AV CONTROL UNIT : Diagnosis Description

WARNING: This page is about a different car, the 2010 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

DESCRIPTION

Diagnosis function consists of the "Self-Diagnosis" mode performed automatically and the "Confirmation/Adjustment" mode operated manually.
"Self-Diagnosis" mode checks for connections between the units constituting this system, analyzes each individual unit at the same time, and displays the results on the LCD screen.
"Confirmation/Adjustment" mode is used to perform trouble diagnosis that requires operation and judgment by an operator (trouble that cannot be automatically judged by the system), to check/change the set value, and to display the error history of the AV control unit.

DIAGNOSIS ITEM

MODE DESCRIPTION

Mode			Description
Self-diagnosis			AV control unit diagnosis Analyzes connection between the AV control unit, front display, Bluetooth, satellite tuner, switches and rear view camera control unit.
CONFIRMATION/ADJUSTMENT	Display diagnosis	Color spectrum bar	Color tone of the screen can be checked by the display of a color bar.
	Display diagnosis	Gradation bar	Shading of the screen can be checked by the display of a gray scale.
	Vehicle signals		The following vehicle signals are analyzed: Vehicle speed signal, parking brake signal, light signal, ignition switch signal, and reverse signal.
	Speaker test		Connection can be checked by sending a test tone to each speaker.
	Climate control		Start auto air conditioner self-diagnosis
	Error history		Diagnosis results previously stored in the memory are displayed in this mode.
	Vehicle CAN diagnosis		The transmitting/receiving of CAN communication can be monitored.
	AV COMM diagnosis		The transmitting/receiving of AV communication can be monitored.
	Delete unit connection log		Erase the error history and connection history of the unit.
	Initialize settings		All audio settings are reset to default levels.

OPERATION PROCEDURE

Start the engine.
Turn the audio system off.
While pressing the "SETTING" button, turn the volume control dial counterclockwise 30 clicks or more.

Fig 1: Identifying Setting Button
Courtesy of NISSAN MOTOR CO., U.S.A.
The initial trouble diagnosis screen will be displayed, and items "Self-Diagnosis" and "Confirmation/Adjustment" can be selected.

Fig 2: Screen Display - System Diagnostic Menu
Courtesy of NISSAN MOTOR CO., U.S.A.

SELF-DIAGNOSIS

Perform self-diagnosis by selecting "Self-Diagnosis".
- Self-diagnosis subdivision screen is displayed, and the self-diagnosis mode starts.
- A bar graph visible on the center of the self-diagnosis subdivision screen indicates progress of the trouble diagnosis.
NOTE: Self-diagnosis requires approximately 10 seconds to complete.

Fig 3: Screen Display - Running Self Diagnosis
Courtesy of NISSAN MOTOR CO., U.S.A.

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

DIAGNOSIS RESULTS REFERENCE

Diagnosis results

Unit

Connection line

Normal

Green

Connection malfunction

Gray

Yellow

Unit malfunction ⁽¹⁾

Red

Green

⁽¹⁾	Only the AV control unit is displayed in red.

If multiple malfunctions occur at the same time for a single unit, the screen switch colors are determined according to the following order of priority: red > yellow > gray.

Fig 4: Screen Display - Diagnosis Results

Courtesy of NISSAN MOTOR CO., U.S.A.

Select a component on the "Self Diagnosis" screen and comments for the diagnosis results will be shown.

Fig 5: Screen Display - Self Diagnosis
Courtesy of NISSAN MOTOR CO., U.S.A.

Self-Diagnosis Results

PART DESCRIPTION

Area with yellow connection lines	Description	Possible malfunction location/Action to take
Courtesy of NISSAN MOTOR CO., U.S.A.	AV control unit malfunction is detected	Replace the AV control unit. Refer to "REMOVAL AND INSTALLATION ".
Courtesy of NISSAN MOTOR CO., U.S.A.	Poor connection is detected for the display unit	Harness or connector AV control unit Display unit
Courtesy of NISSAN MOTOR CO., U.S.A.	Switch malfunction is detected	Perform A/C and AV switch assembly diagnostics. Refer to "A/C AND AV SWITCH ASSEMBLY : COMPONENT FUNCTION CHECK ".
Courtesy of NISSAN MOTOR CO., U.S.A.	Poor connection is detected for the satellite radio tuner.	Harness or connector AV control unit Satellite radio tuner
Courtesy of NISSAN MOTOR CO., U.S.A.	Poor connection is detected for the rear audio remote control unit.	Harness or connector AV control unit Rear audio remote control unit

CONFIRMATION/ADJUSTMENT MODE

Start the diagnosis function and select "Confirmation/Adjustment". The confirmation/adjustment mode indicates where each item can be checked or adjusted.
Select each item on the "Confirmation/Adjustment" mode screen to display the relevant trouble diagnosis screen. Press the "BACK" button or touch "BACK" on the touch screen to return to the initial Confirmation/Adjustment Mode screen.

