Infiniti M45 (Y34). Manual — part 173

AUDIO

AV-25

C

D

E

F

G

H

I

J

L

M

A

B

AV

FOR CASSETTE PLAYER ONLY

FOR CD ONLY

Noise Inspection

AKS002NU

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

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 sup-
ply circuit.Refer to

AV-

26, "Power Supply Cir-
cuit Inspection"

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 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.

Symptom

Check items

Possible cause

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

AV-26

AUDIO

Power Supply Circuit Inspection

AKS002NV

1.

CHECK FUSE

●

Make sure the following fuses of the BOSE speaker amplifier, audio unit and CD auto changer are not
blown. Refer to

PG-62, "FUSE BLOCK - JUNCTION BOX (J/B) NO.1"

.

PG-64, "FUSE, FUSIBLE LINK

AND RELAY BLOCK (J/B)"

.

PG-65, "FUSE, FUSIBLE LINK AND RELAY BOX"

.

OK or NG

OK

>> GO TO 2.

NG

>> If fuse is blown be sure to eliminate cause of malfunction before installing new fuse. Refer to

PG-

2, "POWER SUPPLY ROUTING"

.

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.

Occurrence condition

Possible cause

Unit

Terminals

Signal name

Fuse No.

(+)

(-)

Connector

Terminal (wire color)

BOSE speaker amplifier

B233

11(L)

Ground

Battery power

75

B234

34(L/B)

Ground

ACC power

21

Audio unit

M86

73(SB)

Ground

Battery power

52

M86

72(L/B)

Ground

ACC power

21

CD auto changer

M109

12(SB)

Ground

Battery power

52

M109

16(L/OR)

Ground

ACC power

21

AUDIO

AV-27

C

D

E

F

G

H

I

J

L

M

A

B

AV

2.

POWER SUPPLY CIRCUIT CHECK

Disconnect the each unit connector. Check voltage between the fol-
lowing harness connector terminal (+) and body ground (-).

OK or NG

OK

>> Inspection end.

NG

>> Repair or replace harness between each unit and fuse

or fusible link.

Audio System Does Not Turn On

AKS002NW

1.

SELF-DIAGNOSIS

1.

Perform self-diagnosis. Refer to

AV-69, "Self-Diagnosis Mode"

for models with navigation system and

DI-

113, "Self-Diagnosis Mode"

for models without navigation system.

OK or NG

OK

>> Replace Audio unit.

NG

>> Check the malfunctioned area according to the self-diagnosis result.

Steering Switch Does Not Operate

AKS002NX

1.

SELF-DIAGNOSIS MODE OF MULTIFUNCTION SWITCH

1.

Carry out the self-diagnosis mode in the self-diagnosis function.

2.

Push steering switch.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 3.

Unit

Terminal No.

Power

Source

Ignition

switch

Reference

voltage (V)

(+)

(-)

Connector

Terminal

(wire color)

BOSE
speaker
amplifier

B233

11 (L)

Ground

Battery

power

OFF

Battery
voltage

B234

34 (L/B)

Ground

ACC

power

ACC

Battery
voltage

Audio unit

M86

73 (SB)

Ground

Battery

power

OFF

Battery
voltage

M86

72 (L/B)

Ground

ACC

power

ACC

Battery
voltage

CD Auto
changer

M109

12 (SB)

Ground

Battery

power

OFF

Battery
voltage

M109

16 (L/OR)

Ground

ACC

power

ACC

Battery
voltage

SKIA4202E

Beep sound should operate.

AV-28

AUDIO

2.

SELF-DIAGNOSIS MODE OF AV COMMUNICATION LINE

1.

Carry out the self-diagnosis mode in the self-diagnosis function.Refer to

AV-69, "Self-Diagnosis Mode"

(with navigation system) or refer to

DI-113, "Self-Diagnosis Mode"

.

Dose self–diagnosis start?

YES

>> With self-diagnosis results, check the malfunction part.

NO

>>

●

Check multifunction switch of power supply and ground circuit check.Refer to

DI-83, "Power

Supply and Ground Circuit Inspection for Multifunction Switch"

.

DI-122, "Inspection of Multi-

function Switch for Power Supply and Ground Circuit"

.

●

Check harness between multifunction switch and AV and NAVI control unit or AV control unit.

3.

CHECK STEERING SWITCH CIRCUIT

1.

Turn the ignition switch OFF.

2.

Disconnect steering switch connector and multifunction switch connector.

3.

Check the following.

–

Continuity between steering switch harness connector M444 terminal 2 (G) and multifunction switch har-
ness connector M83 terminal 7 (GY/L).

–

Continuity between steering switch harness connector M444 terminal 2 (G) and ground.

OK or NG

OK

>> GO TO 4.

NG

>> Check the following.

●

Harness between for open or short steering switch and spiral cable.

●

Connector housing terminal for disconnection and looseness.

4.

CHECK HORN OPERATION

1.

Check horn operation.

OK or NG

OK

>> GO TO 5.

NG

>> Check horn system.

5.

POWER SUPPLY CIRCUIT CHECK

1.

Connect steering switch connector.

2.

Turn the ignition switch ON.

3.

Check harness between steering switch harness connector
M444 terminal 1(R) and ground.

OK or NG

OK

>> GO TO 6

NG

>> Check harness for open or short between steering

switch and horn relay [located in fuse, fusible link and
relay block (J/B)]

Terminals

Continuity

(+)

(–)

Connector

Terminal

(Wire color)

Connector

Terminal

(Wire color)

M444

2 (G)

M83

7(GY/L)

Yes

M444

2 (G)

Ground

No

SKIA3757E

Horn should operate.

1 (R) - Ground

: Battery voltage should exist.

SKIA3758E