NAVIGATION SYSTEM(for Navigation Receiver Type) Microphone Circuit between Microphone and Navigation Receiver Assembly

DESCRIPTION

• The navigation 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 navigation 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 navigation receiver assembly.

WIRING DIAGRAM

*a	(Shielded)
*b	Map Light Assembly (Telephone Microphone Assembly)
*c	Navigation 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.

   
   

   OK

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

   NG

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

   
   

   1. Disconnect the L38 navigation receiver assembly connector.

   2. Disconnect the U3 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 L38-4 (MACC) - U3-2 (MACC) Always Below 1 Ω L38-5 (MIN+) - U3-3 (MCO+) Always Below 1 Ω L38-19 (MIN-) - U3-4 (MCO-) Always Below 1 Ω L38-6 (SNS2) - U3-5 (SNS2) Always Below 1 Ω L38-4 (MACC) - Body ground Always 10 kΩ or higher L38-5 (MIN+) - Body ground Always 10 kΩ or higher L38-19 (MIN-) - Body ground Always 10 kΩ or higher L38-18 (SGND) - Body ground Always 10 kΩ or higher L38-6 (SNS2) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. INSPECT NAVIGATION RECEIVER ASSEMBLY

   
   
   1. 

      Text in Illustration

      *a	Component with harness connected (Navigation Receiver Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition L38-4 (MACC) - Body ground Power switch on (ACC) 4 to 6 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition L38-18 (SGND) - Body ground Always Below 1 Ω L38-19 (MIN-) - Body ground Always Below 1 Ω

   3. Proceed to the next step based on the inspection result.

      Result
      Result Proceed to NG A OK B

   
   

   A

   REPLACE NAVIGATION RECEIVER ASSEMBLY Click here

   B

4. INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

   
   

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

   2. 

      Text in Illustration

      *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 5 (SNS2) - 4 (MCO-) Always Below 1 Ω

   
   

   NG

   REPLACE TELEPHONE MICROPHONE ASSEMBLY Click here

   OK

5. INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

   
   

   1. Turn the power switch on (ACC).

   2. 

      Text in Illustration

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

      Connect an oscilloscope to terminals 3 (MCO+) and 4 (MCO-) of the U3 map light assembly (telephone microphone assembly) connector.

   3. 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

6. 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 ASSEMBLY Click here