Fig 6: Screen Display - Vehicle Diagnosis
Courtesy of NISSAN MOTOR CO., U.S.A.

Display Diagnosis

Fig 7: Screen Display - Color Spectrum Bar

Courtesy of NISSAN MOTOR CO., U.S.A.

Vehicle Signals

A comparison check can be made of each actual vehicle signal and the signals recognized by the system.

Fig 8: Screen Display - Vehicle Signals

Courtesy of NISSAN MOTOR CO., U.S.A.

VEHICLE STATUS CHART

Diagnosis item	Display	Vehicle status	Remarks
Vehicle speed	ON	Vehicle speed > 0 km/h	Changes in indication may be delayed by approximately 1.5 seconds. This is normal.
	OFF	Vehicle speed = 0 km/h
	-	Ignition switch in ACC position
Parking brake	ON	Parking brake is applied.
Parking brake	OFF	Parking brake is released.
Lights	ON	Light switch ON	Block the light beam from the auto light optical sensor.
Lights	OFF	Light switch OFF	Block the light beam from the auto light optical sensor.
Ignition	ON	Ignition switch ON	-
Ignition	OFF	Ignition switch in ACC position	-
Reverse	ON	Selector lever in R position	Changes in indication may be delayed by approximately 1.5 seconds. This is normal.
	OFF	Selector lever in any position other than R
	-	Ignition switch in ACC position

Speaker Test

Select "Speaker Test" to display the speaker diagnosis screen. Press "Start" to generate a test tone in speakers. Touch "End" to stop the test tones.

Fig 9: Screen Display - Speaker Setting

Courtesy of NISSAN MOTOR CO., U.S.A.

Error History

The self-diagnosis results are judged depending on whether any error occurs from when "Self-diagnosis" is selected until the self-diagnosis results are displayed.

However, the diagnosis results are judged normal if an error has occurred before the ignition SW is turned ON and then no error has occurred until the self-diagnosis start. Check the "Error History" to detect any error that may have occurred before the self-diagnosis start because of this situation.

Fig 10: Screen Display - Switches Connection Error

Courtesy of NISSAN MOTOR CO., U.S.A.

Count up method A

The counter resets to 0 if an error occurs when IGN switch is turned ON. The counter increases by 1 if the condition is normal at a next IGN ON cycle.
The counter upper limit is 39. Any counts exceeding 39 are ignored. The counter can be reset (no error-record display) with the "Delete log" switch or CONSULT-III.

Count up method B

The counter increases by 1 if an error occurs when IGN switch is ON. The counter will not decrease even if the condition is normal at the next IGN ON cycle.
The counter upper limit is 50. Any counts exceeding 50 are ignored. The counter can be reset (no error-record display) with the "Delete log" switch or CONSULT-III.

ERROR HISTORY DISPLAY ITEM CHART

Display method of occurrence frequency	Error history display item
Count up method A	CAN communication line, control unit (CAN), AV communication line, control unit (AV communication)
Count up method B	Other than above

Vehicle CAN Diagnosis

CAN communication status and error counter is displayed.
The error counter displays "OK" if any malfunction was not detected in the past and displays "0" if a malfunction is detected. It increases by 1 if the condition is normal at the next ignition switch ON cycle. The upper limit of the counter is 39.
The error counter is erased if reset.

Fig 11: Screen Display - Vehicle CAN Diagnosis
Courtesy of NISSAN MOTOR CO., U.S.A.

AV COMM Diagnosis

AV communication status and error counter is displayed.
The error counter displays "OK" if any malfunction was not detected in the past and displays "0" if a malfunction is detected. It increases by 1 if the condition is normal at the next ignition switch ON cycle. The upper limit of the counter is 39.
The error counter is erased if reset.

Fig 12: Screen Display - AV COMM Diagnosis
Courtesy of NISSAN MOTOR CO., U.S.A.

Delete Unit Connection Log

Deletes any unit connection records and error records from the AV control unit memory. (Clear the records of the unit that has been removed)

Fig 13: Screen Display - Delete Connection Log

Courtesy of NISSAN MOTOR CO., U.S.A.

Inititialize Settings

Initializes the AV control unit memory.

Fig 14: Screen Display - AV Control Unit Memory

Courtesy of NISSAN MOTOR CO., U.S.A.