AUDIO AND VISUAL SYSTEM(w/ Parking Assist Monitor System) Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

• The radio 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 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.

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   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.

   3. Push the recording switch and perform voice recording.

      Tip:
      

      • Select the recording switch with the blower motor of the air conditioning system stopped. If an outlet of the air conditioning system is facing the microphone, noise may be recorded.

      • Voice can be recorded for up to 5 seconds.

   4. Check that the recording indicator remains on while recording and that the recorded voice is played normally without noise or distortion.

      OK
      All check results are normal.

      Result
      Proceed to OK NG

   
   
   • OK

     REPLACE RADIO RECEIVER ASSEMBLYClick here

   • NGClick here
2. Click here

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

   
   

   1. Disconnect the O57 radio receiver assembly connector.

   2. Disconnect the W4 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 O57-49 (SNS2) - W4-1 (SNS2) Always Below 1 Ω O57-29 (MACC) - W4-4 (MACC) Always Below 1 Ω O57-27 (MIN+) - W4-3 (MCO+) Always Below 1 Ω O57-48 (MIN-) - W4-2 (MCO-) Always Below 1 Ω O57-49 (SNS2) - Body ground Always 10 kΩ or higher O57-29 (MACC) - Body ground Always 10 kΩ or higher O57-27 (MIN+) - Body ground Always 10 kΩ or higher O57-48 (MIN-) - Body ground Always 10 kΩ or higher O57-28 (SGND) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

3. Click here

   INSPECT RADIO RECEIVER ASSEMBLY

   
   

   1. Reconnect the O57 radio receiver assembly connector.

   2. Reconnect the W4 map light assembly (telephone microphone assembly) connector.

   3. 

      *a	Component with harness connected (Radio Receiver Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition O57-29 (MACC) - Body ground Engine 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 O57-28 (SGND) - Body ground Always Below 1 Ω O57-48 (MIN-) - Body ground Always Below 1 Ω

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     REPLACE RADIO RECEIVER ASSEMBLYClick here

4. Click here

   INSPECT MAP LIGHT 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) - 2 (MCO-) Always Below 1 Ω

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NGClick here

     GO TO STEP 6

5. Click here

   INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

   
   

   1. Reconnect the O57 radio receiver assembly connector.

   2. Reconnect the W4 map light assembly (telephone microphone assembly) connector.

   3. Turn the engine switch on (ACC).

   4. 

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

      Connect an oscilloscope to terminals 3 (MCO+) and 2 (MCO-) of the W4 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 TABLEClick here

   • BClick here
6. Click here

   REPLACE TELEPHONE MICROPHONE ASSEMBLY

   
   

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

      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

   • B

     REPLACE MAP LIGHT ASSEMBLYClick here