Infiniti F50. Manual - part 165

AUDIO

AV-25

C

D

E

F

G

H

I

J

L

M

A

B

AV

DIAGNOSIS ITEM 

Self-Diagnosis Mode

EKS001FA

OPERATION PROCEDURE 

●

To start the self-diagnosis mode and to check the diagnosis result, refer to 

AV-78, "Self-Diagnosis Mode"

for models with navigation system, and 

DI-109, "Self-Diagnosis Mode"

  for vehicles without navigation

system.

Confirmation/Adjustment Mode (without navigation system)

EKS006RL

OPERATION PROCEDURE 

1.

Start the engine.

2.

Turn the audio system off.

3.

While pressing the “INFO” switch, turn the volume control dial
clockwise or counterclockwise for 30 clicks or more. (When self-
diagnosis mode is aggravated, a short beep will be heard.)

●

To return to the previous screen, press “PREV” switch.

4.

The initial trouble diagnosis screen will be shown, and items
“Self-Diagnosis” and “Confirmation/Adjustment” will become
selective.

5.

When “Confirmation/Adjustment” is selected on the trouble diag-
nosis screen, the operation will enter the Confirmation/Adjust-
ment mode. In this mode, check and adjustment of each item
will become possible.

Mode

Description

Self-diagnosis

●

Check connection among AV and NAVI control unit or AV control unit and audio 
unit and CD Auto changer.

●

Perform the unit diagnosis of audio unit and CD auto changer.

Confirmation/Adjustment 
(without navigation system)

Speaker diagnosis

●

Check the connection of each speaker using a test tone.

SKIA3512E

SKIA0381E

SKIA0361E

AV-26

AUDIO

6.

When “Speaker Test” is selected, the speaker diagnosis screen
will be shown. Then press “Start/Next” and the test tone will be
emitted from one speaker. Press “Start/Next” again and the test
tone will be emitted from another speaker. Press “Stop” and the
test tone will be stopped.

NOTE:
Test tones emitted from each speaker are as follows.

Trouble Diagnosis

EKS000XY

●

The majority of the audio troubles are the result of outside causes (bad CD/cassette, electromagnetic
interference, etc.). Check the inspection items below to diagnose the malfunction.

MALFUNCTION  WITH RADIO, TAPE  AND CD

FOR RADIO ONLY 

Instrument 
speaker

:1 KHz

Door speaker

:1 KHz

Woofer

:100 Hz

SKIA3669E

Symptom

Check items

Possible cause

Inoperative

●

Make sure the ignition switch is in the ACC position.

●

Audio unit

●

Audio unit power supply circuit. Refer 
to 

AV-29, "Power Supply Circuit 

Inspection"

 .

No sound

●

Make sure the volume is not turned down.

●

Make sure the balance and fader control knobs are 
centered.

●

Audio unit

●

Audio unit power supply circuit. Refer 
to 

AV-29, "Power Supply Circuit 

Inspection"

 .

●

Speaker

●

Sound signal circuit between speaker 
and audio unit

Poor sound

●

Make sure the bass and treble adjustment knobs are 
centered.

●

Audio unit

●

CD auto changer

●

Speaker

●

BOSE speaker amp.

Noisy

-

●

Audio unit

●

CD auto changer

●

Each electrical equipment

●

BOSE speaker amp.

Symptom

Check items

Possible cause

No sound

●

Make sure the radio is tuned to a station's frequency.

●

Audio unit

●

Antenna feeder

●

Antenna amplifier

●

Glass antenna

AUDIO

AV-27

C

D

E

F

G

H

I

J

L

M

A

B

AV

NOTE:
1.

The cause is a reduction in the receiving sensitivity of the window antenna.

2.

This is noise resulting from variations in field strength, such as fading noise and multi-path noise, or exter-
nal 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 moun-
tains 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 of mountains or buildings.

FOR CASSETTE PLAYER ONLY

Noisy

●

Make sure the radio is tuned to a station's frequency.

