Nissan Sentra B18 (2020-2025) Service Manual / Driver Information & Multimedia / Audio, Visual & Navigation System :: Display Audio with 7" Color Display / Symptom Diagnosis

Nissan Sentra B18 (2020-2025) Service Manual: Symptom Diagnosis

Multi Av System

Symptom Table

Symptom Table

RELATED TO AUDIO

Symptoms	Check items	Probable malfunction location
No sound comes out or the level of the sound is low.	No sound from all speakers.	Speaker circuit shorted to ground. Refer to Wiring Diagram. AV control unit power supply and ground circuits malfunction. Refer to Diagnosis Procedure.
No sound comes out or the level of the sound is low.	Only a certain speaker (front door speaker LH, front door speaker RH, rear speaker LH, rear speaker RH) does not output sound.	Poor connector connection of speaker. Sound signal circuit malfunction between AV control unit and speaker. Refer to: Diagnosis Procedure (front door speaker). Diagnosis Procedure (rear speaker). Malfunction in speaker. Refer to: Removal and Installation (front door speaker). Removal and Installation (rear speaker). Malfunction in AV control unit. Refer to On Board Diagnosis Function.
Noise is mixed with audio.	Noise comes out from all speakers.	Malfunction in AV control unit. Refer to On Board Diagnosis Function.
	Noise comes out only from a certain speaker (front door speaker LH, front door speaker RH, rear speaker LH, rear speaker RH).	Poor connector connection of speaker. Sound signal circuit malfunction between AV control unit and speaker. Refer to: Diagnosis Procedure (front door speaker). Diagnosis Procedure (rear speaker). Malfunction in speaker. Poor Installation of speaker (e.g. backlash and looseness). Refer to: Removal and Installation (front door speaker). Removal and Installation (rear speaker). Malfunction in AV control unit. Refer to On Board Diagnosis Function.
	Noise is mixed with radio only (when the Nissan Sentra vehicle hits a bump or while driving over bad roads)	Poor connector connection of antenna or antenna feeder. Refer to Antenna and Antenna Feeder.
No radio reception or poor reception.	Any radio station cannot be received or poor reception is caused even after moving to a service area with good reception (e.g. a place with clear view and no obstacles generating external noises).	Poor connector connection of antenna or antenna feeder. Refer to Antenna and Antenna Feeder.
Buzz/rattle sound from speaker	The majority of buzz/rattle sounds are not indicative of an issue with the speaker, usually something nearby the speaker is causing the buzz/rattle.	Refer to "SQUEAK AND RATTLE TROUBLE DIAGNOSIS" in the appropriate interior trim section.

RELATED TO HANDS-FREE PHONE

Before performing diagnosis, confirm that the cellular phone being used by the customer is compatible with the Nissan Sentra vehicle.
It is possible that a malfunction is occurring due to a version change of the phone even though the phone is a compatible type. This can be confirmed by changing the cellular phone to another compatible type, and check that it operates normally. It is important to determine whether the cause of the malfunction is the Nissan Sentra vehicle or the cellular phone.

Check Compatibility

Make sure the customer’s Bluetooth^® related concern is understood.
Verify the customer’s concern.
Note:
The customer’s phone may be required, depending upon their concern.
Write down the customer’s phone brand, model and service provider.
Note:
It is necessary to know the service provider. On occasion, a given phone may be on the approved list with one provider, but may not be on the approved list with other providers.
Go to “www.nissanusa.com/bluetooth/”.
1. Using the website’s search engine, find out if the customer’s phone is on the approved list.
2. If the customer’s phone is NOT on the approved list:
  
  Stop diagnosis here. The customer needs to obtain a Bluetooth^® phone that is on the approved list before any further action.
3. If the feature related to the customer’s concern shows as “N” (not compatible):
  
  Stop diagnosis here. If the customer still wants the feature to function, they will need to get an approved phone showing the feature as “Y” (compatible) in the “Basic Features”.
4. If the feature related to the customer’s concern shows as “Y” (compatible):
  
  Perform diagnosis as per the following table.

Symptoms	Check items	Probable malfunction location
Does not recognize cellular phone connection (no connection is displayed on the display screen).	Use Enhanced Multi-Media Interface Tester (EMMIT) NI-51922 to test Bluetooth^® functionality. Refer to the EMMIT user guide for additional information. Repeat the registration of cellular phone.	Customer’s phone Malfunction in AV control unit. Replace AV control unit. Refer to Removal and Installation.
Hands-free phone cannot be established.	Hands-free phone operation can be made, but the communication cannot be established. Hands-free phone operation can be performed, however, voice between each other cannot be heard during the conversation.	Malfunction in AV control unit. Replace AV control unit. Refer to Removal and Installation.
The other party’s voice cannot be heard by hands-free phone.	Check the “microphone speaker” in Inspection & Adjustment Mode if sound is heard.
Originating sound is not heard by the other party with hands-free phone communication.	Sound operation function is normal.
	Sound operation function does not work.	Microphone signal circuit malfunction. Refer to Diagnosis Procedure.
The system cannot be operated.	The voice recognition can be controlled. Steering switch’s , , and switch works, but does not work.	Steering switch malfunction. Replace steering switch. Refer to Removal and Installation.
	Steering switch’s , , , and switches do not work.	Steering switch signal circuit malfunction. Refer to Diagnosis Procedure.
	All steering switches do not work.	Steering switch ground circuit malfunction. Refer to Diagnosis Procedure.

