Nissan Quest E52. Manual - part 67

AV

DIAGNOSIS SYSTEM (AV CONTROL UNIT)

AV-147

< SYSTEM DESCRIPTION >

[BASE AUDIO WITH SEPARATE DISPLAY]

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DIAGNOSIS SYSTEM (AV CONTROL UNIT)

Description

INFOID:0000000009652009

• The AV control unit diagnosis function starts up with multifunction switch operation and the AV control unit

performs a diagnosis for each unit in the system during the on board diagnosis.

• Perform a CONSULT diagnosis if the on board diagnosis does not start, e.g., the screen does not display

anything, the multifunction switch does not function, etc.

On Board Diagnosis Function

INFOID:0000000009652010

MULTIFUNCTION SWITCH AND PRESET SWITCH SELF-DIAGNOSIS FUNCTION

The ON/OFF operation (continuity) of each switch in the multifunction switch and preset switch can be
checked.

Self-diagnosis Mode

•

Press the “BACK” switch and the “UP” switch of the 4-direction
switches within 10 seconds after turning the ignition switch from
OFF to ACC and hold them for 3 seconds or more. Then the
buzzer sounds, all indicators of the preset switch illuminate, and
the self-diagnosis mode starts.

• The continuity of each switch at the ON position can be checked

by pressing the switch. The buzzer sounds if the switch is normal.
NOTE:
The disk eject switch cannot be checked.

Finishing Self-diagnosis Mode

Self-diagnosis mode is canceled when turning the ignition switch OFF.

ON BOARD DIAGNOSIS

Description

• 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 AV control unit diagnosis and the connection diagnosis between each of

the units that make up the system, and it indicates the results to the front display unit.

• 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 and system communication status. The checking,
modifying or adjusting generally require human intervention and judgment (the system cannot make judg-
ment automatically). 

On Board Diagnosis Item

JSNIA4238ZZ

Mode

Description

Self Diagnosis

• AV control unit diagnosis.
• Diagnoses the connections across system components, between AV 

control unit and each unit.

AV-148

< SYSTEM DESCRIPTION >

[BASE AUDIO WITH SEPARATE DISPLAY]

DIAGNOSIS SYSTEM (AV CONTROL UNIT)

METHOD OF STARTING

1.

Start the engine.

2.

Turn the audio system OFF.

3.

While pressing the “SETTING” button, turn the volume control
dial clockwise or counterclockwise for 40 clicks or more. (When
the self-diagnosis mode is started, the trouble diagnosis initial
screen is displayed.)
• Shifting from current screen to previous screen is performed

by pressing “BACK” button.

4.

Items of “Self Diagnosis” and “Confirmation/Adjustment” can be
selected on the trouble diagnosis initial screen.

SELF-DIAGNOSIS MODE

1.

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

-

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

-

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

Confirmation/

Adjustment

Display Diagnosis

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

Vehicle Signals

Diagnosis of signals can be performed for vehicle speed, parking brake, 
lights, ignition and reverse.

Speaker Test

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

Climate Control

Start auto air conditioner system self-diagnosis.

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 Cont.

• Guiding line position that overlaps rear view camera image can be ad-

justed.

• Configuration stored in the AV control unit can be checked.

Vehicle CAN Diagnosis

The transmitting/receiving of CAN communication can be monitored.

AV COMM Diagnosis

The communication condition of each unit of Multi AV system can be mon-
itored.

Delete Unit Connection Log

Erase the connection history of unit and error history.

Initialize Settings

Initializes the AV control unit memory.

Mode

Description

JSNIA4239ZZ

SKIB3961E

AV

DIAGNOSIS SYSTEM (AV CONTROL UNIT)

AV-149

< SYSTEM DESCRIPTION >

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

symptom is AV control unit internal error. Refer to 

AV-250, "Removal and Installation"

.

• 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.

- 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 AV control unit and each unit and the internal operation of the AV control unit.

• Because the start condition of diagnosis function is a switch operation, the on board diagnosis function can-

not be started up if any malfunction is detected in the communication circuit between AV control unit and
multifunction switch.

SELF-DIAGNOSIS RESULTS

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

Only Unit Part Is Displayed In Red.

A Connecting Cable Between Units Is Displayed In Yellow.

Diagnosis results

Unit

Connec-

tion line

Normal

Green

Green

Connection malfunction

Gray

Yellow

Unit malfunction 

Note

Red

Green

JSNIA4240ZZ

JSNIA0141GB

Screen switch

Description

Possible malfunction location / Action to 

take

Control unit

Malfunction is detected in AV control unit 
power supply and ground circuits.

Check AV control unit power supply and 
ground circuits. When detecting no mal-
function in those components, replace AV 
control unit.
Refer to 

AV-250, "Removal and Installation"

AV-150

< SYSTEM DESCRIPTION >

[BASE AUDIO WITH SEPARATE DISPLAY]

DIAGNOSIS SYSTEM (AV CONTROL UNIT)

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 “BACK” switch to return to the initial Confirmation/Adjust-
ment Mode screen.

Area with yellow connection lines

Description

Possible malfunction location / Action to 

take

Control unit 

⇔

 Front display

Serial communication circuits between AV 
control unit and front display unit are mal-
functioning.

Serial communication circuits between AV 
control unit and front display unit.

Control unit 

⇔

 SAT

When either one of the following items are 
detected:
• satellite radio tuner power supply and 

ground circuits are malfunctioning.

• communication circuits between AV con-

trol unit and satellite radio tuner are mal-
functioning.

• request signal circuit between AV control 

unit and satellite radio tuner are malfunc-
tioning.

• Satellite radio tuner power supply and 

ground circuit.
Refer to 

AV-215, "SATELLITE RADIO 

TUNER : Diagnosis Procedure"

.

• Communication circuit between AV con-

trol unit and satellite radio tuner.

• Request signal circuit between AV con-

trol unit and satellite radio tuner.

Control unit 

⇔

 BTHF

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

ground circuit are malfunctioning.

• AV communication circuits between AV 

control unit and TEL adapter unit are 
malfunctioning.

• TEL adapter unit power supply and 

ground circuits.
Refer to 

AV-216, "TEL ADAPTER UNIT : 

Diagnosis Procedure"

.

• AV communication circuits between AV 

control unit and TEL adapter unit.

Control unit 

⇔

 Video Dist.(Rear)

When either one of the following items are 
detected:
• Rear display unit power supply and 

ground circuits are malfunctioning.

• AV communication circuits between AV 

control unit and rear display unit are mal-
functioning.

• Rear display unit power supply and 

ground circuits.
Refer to 

AV-214, "REAR DISPLAY UNIT 

: Diagnosis Procedure"

.

• AV communication circuits between AV 

control unit and rear display unit.

JSNIA0147GB