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
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