NAVIGATION SYSTEM Microphone Circuit between Microphone and Navigation Receiver Assembly

DESCRIPTION

• The navigation ECU sub-assembly and roof console box assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.

• Using this circuit, the navigation ECU sub-assembly sends power to the roof console box assembly (telephone microphone assembly), and the roof console box assembly (telephone microphone assembly) sends microphone signals to the navigation ECU sub-assembly.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (NAVIGATION ECU SUB-ASSEMBLY - ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))

   
   

   1. Disconnect the navigation ECU sub-assembly connector.

   2. Disconnect the roof console box 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 I67-4 (MACC) - S7-14 (MACC) Always Below 1 Ω I67-5 (MIN+) - S7-13 (MCO+) Always Below 1 Ω I67-19 (MIN-) - S7-12 (MCO-) Always Below 1 Ω I67-6 (SNS2) - S7-15 (SNS2) Always Below 1 Ω I67-4 (MACC) - Body ground Always 10 kΩ or higher I67-5 (MIN+) - Body ground Always 10 kΩ or higher I67-19 (MIN-) - Body ground Always 10 kΩ or higher I67-18 (SGND) - Body ground Always 10 kΩ or higher I67-6 (SNS2) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

2. INSPECT NAVIGATION ECU SUB-ASSEMBLY

   
   

   1. Reconnect the navigation ECU sub-assembly connector.

   2. Reconnect the roof console box assembly (telephone microphone assembly) connector.

   3. 

      Text in Illustration

      *a	Component with harness connected (Navigation ECU Sub-assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition I67-4 (MACC) - Body ground Ignition switch 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 I67-18 (SGND) - Body ground Always Below 1 Ω I67-19 (MIN-) - Body ground Always Below 1 Ω

   
   

   NG

   REPLACE NAVIGATION ECU SUB-ASSEMBLY Click here

   OK

3. INSPECT ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

   
   

   1. Disconnect the roof console box assembly (telephone microphone assembly) connector.

   2. 

      Text in Illustration

      *a	Component without harness connected (Roof Console Box Assembly (Telephone Microphone Assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition S7-15 (SNS2) - S7-12 (MCO-) Always Below 1 Ω

   
   

   NG

   REPLACE ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) Click here

   OK

4. INSPECT ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)

   
   

   1. Reconnect the navigation ECU sub-assembly connector.

   2. 

      Text in Illustration

      *a	Component with harness connected (Roof Console Box Assembly (Telephone Microphone Assembly))

      Reconnect the roof console box assembly (telephone microphone assembly) connector.

   3. Turn the ignition switch to ACC.

   4. Connect an oscilloscope to terminals 13 (MCO+) and 12 (MCO-) of the roof console box assembly (telephone microphone assembly) connector.

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

      Result
      Result Proceed to A waveform synchronized with the voice input to the roof console box assembly (telephone microphone assembly) is output A A waveform synchronized with the voice input to the roof console box assembly (telephone microphone assembly) is not output B

   
   

   B

   REPLACE ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) Click here

   A

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