NAVIGATION SYSTEM Microphone Circuit between Microphone and Radio Receiver

DTC Code DTC Name
Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

This circuit sends a microphone signal from the telephone microphone assembly to the radio and display receiver assembly.

It also supplies power from the radio and display receiver assembly to the telephone microphone assembly.

WIRING DIAGRAM

E393511E02

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. 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

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

      Always

      Below 1 Ω

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

      Always

      Below 1 Ω

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

      Always

      Below 1 Ω

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

      Always

      Below 1 Ω

      G143-5 (MIN+) - Body ground

      Always

      10 kΩ or higher

      G143-18 (SGND) - Body ground

      Always

      10 kΩ or higher

      G143-4 (MACC) - Body ground

      Always

      10 kΩ or higher

      G143-19 (MIN-) - 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

  2. 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

  3. REPLACE TELEPHONE MICROPHONE ASSEMBLY

    1. Replace the telephone microphone assembly with a known good one.

      Click here

    2. Check if the same problem occurs again.

      OK

      Malfunction disappears.

    Result

    Proceed to

    OK

    NG
    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    Click here