Infiniti M45 (Y34). Manual - part 172

AUDIO

AV-21

C

D

E

F

G

H

I

J

L

M

A

B

AV

58 (R)

Ground

Communica-
tion signal 
(CHG REQ)

Input

ON

Insert/eject 
magazine.

CD auto changer 
operation is not 
possible.

59 (W)

Ground

Communica-
tion signal 
(CHG-H/U)

Input

ON

Insert/eject 
magazine.

CD auto changer 
operation is not 
possible.

60 (B)

Ground

Communica-
tion signal 
(H/U-CHG)

Output

ON

Press the CD 
switch.

CD auto changer 
operation is not 
possible.

71 (R/L)

Ground

Illumination 
signal

Input

OFF

Lighting switch 
is ON (1st posi-
tion).

Battery voltage

Audio unit illumi-
nation does not 
come on when 
lighting switch is 
ON (1st position).

Turn lighting 
switch OFF.

Approx. 0V 

72 (L/B)

Ground

ACC power

Input

ACC

-

Battery voltage

Audio unit opera-
tion is not possi-
ble.

73 (SB)

Ground

Battery power

Input

OFF

-

Battery voltage

Cassette tape 
player operation is 
not possible.

75 (P/L)

Ground

Radio 
antenna amp. 
ON signal

Output

ON

-

Approx.10V or more

Receiving status 
of radio broadcast 
becomes bad.

76 (SB)

Ground

Illumination 
control signal

Input

ON

Illumination con-
trol switch is 
operated by 
lighting switch in 
1st position.

Changes between approx. 0 and 

approx. 12V.

Audio unit illumi-
nation cannot be 
controlled. 

78

-

Shield
(Audio sound 
signal)

-

-

-

-

-

Terminal No.

Item

Signal 

input/

output

Condition

Voltage

Example of symp-

tom

+

-

Ignition 

switch

Operation

SKIA0196E

SKIA0197E

SKIA0198E

AV-22

AUDIO

Terminals and Reference Value for CD Auto Changer

AKS002NO

80 (BR)

79 (Y)

Audio sound 
signal (LH)

Output

ON

Play cassette 
tape.

Audio sound is not 
heard from 
speaker  LH.

82 (B)

81 (W)

Audio sound 
signal (RH)

Output

ON

Play cassette 
tape.

Audio sound is not 
heard from 
speaker  RH.

Terminal No.

Item

Signal 

input/

output

Condition

Voltage

Example of symp-

tom

+

-

Ignition 

switch

Operation

SKIA0195E

SKIA0195E

Terminal No.

Signal 

name

Signal 

input/

output

Condition

Voltage

Example of symptom

+

-

Ignition 

switch

Operation

2 (L)

1 (P)

CD sound 
signal (LH)

Output

ON

Play CD.

CD sound is not 
heard from  speaker 
LH.

4 (LG)

3 (PU)

CD sound 
signal (RH)

Output

ON

Play CD.

CD sound is not 
heard from  speaker 
RH.

6

-

Shield
(CD sound 
signal)

-

-

-

-

-

8 (R)

Ground

Communi-
cation sig-
nal (REQ)

Output

ON

Insert/eject maga-
zine.

CD auto changer 
operation is not pos-
sible.

9 (W)

Ground

Communi-
cation sig-
nal (TXD)

Output

ON

Insert/eject maga-
zine.

CD auto changer 
operation is not pos-
sible.

SKIA0195E

SKIA0195E

SKIA0196E

SKIA0197E

AUDIO

AV-23

C

D

E

F

G

H

I

J

L

M

A

B

AV

Self-Diagnosis Function

AKS002NQ

DESCRIPTION 

●

Diagnosis function consists of the self-diagnosis mode, and the “CONFIRMATION/ADJUSTMENT” mode.

●

Self-diagnosis mode checks for connection among audio unit, and CD auto changer and analyzes each
unit, then displays the results.

DIAGNOSIS ITEM 

Self-Diagnosis Mode

AKS002NR

OPERATION PROCEDURE 

●

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

AV-69, "Self-Diagnosis Mode"

for models with navigation system, and 

DI-113, "Self-Diagnosis Mode"

  for vehicles without navigation

system.

Trouble Diagnosis

AKS002NT

●

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.

10 (B)

Ground

Communi-
cation sig-
nal (RXD)

Input

ON

Press the CD 
switch.

CD auto changer 
operation is not pos-
sible.

12 (SB)

Ground

Battery 
power

Input

OFF

-

Battery voltage

CD auto changer 
operation is not pos-
sible.

13 (SB)

Ground

Illmination 
signal (-)

Input

OFF

Illmination control 
switch is oper-
ated by lighting 
switch in 1st posi-
tion.

Changes between approx. 0V 
and approx. 12V.

CD auto chager illmi-
nation does not come 
on when lighting 
switch is ON (1st 
position).

14 

(R/L)

Ground

Illmination 
signal (+)

Input 

OFF

Lighting switch  
ON (1st position).

Approx.12V

CD auto changer  illu-
mination cannot be 
controlled. 

Lighting switch 
OFF.

Approx.0V

15 (B)

Ground

Ground

-

ON

-

Approx. 0V

-

16

 (L/OR)

Ground

ACC power

Input

ACC

-

Battery voltage

CD auto changer 
operation is not pos-
sible.

Terminal No.

Signal 

name

Signal 

input/

output

Condition

Voltage

Example of symptom

+

-

Ignition 

switch

Operation

SKIA0198E

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.

AV-24

AUDIO

MALFUNCTION  WITH RADIO, TAPE  AND CD

FOR RADIO ONLY 

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.

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-26, "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-26, "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

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-26, "Power Supply Circuit 

Inspection"