Nissan Sentra B18 (2020-2025) Service Manual: Microphone Signal Circuit
Diagnosis Procedure
-
CHECK HARNESS BETWEEN AV CONTROL UNIT AND MICROPHONE
-
-
Ignition switch OFF.
-
Disconnect AV control unit connector and microphone connector.
-
Check continuity between AV control unit connector and microphone connector.
AV control unit
Microphone
Continuity
Connector
Terminal
Connector
Terminal
M93
34
R17
4
Yes
43
5
53
1
54
2
-
Check continuity between AV control unit connector and ground.
AV control unit
—
Continuity
Connector
Terminal
M93
34
Ground
No
43
53
-
Is the inspection result normal?
YES >>GO TO 2.
NO >>Repair harness or connectors.
-
-
CHECK MICROPHONE POWER SUPPLY
-
-
Connect AV control unit connector and microphone connector.
-
Ignition switch ON.
-
Check voltage between microphone connector and ground.
Microphone
(-)
Voltage
(Approx.)
(+)
Connector
Terminal
R17
4
Ground
5 V
-
Is the inspection result normal?
YES >>GO TO 3.
NO >>Replace AV control unit. Refer to Removal and Installation.
-
-
CHECK MICROPHONE SIGNAL
-
Check signal between terminals of AV control unit connector.
AV control unit
Condition
Reference value
Connector
(+)
(-)
Terminal
Terminal
M93
53
54
Speak into microphone.
Is the inspection result normal?
YES >>Replace AV control unit. Refer to Removal and Installation.
NO >>Replace microphone. Refer to Removal and Installation.
-
Steering Switches
Diagnosis Procedure
Diagnosis Procedure
CHECK STEERING WHEEL AUDIO CONTROL
SWITCH RESISTANCE
Ignition switch OFF.
...
Front Auxiliary Input Jacks
Diagnosis Procedure
Diagnosis Procedure
AUX JACK
CHECK AUX JACK HARNESS
CONTINUITY
Ignition switch OFF.
...
Other materials:
Refrigerant pressure sensor
Component Function Check
1.CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION
Start engine and warm it up to normal operating temperature.
Turn A/C switch and blower fan switch ON.
Check the voltage between ECM harness connector terminals.
Is the inspection result normal?
YES >> ...
How to erase permanent DTC
Description
OUTLINE
When a DTC is stored in ECM
When a DTC is stored in ECM and MIL is ON, a permanent DTC is erased with MIL
shutoff if the same malfunction
is not detected after performing the driving pattern for MIL shutoff three times
in a raw.
*1: When the same malfunction is detec ...
Engine cooling system
The engine cooling system is filled at the factory
with a pre-diluted mixture of 50% Genuine
NISSAN Long Life Antifreeze/Coolant (blue) and
50% water to provide year-round anti-freeze and
coolant protection. The antifreeze solution contains
rust and corrosion inhibitors. Additional engine
cool ...
