Diagnosis Procedure
WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
For Wiring Diagram information, refer to appropriate wiring diagram.
- CHECK MICROPHONE SIGNAL CIRCUIT CONTINUITY
- Turn ignition switch OFF.
- Disconnect audio unit connector M175 and microphone connector R5.
- Check continuity between audio unit connector M175 and microphone connector R5.
Audio unit
Microphone
Continuity
Connector
Terminal
Connector
Terminal
M175
37
R5
1
Yes
38
4
39
2
- Check continuity between audio unit connector M175 and ground.
Audio unit
Ground
Continuity
Connector
Terminal
M175
37
-
No
38
39
Is inspection result normal?
YES
GO TO 2 .
NO
Repair or replace harness or connectors.
- CHECK MICROPHONE VCC VOLTAGE
- Connect audio unit connector M175.
- Turn ignition switch ON.
- Check voltage between terminals of audio unit connector M175.
Audio unit connector M175
Voltage
(Approx.)
(+)
(-)
Terminal
Terminal
38
39
5.0 V
Is the inspection result normal?
YES
GO TO 3.
NO
Replace audio unit. Refer to Removal and Installation .
- CHECK MICROPHONE SIGNAL
- Connect microphone connector R5.
- Check signal between terminals of audio unit connector M175.
Audio unit connector M175
Condition
Reference value
(+)
(-)
Terminal
Terminal
37
39
Speak into microphone.
Is the inspection result normal?
YES
Replace audio unit. Refer to Removal and Installation .
NO
Replace microphone. Refer to Removal and Installation .