Navigation System Microphone Circuit Between Microphone And Radio Receiver

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY

INSPECT MAP LIGHT ASSEMBLY

CHECK MAP LIGHT ASSEMBLY

CHECK TELEPHONE MICROPHONE ASSEMBLY

DESCRIPTION

1. 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.
   
2. 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.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System (Click here).

1. Disconnect the F77 multi-media module receiver assembly connector.
   

2. Disconnect the R7 map light assembly connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   F77-27 (MIN+) - R7-27 (MI1+)	Always	Below 1 Ω
   F77-29 (MACC) - R7-25 (ACC)	Always	Below 1 Ω
   F77-48 (MIN-) - R7-26 (MIC-)	Always	Below 1 Ω
   F77-49 (SNS2) - R7-20 (SNS2)	Always	Below 1 Ω
   F77-27 (MIN+) - Body ground	Always	10 kΩ or higher
   F77-28 (SGND) - Body ground	Always	10 kΩ or higher
   F77-29 (MACC) - Body ground	Always	10 kΩ or higher
   F77-48 (MIN-) - Body ground	Always	10 kΩ or higher
   F77-49 (SNS2) - Body ground	Always	10 kΩ or higher

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   F77-29 (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
   F77-28 (SGND) - Body ground	Always	Below 1 Ω
   F77-48 (MIN-) - Body ground	Always	Below 1 Ω

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 (SNS2) - 26 (MIC-)	Always	Below 1 Ω

1. Turn the engine switch on (ACC).
   

2. Connect an oscilloscope to terminals R7-27 (MI1+) and R7-26 (MIC-) of the map light assembly connector.
   

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

   Text in Illustration

   *a	Component with harness connected (Map Light Assembly)

   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

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