AUDIO AND VISUAL SYSTEM (for Radio and Display Type) Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

• The radio and display receiver 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 radio and display receiver 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 radio and display receiver assembly.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - ROOF CONSOLE BOX ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY))

   
   

   1. Disconnect the radio and display receiver 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 I155-6 (SNS2) - S7-15 (SNS2) Always Below 1 Ω I155-4 (MACC) - S7-14 (MACC) Always Below 1 Ω I155-5 (MIN+) - S7-13 (MCO+) Always Below 1 Ω I155-19 (MIN-) - S7-12 (MCO-) Always Below 1 Ω I155-6 (SNS2) - Body ground Always 10 kΩ or higher I155-4 (MACC) - Body ground Always 10 kΩ or higher I155-5 (MIN+) - Body ground Always 10 kΩ or higher I155-19 (MIN-) - Body ground Always 10 kΩ or higher I155-18 (SGND) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

2. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

   
   

   1. Reconnect the radio and display receiver assembly connector.

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

   3. 

      Text in Illustration

      *a	Component with harness connected (Radio and Display Receiver Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition I155-4 (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 I155-18 (SGND) - Body ground Always Below 1 Ω I155-19 (MIN-) - Body ground Always Below 1 Ω

   
   

   NG

   REPLACE RADIO AND DISPLAY RECEIVER 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 radio and display receiver assembly connector.

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

   3. Turn the ignition switch to ACC.

   4. 

      Text in Illustration

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

      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