AUDIO AND VISUAL SYSTEM(for Radio Receiver Type) Microphone Circuit between Microphone and Radio Receiver

DTC Code DTC Name
Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

Using this circuit, the radio receiver assembly sends power to the map light assembly, and the map light assembly sends microphone signals to the radio receiver assembly.

WIRING DIAGRAM

E273268E09

PROCEDURE

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

    1. Disconnect the G48 radio receiver assembly connector.

    2. Disconnect the Q16 map light assembly (telephone micro phone assembly) connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G48-6 (SNS2) - Q16-5 (SNS2)

      Always

      Below 1 Ω

      G48-4 (MACC) - Q16-3 (MACC)

      Always

      Below 1 Ω

      G48-5 (MIN+) - Q16-4 (MCO+)

      Always

      Below 1 Ω

      G48-19 (MIN-) - Q16-6 (MCO-)

      Always

      Below 1 Ω

      G48-6 (SNS2) - Body ground

      Always

      10 kΩ or higher

      G48-4 (MACC) - Body ground

      Always

      10 kΩ or higher

      G48-5 (MIN+) - Body ground

      Always

      10 kΩ or higher

      G48-19 (MIN-) - Body ground

      Always

      10 kΩ or higher

      G48-18 (SGND) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK RADIO RECEIVER ASSEMBLY

    1. E237416C01

      *a

      Component with harness connected

      (Radio Receiver Assembly)

      Remove the radio receiver assembly with its connector still connected.

      Click here

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      G48-4 (MACC) - Body ground

      Ignition switch 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

      G48-18 (SGND) - Body ground

      Always

      Below 1 Ω

      G48-19 (MIN-) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE RADIO RECEIVER ASSEMBLY

    Click here

    OK

  3. INSPECT MAP LIGHT ASSEMBLY

    1. E333810E01

      Remove the map light assembly.

      Click here

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      5 (SNS2) - 6 (MCO-)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    CHECK TELEPHONE MICROPHONE ASSEMBLYClick here

    OK

  4. CHECK MAP LIGHT ASSEMBLY

    1. E333811C01

      *a

      Component with harness connected

      (Map Light Assembly)

      Remove the map light assembly with its connector still connected.

      Click here

    2. Turn the ignition switch to ACC.

    3. Connect an oscilloscope to terminals 4 (MCO+) and 6 (MCO-) of the map light assembly connector.

    4. Check the waveform of the telephone microphone assembly using the oscilloscope.

    Result

    Result

    Proceed to

    A waveform synchronized with the voice input to the map light assembly is output

    A

    A waveform synchronized with the voice input to the map light assembly is not output

    B
    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    B

  5. CHECK TELEPHONE MICROPHONE ASSEMBLY

    1. Replace the telephone microphone assembly with a new or known good one and check that the malfunction disappears.

      Click here

    Result

    Proceed to

    Malfunction disappears

    Malfunction appears
    Malfunction disappears

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    Malfunction appears

  6. CHECK MAP LIGHT ASSEMBLY

    1. Replace the map light assembly with a new or known good one and check that the malfunction disappears.

      Click here

    Result

    Proceed to

    Malfunction disappears

    Malfunction appears
    Malfunction disappears

    END (MAP LIGHT ASSEMBLY IS DEFECTIVE)

    Malfunction appears

    REPLACE RADIO RECEIVER ASSEMBLY

    Click here

  7. CHECK TELEPHONE MICROPHONE ASSEMBLY

    1. Replace the telephone microphone assembly with a new or known good one and check that the malfunction disappears.

      Click here

    Result

    Proceed to

    Malfunction disappears

    Malfunction appears
    Malfunction disappears

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    Malfunction appears

    REPLACE MAP LIGHT ASSEMBLY

    Click here