 1.CHECK CONTINUITY BETWEEN AV CONTROL UNIT AND MICROPHONE CIRCUIT
- Turn ignition switch OFF.
- Disconnect AV control unit connector and microphone connector.
- Check continuity between AV control unit harness connector terminals 26, 27, 28 and microphone harness connector terminals 4, 2, 1.
AV control unit
| Microphone
| Continuity
| Connector
| Terminals
| Connector
| Terminals
| M81
| 26
| R5
| 4
| Existed
| 27
| 2
| 28
| 1
|
- Check continuity between AV control unit harness connector terminals 26, 28 and ground.
AV control unit
| Ground
| Continuity
| Connector
| Terminals
| M81
| 26
| Not existed
| 28
|
Is the inspection result normal?
YES >>GO TO 2. NO >>Repair harness or connector.
 2.CHECK VOLTAGE MICROPHONE VCC
- Connect AV control unit connector.
- Turn ignition switch ON.
- Check voltage between AV control unit harness connector terminals 26 and 27.
(+)
| (-)
| Condition
| Voltage (Approx.)
| AV control unit
| AV control unit
| Connector
| Terminal
| Connector
| Terminal
| M81
| 26
| M81
| 27
| Ignition switch ON
| 5 V
|
Is the inspection result normal?
YES >>GO TO 3. NO >>Replace AV control unit.
 3.CHECK MICROPHONE SIGNAL
- Connect microphone connector.
- Check signal between AV control unit harness connector terminals 28 and 27.
(+)
| (-)
| Condition
| Reference value
| AV control unit
| AV control unit
| Connector
| Terminal
| Connector
| Terminal
| M81
| 28
| M81
| 27
| Give a voice
|

|
Is the inspection result normal?
YES >>Replace AV control unit. NO >>Replace microphone.
|