DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)
INSPECT MULTI-MEDIA MODULE RECEIVER ASSEMBLY
INSPECT MAP LIGHT ASSEMBLY
CHECK MAP LIGHT ASSEMBLY
CHECK TELEPHONE MICROPHONE ASSEMBLY
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.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)
|
Disconnect the F77 multi-media module receiver assembly connector.
Disconnect the R7 map light assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| F77-49 (SNS2) - R7-20 (SNS2) | Always | Below 1 Ω |
| F77-29 (MACC) - R7-25 (ACC) | Always | Below 1 Ω |
| F77-27 (MIN+) - R7-27 (MI1+) | Always | Below 1 Ω |
| F77-48 (MIN-) - R7-26 (MIC-) | Always | Below 1 Ω |
| F77-49 (SNS2) - Body ground | Always | 10 kΩ or higher |
| F77-29 (MACC) - Body ground | Always | 10 kΩ or higher |
| F77-27 (MIN+) - Body ground | Always | 10 kΩ or higher |
| F77-48 (MIN-) - Body ground | Always | 10 kΩ or higher |
| F77-28 (SGND) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 2.INSPECT MULTI-MEDIA MODULE RECEIVER ASSEMBLY
|
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 |
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 |
Text in Illustration| *a | Component with harness connected
(Multi-media Module Receiver Assembly) |
| | MULTI-MEDIA MODULE RECEIVER ASSEMBLY ()
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| 3.INSPECT MAP LIGHT ASSEMBLY
|
Remove the map light assembly ().
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| 26 (MIC-) - 20 (SNS2) | Always | Below 1 Ω |
| 4.CHECK MAP LIGHT ASSEMBLY
|
Turn the engine switch on (ACC).
Connect an oscilloscope to terminals R7-27 (MI1+) and R7-26 (MIC-) of the map light assembly connector.
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 not output. | A |
| A waveform synchronized with the voice input to the map light assembly is output. | B |
| A | |
| |
| PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE ()
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| 5.CHECK TELEPHONE MICROPHONE ASSEMBLY |
Replace the telephone microphone assembly with a new or normally functioning one ().
Check if the same malfunction recurs.
Result| Result | Proceed to |
Malfunction does not recur
(returns to normal). | A |
| Malfunction recurs. | B |
| | REPLACE MAP LIGHT ASSEMBLY ()
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| A | |
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| END (TELEPHONE MICROPHONE ASSEMBLY IS DEFECTIVE) |
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