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

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.

  Using this circuit, the radio and display 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 and display receiver assembly.

WIRING DIAGRAM

*a	(Shielded)
*b	Map Light Assembly (Telephone Microphone Assembly)
*c	Radio and Display Receiver Assembly

PROCEDURE

1. CHECK MICROPHONE (OPERATION CHECK)

   
   

   1. 

      Enter the "Microphone Check" screen. Refer to Check Microphone in Operation Check.

      Click here

   2. When a voice is input into the microphone, check that the microphone input level meter changes according to the input voice.

      OK
      Check result is normal.

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

   NG

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

   
   

   1. Disconnect the F125 radio and display receiver assembly connector.

   2. Disconnect the R2 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 F125-6 (SNS2) - R2-1 (SNS2) Always Below 1 Ω F125-4 (MACC) - R2-9 (MACC) Always Below 1 Ω F125-5 (MIN+) - R2-8 (MCO+) Always Below 1 Ω F125-19 (MIN-) - R2-7 (MCO-) Always Below 1 Ω F125-6 (SNS2) or R2-1 (SNS2) - Body ground Always 10 kΩ or higher F125-4 (MACC) or R2-9 (MACC) - Body ground Always 10 kΩ or higher F125-5 (MIN+) or R2-8 (MOC+) - Body ground Always 10 kΩ or higher F125-19 (MIN-) or R2-7 (MCO-) - Body ground Always 10 kΩ or higher F125-18 (SGND) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

   
   

   1. Reconnect the F125 radio and display receiver assembly connector.

   2. Reconnect the R2 map light assembly (telephone microphone assembly) connector.

   3. 

      *a	Component with harness connected (Radio and Display Receiver Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition F125-4 (MACC) - Body ground Power switch on (ACC) 4 to 6 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition F125-18 (SGND) - Body ground Always Below 1 Ω F125-19 (MIN-) - Body ground Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

   OK

4. INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

   
   

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

      Click here

   2. 

      *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 1 (SNS2) - 7 (MCO-) Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) Click here

   OK

5. INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

   
   

   1. Reconnect the F125 radio and display receiver assembly connector.

   2. Reconnect the R2 map light assembly (telephone microphone assembly) connector.

   3. Turn the power switch to ACC.

   4. 

      *a	Component with harness connected (Map Light Assembly (Telephone Microphone Assembly))

      Connect an oscilloscope to terminals 8 (MCO+) and 7 (MCO-) of the R2 map light assembly (telephone microphone assembly) connector.

   5. Check the waveform of the map light assembly (telephone microphone assembly) using the oscilloscope.

      Result
      Result Proceed to A waveform synchronized with the voice input to the map light assembly (telephone microphone assembly) is output. A A waveform synchronized with the voice input to the map light assembly (telephone microphone assembly) is not output. B

   
   

   A

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   B

   REPLACE MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) Click here