AUDIO AND VISUAL SYSTEM(w/o Multi-display) 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 (telephone microphone assembly), and the map light assembly (telephone microphone assembly) sends microphone signals to the radio receiver assembly. The radio receiver assembly and map light assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.

WIRING DIAGRAM

E252007E01

PROCEDURE

  1. INSPECT RADIO RECEIVER ASSEMBLY

    1. E195982C02

      *a

      Component without harness connected

      (Radio Receiver Assembly)

      Disconnect the H31 radio receiver assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H31-6 (SGND) - Body ground

      Always

      Below 1 Ω

      H31-5 (MIN-) - Body ground

      Always

      Below 1 Ω

      Result

      Result

      OK

      NG
    NG

    REPLACE RADIO RECEIVER ASSEMBLY

    Click here

    OK

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

    1. Disconnect the H31 radio receiver assembly connector.

    2. Disconnect the W7 map light assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H31-2 (MIN+) - W7-12 (MCO+)

      Always

      Below 1 Ω

      H31-5 (MIN-) - W7-13 (MCO-)

      Always

      Below 1 Ω

      H31-3 (MACC) - W7-11 (MACC)

      Always

      Below 1 Ω

      H31-1 (SNS2) - W7-14 (SNS2)

      Always

      Below 1 Ω

      H31-2 (MIN+) - Body ground

      Always

      10 kΩ or higher

      H31-5 (MIN-) - Body ground

      Always

      10 kΩ or higher

      H31-6 (SGND) - Body ground

      Always

      10 kΩ or higher

      H31-3 (MACC) - Body ground

      Always

      10 kΩ or higher

      H31-1 (SNS2) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK RADIO RECEIVER ASSEMBLY

    1. E195982C03

      *a

      Component without harness connected

      (Display and Navigation module Display)

      Disconnect the H31 radio receiver assembly connector.

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      H31-3 (MACC) - Body ground

      Engine switch on (ACC)

      4.75 to 5.25 V

      Result

      Result

      OK

      NG
    NG

    REPLACE RADIO RECEIVER ASSEMBLY

    Click here

    OK

  4. INSPECT MAP LIGHT ASSEMBLY

    1. E199612N04

      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

      14 (SNS2) - 13 (MCO-)

      Always

      Below 1 Ω

      Result

      Result

      OK

      NG
    NG

    REPLACE TELEPHONE MICROPHONE ASSEMBLYClick here

    OK

  5. CHECK MAP LIGHT ASSEMBLY

    1. E199613C01

      *a

      Component with harness connected

      (Map Light Assembly)

      Connect an oscilloscope to terminals W7-12 (MCO+) and W7-13 (MCO-) of the map light assembly connector.

    2. Check the waveform of the telephone microphone assembly using an oscilloscope.

      Result

      Result

      Proceed to

      Waveform synchronized with the voice input to the telephone microphone assembly is output

      A

      Waveform synchronized with the voice input to the telephone microphone assembly is not output

      B
    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    B

  6. REPLACE TELEPHONE MICROPHONE ASSEMBLY

    1. Replace the map light assembly.

      Click here

    2. Check if the same malfunction recurs.

      Result

      Result

      Proceed to

      Malfunction does not recur (returns to normal)

      A

      Malfunction recurs

      B
    A

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    B

    REPLACE MAP LIGHT ASSEMBLY

    Click here