DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT RADIO RECEIVER ASSEMBLY
CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - RADIO RECEIVER ASSEMBLY)
INSPECT MAP LIGHT ASSEMBLY
INSPECT MAP LIGHT ASSEMBLY
REPLACE TELEPHONE MICROPHONE ASSEMBLY
AUDIO AND VISUAL SYSTEM (w/o Navigation System) - Microphone Circuit between Microphone and Radio Receiver
DESCRIPTION
This circuit sends the microphone signal from the map light assembly (telephone microphone assembly) to the radio receiver assembly.
It also supplies power source from the radio receiver assembly to the map light assembly (telephone microphone assembly).
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.INSPECT RADIO RECEIVER ASSEMBLY |
Disconnect the F54 radio receiver assembly connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| F54-3 (MACC) - Body ground | Engine switch on (IG) | 4 to 6 V |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| F54-6 (SGND) - Body ground | Always | Below 1 Ω |
| F54-5 (MIN-) - Body ground | Always | Below 1 Ω |
Text in Illustration| *1 | Component without harness connected
(Radio Receiver Assembly) |
| | REPLACE RADIO RECEIVER ASSEMBLY ()
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| 2.CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - RADIO RECEIVER ASSEMBLY) |
Disconnect the R7 map light assembly and F54 radio receiver assembly connectors.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| R7-20 (SNS2) - F54-1 (SNS2) | Always | Below 1 Ω |
| R7-27 (MI1+) - F54-2 (MIN+) | Always | Below 1 Ω |
| R7-26 (MIC-) - F54-5 (MIN-) | Always | Below 1 Ω |
| R7-25 (ACC) - F54-3 (MACC) | Always | Below 1 Ω |
| R7-20 (SNS2) - Body ground | Always | 10 kΩ or higher |
| R7-27 (MI1+) - Body ground | Always | 10 kΩ or higher |
| R7-26 (MIC-) - Body ground | Always | 10 kΩ or higher |
| R7-25 (ACC) - Body ground | Always | 10 kΩ or higher |
| F54-6 (SGND) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 3.INSPECT MAP LIGHT ASSEMBLY |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| R7-20 (SNS2) - R7-26 (MIC-) | Always | Below 1 Ω |
Text in Illustration| *1 | Component without harness connected
(Map Light Assembly) |
| 4.INSPECT MAP LIGHT ASSEMBLY |
Reconnect the radio receiver assembly connector.
Reconnect the map light assembly connector.
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 an oscilloscope.
Result| Result | Proceed to |
| A waveform synchronized with the voice input to the telephone microphone assembly is output | A |
| A waveform synchronized with the voice input to the telephone microphone assembly is not output | B |
Text in Illustration| *1 | Component with harness connected
(Map Light Assembly) |
| A | |
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| PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE ()
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| 5.REPLACE TELEPHONE MICROPHONE ASSEMBLY |
Replace the telephone microphone assembly ().
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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