NAVIGATION SYSTEM Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

• The multi-media module 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 multi-media module 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 multi-media module receiver assembly (w/o Emergency Call Switch).

• Using this circuit, the DCM (telematics transceiver) sends power to the map light assembly (telephone microphone assembly), and the map light assembly (telephone microphone assembly) sends microphone signals to the multi-media module receiver assembly via the DCM (telematics transceiver) (w/ Emergency Call Switch).

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CONFIRM MODEL

   
   

   1. Choose the model to be inspected.

      Model

      Model	Proceed to
      w/o Emergency Call Switch	A
      w/ Emergency Call Switch	B

   
   

   B

   Click here

   A

2. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)

   
   

   1. Disconnect the L164 multi-media module receiver assembly connector.

   2. Disconnect the X4 map light assembly connector.

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

      Standard Resistance

      Tester Connection Condition Specified Condition L164-27 (MIN+) - X4-21 (MI1+) Always Below 1 Ω L164-29 (MACC) - X4-22 (ACC) Always Below 1 Ω L164-48 (MIN-) - X4-20 (MIC-) Always Below 1 Ω L164-49 (SNS2) - X4-31 (SNS2) Always Below 1 Ω L164-27 (MIN+) - Body ground Always 10 kΩ or higher L164-28 (SGND) - Body ground Always 10 kΩ or higher L164-29 (MACC) - Body ground Always 10 kΩ or higher L164-48 (MIN-) - Body ground Always 10 kΩ or higher L164-49 (SNS2) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY

   
   
   1. 

      Text in Illustration

      *a	Component with harness connected (Multi-media Module Receiver Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition L164-29 (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 L164-28 (SGND) - Body ground Always Below 1 Ω L164-48 (MIN-) - Body ground Always Below 1 Ω

   
   

   NG

   REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

   OK

4. INSPECT MAP LIGHT ASSEMBLY

   
   

   1. 

      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 20 (MIC-) - 31 (SNS2) Always Below 1 Ω

   
   

   NG

   CHECK TELEPHONE MICROPHONE ASSEMBLY Click here

   OK

5. CHECK MAP LIGHT ASSEMBLY

   
   
   1. 

      Text in Illustration

      *a	Component with harness connected (Map Light Assembly)

      Turn the power switch on (ACC).

   2. Connect an oscilloscope to terminals X4-20 (MIC-) and X4-21 (MI1+) of the map light assembly connector.

   3. 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

   
   

   B

   CHECK TELEPHONE MICROPHONE ASSEMBLY Click here

   A

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

6. CHECK TELEPHONE MICROPHONE ASSEMBLY

   
   

   1. Replace the telephone microphone assembly with a new or normally functioning 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

   
   

   B

   REPLACE MAP LIGHT ASSEMBLY Click here

   A

   END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

7. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)

   
   

   1. Disconnect the L164 multi-media module receiver assembly connector.

   2. Disconnect the X4 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition L164-49 (SNS2) - X4-31 (SNS2) Always Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

8. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - DCM [TELEMATICS TRANSCEIVER])

   
   

   1. Disconnect the L164 multi-media module receiver assembly connector.

   2. Disconnect the L127 DCM (telematics transceiver) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition L164-27 (MIN+) - L127-7 (MCO+) Always Below 1 Ω L164-48 (MIN-) - L127-8 (MCO-) Always Below 1 Ω L164-27 (MIN+) - Body ground Always 10 kΩ or higher L164-48 (MIN-) - Body ground Always 10 kΩ or higher L164-28 (SGND) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

9. CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - MAP LIGHT ASSEMBLY)

   
   

   1. Disconnect the L127 DCM (telematics transceiver) connector.

   2. Disconnect the X4 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition L127-20 (MCVD) - X4-22 (ACC) Always Below 1 Ω L127-6 (MCI+) - X4-21 (MI1+) Always Below 1 Ω L127-5 (MCI-) - X4-20 (MIC-) Always Below 1 Ω L127-20 (MCVD) - Body ground Always 10 kΩ or higher L127-6 (MCI+) - Body ground Always 10 kΩ or higher L127-5 (MCI-) - Body ground Always 10 kΩ or higher L127-21 (SGND) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

10. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY

    
    
    1. 

       Text in Illustration

       *a	Component with harness connected (Multi-media Module Receiver Assembly)

       Disconnect the L127 DCM (telematics transceiver) connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition L164-28 (SGND) - Body ground Always Below 1 Ω L164-48 (MIN-) - Body ground Always Below 1 Ω

    
    

    NG

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    OK

11. CHECK DCM (TELEMATICS TRANSCEIVER)

    
    
    1. 

       Text in Illustration

       *a	Component with harness connected (DCM [Telematics Transceiver])

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

       Standard Voltage
       Tester Connection Switch Condition Specified Condition L127-20 (MCVD) - 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 L127-21 (SGND) - Body ground Always Below 1 Ω L127-5 (MCI-) - Body ground Always Below 1 Ω

    
    

    NG

    REPLACE DCM (TELEMATICS TRANSCEIVER) Click here

    OK

12. INSPECT MAP LIGHT ASSEMBLY

    
    

    1. 

       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 20 (MIC-) - 31 (SNS2) Always Below 1 Ω

    
    

    NG

    CHECK TELEPHONE MICROPHONE ASSEMBLY Click here

    OK

13. CHECK MAP LIGHT ASSEMBLY

    
    
    1. 

       Text in Illustration

       *a	Component with harness connected (Map Light Assembly)

       Turn the power switch on (ACC).

    2. Connect an oscilloscope to terminals X4-21 (MI1+) and X4-20 (MIC-) of the map light assembly connector.

    3. 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

    
    

    B

    CHECK TELEPHONE MICROPHONE ASSEMBLY Click here

    A

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

14. CHECK TELEPHONE MICROPHONE ASSEMBLY

    
    

    1. Replace the telephone microphone assembly with a new or normally functioning 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

    
    

    B

    REPLACE MAP LIGHT ASSEMBLY Click here

    A

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)