIRING DIAGRAM

Figure 1. w/o Manual (SOS) Switch
E226160E63
Figure 2. w/ Manual (SOS) Switch
E334504E04

PROCEDURE

  1. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

    1. E176671C40

      *a

      Component with harness connected

      (Radio and Display Receiver Assembly)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E60-19 (MIN-) - Body ground

      Always

      Below 1 Ω

    Result

    Result

    Proceed to

    OK

    (w/o Manual (SOS) Switch)

    A

    OK

    (w/ Manual (SOS) Switch)

    B

    NG

    C
    B

    CHECK HARNESS AND CONNECTOR (TELEMATICS TRANSCEIVER - MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))Click here

    C

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    Click here

    A

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

    1. Disconnect the E60 radio and display receiver assembly connector.

    2. Disconnect the O8 map light 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

      E60-6 (SNS2) - O8-5 (SNS2)

      Always

      Below 1 Ω

      E60-19 (MIN-) - O8-14 (MIC-)

      Always

      Below 1 Ω

      E60-6 (SNS2) or O8-5 (SNS2) - Body ground

      Always

      10 kΩ or higher

      E60-19 (MIN-) or O8-14 (MIC-) - 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 (telephone microphone assembly).

      Click here

    2. E265420C01

      *a

      Component without harness connected

      (Map Light Assembly (Telephone Microphone Assembly))

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      5 (SNS2) - 14 (MIC-)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    Click here

    NG

  4. REPLACE TELEPHONE MICROPHONE ASSEMBLY

    1. Replace the telephone microphone assembly.

      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.

      Body Electrical > Navigation System > Trouble Codes

      OK

      No DTCs are output.

    Result

    Proceed to

    OK

    NG
    OK

    END

    NG

    REPLACE MAP LIGHT ASSEMBLY

    Click here

  5. CHECK HARNESS AND CONNECTOR (TELEMATICS TRANSCEIVER - MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))

    1. Disconnect the E143 telematics transceiver connector.

    2. Disconnect the O8 map light 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

      E143-35 (MCI-) - O8-14 (MIC-)

      Always

      Below 1 Ω

      E143-35 (MCI-) or O8-14 (MIC-) - Body ground

      Always

      10 kΩ or higher

    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 E60 radio and display receiver assembly connector.

    2. Disconnect the E143 telematics transceiver connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E60-19 (MIN-) - E143-19 (MCO-)

      Always

      Below 1 Ω

      E60-19 (MIN-) or E143-19 (MCO-) - 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 (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))

    1. Disconnect the E60 radio and display receiver assembly connector.

    2. Disconnect the O8 map light 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

      E60-6 (SNS2) - O8-5 (SNS2)

      Always

      Below 1 Ω

      E60-6 (SNS2) or O8-5 (SNS2) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT TELEMATICS TRANSCEIVER

    1. E266270C17

      *a

      Component with harness connected

      (Telematics Transceiver)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E143-35 (MCI-) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE TELEMATICS TRANSCEIVER

    Click here

    OK

  9. INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

    1. Remove the map light assembly (telephone microphone assembly).

      Click here

    2. E265420C07

      *a

      Component without harness connected

      (Map Light Assembly (Telephone Microphone Assembly))

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      5 (SNS2) - 14 (MIC-)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    Click here

    NG

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

      Body Electrical > Navigation System > Trouble Codes

      OK

      No DTCs are output.

    Result

    Proceed to

    OK

    NG
    OK

    END

    NG

    REPLACE MAP LIGHT ASSEMBLY

    Click here