●

Make sure the signal of the received station is not 
weak.

●

Make sure no mirror-type window film nor any metal 
object (after-market antenna, etc.) is attached on the 
rear window glass (Note 1).

●

Check whether or not the malfunction occurs only in 
a particular area.  (Note 2)

●

Audio unit

●

Antenna feeder

●

Antenna amplifier

●

window antenna

●

Noise prevention parts

●

Each electrical equipment

●

Wire harness of each piece of electri-
cal equipment

Selected radio stations stored in 
memory are deleted

-

●

Audio unit

●

Audio unit power supply circuit. Refer 
to 

AV-29, "Power Supply Circuit 

Inspection"

 .

Symptom

Check items

Possible cause

Symptom

Check items

Possible cause

Cassette tape cannot be inserted.

●

Make sure a cassette tape is not already inserted.

●

Make sure the cassette has no deformation or other malfunction.

Audio unit,  audio unit 
power circuit

Cassette tape cannot be ejected.

●

Make sure the cassette has no deformation or other malfunction.

●

Make sure the cassette tape does not sag.

Auto reverse does not work, or the 
tape direction changes in the middle 
of play.

●

There is a malfunction with tape winding. Make sure there is no 
slack or other malfunction.

●

Make sure an old cassette tape is not being used.

Audio unit

There is much noise.

●

Make sure that  the cassette tape itself does not have a lot of 
noise, or that the tape does not have a low recording level.

The sound is not clear.

●

Make sure the tune is recorded on tape with Dolby B NR OFF and 
played with Dolby B NR ON.

●

Make sure the sound quality of the cassette tape itself is not poor.

Sound fluctuates/tape speed not cor-
rect

●

Make sure there is no tape winding malfunction, sagging, stretch-
ing, or other malfunction.

●

Make sure there is no malfunction with the recording speed of the 
cassette tape.

No sound.

●

Make sure the cassette tape has been recorded on.

AV-28

AUDIO

FOR CD ONLY

Noise Inspection

EKS000XZ

The vehicle itself can be a source of noise if noise prevention parts or electrical equipment is malfunction.
Check if noise is caused and/or changed by engine rotation, ignition switch turned to each position, and oper-
ation 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 

Symptom

Check items

Possible cause

CD cannot be inserted

Make sure a CD is not already inserted.

●

CD auto changer

●

CD auto changer 
power circuit. Refer 
to 

AV-29, "Power 

Supply Circuit 
Inspection"

CD cannot be ejected

-

The CD cannot be played.

●

Make sure the CD is not upside down.

●

Make sure there is no dirt, damage, or water on the disc.

CD auto changer

The sound skips, stops suddenly, 
or is distorted.

●

Make sure there is no dirt, damage, or water on the disc.

●

Make sure the trouble is not due to strong vibration.

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.

●

Malfunction with the ignition condenser.

A whistling noise occurs while the engine speed is 
high. A booming noise occurs while the engine is 
running and the lighting switch is ON.

●

Malfunction with the alternator

The occurrence of the noise is linked with the operation of the fuel pump.

●

Malfunction with the fuel pump condenser

Noise only occurs when various 
electrical components are oper-
ating.

A cracking or snapping sound occurs with the 
operation of various switches.

●

Relay malfunction, radio malfunction

The noise occurs when various motors are operat-
ing.

●

Malfunction with the motor case ground

●

Malfunction with the motor

The noise occurs constantly, not just under certain conditions.

●

Rear window  defogger coil malfunction

●

Open circuit in printed heater

●

Poor ground of antenna amplifier or 
antenna feeder line

●

Mirror type film is attached on the rear win-
dow glass.

●

After-market TV antenna and/or electrical 
accessories such as radio are attached on 
the rear window glass.

A cracking or snapping sound occurs while the vehicle is being driven, especially 
when it is vibrating excessively.

●

Malfunction with the ground wire of body 
parts.

●

Malfunction with ground due to part installa-
tion malfunction.

●

Malfunction with wiring connections or a 
short circuit