NAVIGATION 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 (w/o Telematics Transceiver).

• 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 radio receiver assembly via the DCM (telematics transceiver) (w/ Telematics Transceiver).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CONFIRM MODEL

   
   

   1. Choose the model to be inspected.

      Model
      Model Proceed to w/o Telematics Transceiver A w/ Telematics Transceiver B

   
   

   B

   CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY) Click here

   A

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

   
   

   1. Disconnect the I38 radio receiver assembly connector.

   2. Disconnect the T7 map light assembly connector.

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

      Standard Resistance

      Tester Connection Condition Specified Condition I38-27 (MIN+) - T7-3 (MCO+) Always Below 1 Ω I38-29 (MACC) - T7-4 (MACC) Always Below 1 Ω I38-48 (MIN-) - T7-2 (MCO-) Always Below 1 Ω I38-49 (SNS2) - T7-1 (SNS2) Always Below 1 Ω I38-27 (MIN+) - Body ground Always 10 kΩ or higher I38-28 (SGND) - Body ground Always 10 kΩ or higher I38-29 (MACC) - Body ground Always 10 kΩ or higher I38-48 (MIN-) - Body ground Always 10 kΩ or higher I38-49 (SNS2) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. CHECK RADIO RECEIVER ASSEMBLY

   
   
   1. 

      *a	Component with harness connected (Radio Receiver Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition I38-29 (MACC) - Body ground Engine 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 I38-28 (SGND) - Body ground Always Below 1 Ω I38-48 (MIN-) - Body ground Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE RADIO 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 2 (MCO-) - 1 (SNS2) Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   GO TO STEP 6 Click here

   OK

5. CHECK MAP LIGHT ASSEMBLY

   
   

   1. Turn the engine switch on (ACC).

   2. Connect an oscilloscope to terminals T7-3 (MCO+) and T7-2 (MCO-) of the map light assembly connector.

   3. 

      *a	Component with harness connected (Map Light Assembly)

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

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

      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

   
   

   A

   REPLACE RADIO RECEIVER ASSEMBLY Click here

   B

6. CHECK TELEPHONE MICROPHONE ASSEMBLY

   
   

   1. Replace the telephone microphone assembly.

      Click here

   2. Check if the same problem occurs again.

      OK
      Malfunction does not disappears.

      Result
      Proceed to OK NG

   
   

   OK

   END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

   NG

   REPLACE MAP LIGHT ASSEMBLY Click here

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

   
   

   1. Disconnect the I38 radio receiver assembly connector.

   2. Disconnect the T7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition I38-49 (SNS2) - T7-1 (SNS2) Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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

   
   

   1. Disconnect the I38 radio receiver assembly connector.

   2. Disconnect the I40 DCM (telematics transceiver) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition I38-27 (MIN+) - I40-18 (MCO+) Always Below 1 Ω I38-48 (MIN-) - I40-19 (MCO-) Always Below 1 Ω I38-27 (MIN+) - Body ground Always 10 kΩ or higher I38-48 (MIN-) - Body ground Always 10 kΩ or higher I38-28 (SGND) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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

   
   

   1. Disconnect the I40 DCM (telematics transceiver) connector.

   2. Disconnect the T7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition I40-33 (MCVD) - T7-4 (MACC) Always Below 1 Ω I40-34 (MCI+) - T7-3 (MCO+) Always Below 1 Ω I40-35 (MCI-) - T7-2 (MCO-) Always Below 1 Ω I40-33 (MCVD) - Body ground Always 10 kΩ or higher I40-34 (MCI+) - Body ground Always 10 kΩ or higher I40-35 (MCI-) - Body ground Always 10 kΩ or higher I40-32 (SGND) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

10. CHECK RADIO RECEIVER ASSEMBLY

    
    
    1. 

       *a	Component with harness connected (Radio Receiver Assembly)

       Disconnect the I40 DCM (telematics transceiver) connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition I38-28 (SGND) - Body ground Always Below 1 Ω I38-48 (MIN-) - Body ground Always Below 1 Ω

       Result
       Proceed to OK NG

    
    

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    OK

11. CHECK DCM (TELEMATICS TRANSCEIVER)

    
    
    1. 

       *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 I40-33 (MCVD) - Body ground Engine 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 I40-32 (SGND) - Body ground Always Below 1 Ω I40-35 (MCI-) - Body ground Always Below 1 Ω

       Result
       Proceed to OK NG

    
    

    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 2 (MCO-) - 1 (SNS2) Always Below 1 Ω

       Result
       Proceed to OK NG

    
    

    NG

    GO TO STEP 14 Click here

    OK

13. CHECK MAP LIGHT ASSEMBLY

    
    
    1. 

       *a	Component with harness connected (Map Light Assembly)

       Turn the engine switch on (ACC).

    2. Connect an oscilloscope to terminals T7-3 (MCO+) and T7-2 (MCO-) 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

    
    

    A

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    B

14. CHECK TELEPHONE MICROPHONE ASSEMBLY

    
    

    1. Replace the telephone microphone assembly.

       Click here

    2. Check if the same problem occurs again.

       OK
       Malfunction does not disappears.

       Result
       Proceed to OK NG

    
    

    OK

    END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here