RELATED TO USB

Symptoms	Check items	Probable malfunction location
iPod^® or USB memory cannot be recognized.	Use Enhanced Multi-Media Interface Tester (EMMIT) NI-51922 to test USB functionality. Refer to the EMMIT user guide for additional information.	iPod^® or USB memory USB harness malfunction. USB connector malfunction.

RELATED TO AUX JACK

Symptoms	Check items	Probable malfunction location
No voice sound is heard when AUX mode is selected.	Use Enhanced Multi-Media Interface Tester (EMMIT) NI-51922 to test AUX jack functionality. Refer to the EMMIT user guide for additional information.	Auxiliary device AUX sound signal circuit.

Normal Operating Condition

Description

Description

RELATED TO NOISE

The majority of the audio concerns are the result of outside causes (bad CD, electromagnetic interference, etc.).

The following noise results from variations in field strength, such as fading noise and multi-path noise, or external noise from trains and other sources. It is not a malfunction.

Fading noise: This noise occurs because of variations in the field strength in a narrow range due to mountains or buildings blocking the signal.
Multi-path noise: This noise results from the waves sent directly from the broadcast station arriving at the antenna at a different time from the waves which reflect off mountains or buildings.

The Nissan Sentra vehicle itself can be a source of noise if noise prevention parts or electrical equipment is malfunctioning. Check if noise is caused and/or changed by engine speed, ignition switch turned to each position, and operation of each piece of electrical equipment, and determine the cause.

Note:

The source of the noise can be found easily by listening to the noise while removing the fuses of electrical components, one by one.

Type of Noise and Possible Cause

Occurrence condition		Possible cause
Occurs only when engine is ON.	A continuous growling noise occurs. The speed of the noise varies with changes in the engine speed.	Ignition components
The occurrence of the noise is linked with the operation of the fuel pump.		Fuel pump condenser
Noise only occurs when various electrical components are operating.	A cracking or snapping sound occurs with the operation of various switches.	Relay malfunction, AV control unit malfunction
	The noise occurs when various motors are operating.	Motor case ground Motor
The noise occurs constantly, not just under certain conditions.		Rear defogger coil malfunction Open circuit in printed heater Poor ground of antenna feeder line
A cracking or snapping sound occurs while the Nissan Sentra vehicle is being driven, especially when it is vibrating excessively.		Ground wire of body parts Ground due to improper part installation Wiring connections or a short circuit

RELATED TO HANDS-FREE PHONE

Symptom	Cause and Counter measure
Does not recognize cellular phone connection (No connection is displayed on the display at the guide).	Some Bluetooth^® enabled cellular phones may not be recognized by the in-Nissan Sentra vehicle phone module. Refer to “RELATED TO HANDS-FREE PHONE (Check Compatibility)” in Symptom Table.
Cannot use hands-free phone.	Customer will not be able to use a hands-free phone under the following conditions: The Nissan Sentra vehicle is outside of the telephone service area. The vehicle is in an area where it is difficult to receive radio waves; such as in a tunnel, in an underground parking garage, near a tall building or in a mountainous area. The cellular phone is locked to prevent it from being dialed. Note: While a cellular phone is connected through the Bluetooth^® wireless connection, the battery power of the cellular phone may discharge quicker than usual. The Bluetooth^® Hands-Free Phone System cannot charge cellular phones.
The other party’s voice cannot be heard by hands-free phone.	When the radio wave condition is not ideal or ambient sound is too loud, it may be difficult to hear the other person’s voice during a call.
Poor sound quality.	Do not place the cellular phone in an area surrounded by metal or far away from the in-Nissan Sentra vehicle phone module to prevent tone quality degradation and wireless connection disruption.

 Front Auxiliary Input Jacks

Diagnosis Procedure Diagnosis Procedure AUX JACK CHECK AUX JACK HARNESS CONTINUITY Ignition switch OFF. Disconnect AV control unit connector and front auxiliary input jacks conn...

 Removal and Installation

Av Control Unit Exploded View Exploded View 1. AV control unit bracket (LH) 2. AV control unit 3. AV control unit bracket (RH) Removal and Installation Removal and Installation ...

Other materials:

Knock Sensor
Component Inspection Component Inspection CHECK KNOCK SENSOR Turn ignition switch OFF. Disconnect knock sensor harness connector. Check resistance between knock sensor terminals ...

Front Camera Unit
Values on the Diagnosis Tool Values On The Diagnosis Tool Note: The following table includes information (items) inapplicable to this Nissan Sentra vehicle. For information (items) applicable to this vehicle, refer to CONSULT display items. ...

Intelligent Key Button Operation Has Poor Range (one Key)
Description Description Intelligent Key button operation has poor range. (One Intelligent Key has the symptom, other keys operate normally.) SYMPTOM TABLE (ONE INTELLIGENT KEY HAS THE SYMPTOM, OTHER KEYS OPERATE NORMALLY) ...