Nissan Quest E52. Manual - part 45

AV

SYSTEM

AV-59

< SYSTEM DESCRIPTION >

[DISPLAY AUDIO]

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DISPLAY AUDIO SYSTEM : Circuit Diagram

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AV-60

< SYSTEM DESCRIPTION >

[DISPLAY AUDIO]

DIAGNOSIS SYSTEM (AUDIO UNIT)

DIAGNOSIS SYSTEM (AUDIO UNIT)

Description

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The audio unit diagnosis function starts up with audio switch operation and the audio unit performs a diagnosis
for each unit in the system during the on board diagnosis.

On Board Diagnosis Function

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ON BOARD DIAGNOSIS

• The trouble diagnosis function has a self-diagnosis mode for conducting trouble diagnosis automatically and

a confirmation/adjustment mode for operating manually.

• Self-diagnosis mode performs the audio unit diagnosis, and it indicates the results to the display.
• The confirmation/adjustment mode allows the technician to check, modify or adjust the vehicle signals and

set values, as well as to monitor the system error records. The checking, modifying or adjusting generally
require human intervention and judgment (the system cannot make judgment automatically). 

On Board Diagnosis Item

STARTING PROCEDURE

1.

Start the engine.

2.

Turn the audio system OFF.

3.

While pressing the “1” button, turn the volume control dial clock-
wise or counterclockwise for 40 clicks or more. (When the self-
diagnosis mode is started, a short beep will be heard.)

4.

Shifting from current screen to system initial screen is performed by pressing “iPod MENU” button.

Mode

Description

Self Diagnosis

Audio unit diagnosis.

Confirmation/

Adjustment

Display Diagnosis

The following check functions are available: color tone check by color bar 
display, light and shade check by gray scale display.

Vehicle Signals

Diagnosis of signals can be performed for vehicle speed, lights, reverse 
and vehicle recognition.

Speaker Test

The connection of a speaker can be confirmed by test tone.

Error History

The system malfunction and the frequency when occurring in the past are 
displayed. When the malfunctioning item is selected, the time and place 
that the selected malfunction last occurred are displayed.

Camera System

Guiding line position that overlaps rear view camera image can be adjust-
ed. (without around view monitor)

AV COMM Diagnosis

The communication condition of each unit of display audio system can be 
monitored.

Delete Unit Connection Log

Not used for this vehicle.

Initialize Setting

Initializes the audio unit memory.

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AV

DIAGNOSIS SYSTEM (AUDIO UNIT)

AV-61

< SYSTEM DESCRIPTION >

[DISPLAY AUDIO]

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5.

The trouble diagnosis initial screen is displayed, and then the
items of “Self Diagnosis” and “Confirmation/Adjustment” can be
selected.

SELF-DIAGNOSIS MODE

1.

Start the self-diagnosis function and select “Self Diagnosis”.

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Self-diagnosis subdivision screen is displayed, and the self-diagnosis mode starts.

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The bar graph visible on the center of the self-diagnosis subdivision screen indicates progress of the trou-
ble diagnosis.

2.

Diagnosis results are displayed after the self-diagnosis is com-
pleted. The unit names and the connection lines are color-coded
according to the diagnostic results.

NOTE:
Control unit (audio unit) and is displayed in red.
• Replace audio unit if “Self-Diagnosis did not run because of a control unit malfunction” is indicated. The

symptom is audio unit internal error. Refer to 

AV-112, "Removal and Installation"

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• If multiple errors occur at the same time for a single unit, the screen switch colors are determined

according to the following order of priority: red > gray.

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The comments of the self-diagnosis results can be viewed with a
component in the diagnosis result screen.

Detection Range of Self-diagnosis Mode

• The self-diagnosis mode allows the technician to diagnose the connection in the communication line

between audio unit and each unit and the internal operation of the audio unit.

• If there is malfunction to the switch of the audio unit because the start condition of the diagnosis function is

switch operation, the on board diagnosis function cannot be started.

SELF-DIAGNOSIS RESULTS

Check the applicable display at the following table, and then repair the malfunctioning parts.

Only Unit Part Is Displayed In Red.

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Diagnosis results

Unit

Connec-

tion line

Normal

Green

Green

Connection malfunction

Gray

Yellow

Unit malfunction 

Note

Red

Green

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AV-62

< SYSTEM DESCRIPTION >

[DISPLAY AUDIO]

DIAGNOSIS SYSTEM (AUDIO UNIT)

A Connecting Cable Between Units Is Displayed In Yellow.

CONFIRMATION/ADJUSTMENT MODE

1.

Start the diagnosis function and select “Confirmation/Adjustment”. The confirmation/adjustment mode
indicates where each item can be checked or adjusted.

2.

Select each switch on the “Confirmation/Adjustment Mode”
screen to display the relevant trouble diagnosis screen. Press
the “iPod MENU” switch to return to the initial Confirmation/
Adjustment mode screen.

Display Diagnosis

Vehicle Signals

Screen switch

Description

Possible malfunction location / Action to 

take

Control unit

Malfunction is detected in audio unit power 
supply and ground circuits.

Check audio unit power supply and ground 
circuits. When detecting no malfunction in 
those components, replace audio unit. Re-
fer to 

AV-112, "Removal and Installation"

.

Area with yellow connection lines

Description

Possible malfunction location / Action to 

take

Control unit 

⇔

 BTHF

When either one of the following items is 
detected:
• TEL adapter unit power supply and 

ground circuits are malfunctioning.

• AV communication circuits between au-

dio unit and TEL adapter unit are mal-
functioning.

• TEL adapter unit power supply and 

ground circuits.

• AV communication circuits between au-

dio unit and TEL adapter unit.

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