Infiniti G37 Coupe. Manual - part 67

AV

DIAGNOSIS SYSTEM (AV CONTROL UNIT)

AV-21

< FUNCTION DIAGNOSIS >

[BASE AUDIO WITHOUT NAVIGATION]

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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:

• Only the control unit (AV control unit) 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 con-

trol unit internal error. 

-

If multiple errors occur at the same time for a single unit, the screen switch colors are determined accord-
ing 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.

NOTE:
Onboard self-diagnosis cannot be started when an error occurs on the dotted-line part above.

SELF-DIAGNOSIS RESULTS

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

Self-diagnosis result chart

Diagnosis results

Unit

Con-

nection 

line

Normal

Green

Green

Connection malfunction

Gray

Yellow

Unit malfunction 

Note

Red

Green

JSNIA0209GB

JSNIA0141GB

JPNIA0514GB

AV-22

< FUNCTION DIAGNOSIS >

[BASE AUDIO WITHOUT NAVIGATION]

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 “Inspection & Adjustment Mode”
screen to display the relevant trouble diagnosis screen. Press
the “RETURN” switch to return to the initial Inspection & Adjust-
ment Mode screen.

Area with yellow connection lines

Description

Possible malfunction location / Action 

to take

AV control unit malfunction is detected.

Replace the AV control unit.

“Self-Diagnosis did not run because of a control unit 
malfunction”

• Malfunction is detected in communi-

cation circuit between AV control unit 
and display unit.

• Malfunction is detected in communi-

cation signal between AV control unit 
and display unit.

Communication circuit between AV 
control unit and display unit.

•  Satellite radio tuner power supply 

and ground circuit malfunction is de-
tected.

• Malfunction is detected in communi-

cation circuits between AV control 
unit and satellite radio tuner.

• Malfunction is detected in communi-

cation signal between AV control unit 
and satellite radio tuner.

• Malfunction is detected in request 

signal circuit between AV control unit 
and satellite radio tuner.

• Satellite radio tuner power supply 

and ground

• Communication circuit between AV 

control unit and satellite radio tuner.

• Request signal circuit between AV 

control unit and satellite radio tuner.

JSNIA0211GB

JPNIA0464GB

JSNIA0212GB

JSNIA0147GB

AV

DIAGNOSIS SYSTEM (AV CONTROL UNIT)

AV-23

< FUNCTION DIAGNOSIS >

[BASE AUDIO WITHOUT NAVIGATION]

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Display Diagnosis

The tint of the color bar indication is as per the following list if RGB signal error is detected.

Vehicle Signals

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

Speaker Test

JSNIA0688GB

R (red) signal error

: Light blue (Cyan) tint

G (green) signal error

: Purple (Magenta) tint

B (blue) signal error

: Yellow tint

JSNIA0149GB

Diagnosis item

Display

Vehicle status

Remarks

Vehicle speed

ON

Vehicle speed > 0 km/h (0 MPH)

Changes in indication may be delayed. This is normal.

OFF

Vehicle speed = 0 km/h (0 MPH)

Parking brake

ON

Parking brake is applied.

OFF

Parking brake is released.

Lights

ON

Light switch ON

—

OFF

Light switch OFF

Ignition

ON

Ignition switch ON

—

OFF

Ignition switch in ACC position

Reverse

ON

Shift the selector lever to “R” posi-
tion

Changes in indication may be delayed. This is normal.

OFF

Shift the selector lever other than 
“R” position

AV-24

< FUNCTION DIAGNOSIS >

[BASE AUDIO WITHOUT NAVIGATION]

DIAGNOSIS SYSTEM (AV CONTROL UNIT)

Select “SPEAKER DIAGNOSIS” to display the Speaker Diagnosis
screen. Press “START and NEXT” to generate a test tone in a
speaker. Press “Start” to generate a test tone in the next speaker.
Press “End” to stop the test tones.
NOTE:
The frequency of test tone emitted from each speaker is as follows.

Climate Control

Refer to “HEATER & AIR CONDITIONING CONTROL SYSTEM” for details.

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 Record” to detect any error that
may have occurred before the self-diagnosis start because of this situation.
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 item
Some error items may be displayed simultaneously according to the cause. If some error items are displayed
simultaneously, the detection of the cause can be performed by the combination of display items

Tweeter

: 3 kHz

Front speaker

: 300 Hz

Rear speaker

: 1 kHz

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Display type of occur-

rence 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 the above

JSNIA0151GB