Infiniti QX56 (JA60). Manual - part 75

AV-108

< COMPONENT DIAGNOSIS >

[AUDIO SYSTEM]

MICROPHONE SIGNAL CIRCUIT

MICROPHONE SIGNAL CIRCUIT

Description

INFOID:0000000005146343

Voice signals are transmitted from the microphone to the AV control unit using the microphone signal circuits.

Diagnosis Procedure

INFOID:0000000005146344

Regarding Wiring Diagram information, refer to 

AV-116, "Wiring Diagram"

.

1.

CHECK HARNESS BETWEEN AV CONTROL UNIT AND MICROPHONE

1. Turn ignition switch OFF.

2. Disconnect AV control unit connector and microphone connec-

tor.

3. Check continuity between AV control unit harness connector

M45 (A) and microphone harness connector R109 (B).

4. Check continuity between AV control unit harness connector

M45 (A) and ground.

Are the continuity test results as specified?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK MICROPHONE POWER SUPPLY

1. Connect AV control unit connector and microphone connector.

2. Turn ignition switch ON.

3. Check voltage between microphone harness connector R109

terminal 4 and ground.

Is voltage reading approx. 5 volts?

YES

>> GO TO 3.

NO

>> Replace AV control unit. Refer to 

AV-169, "Removal and

Installation"

.

3.

CHECK MICROPHONE SIGNAL

A

B

Continuity

Connector

Terminal

Connector

Terminal

M45

72

R109

1

Yes

71

2

70

4

A

—

Continuity

Connector

Terminal

M45

70

Ground

No

71

72

AWLIA1603ZZ

4 - Ground

: Approx. 5V

WKIA5796E

AV

MICROPHONE SIGNAL CIRCUIT

AV-109

< COMPONENT DIAGNOSIS >

[AUDIO SYSTEM]

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

Check signal between AV control unit harness connector M45 termi-

nals 71 and 72.

Are voltage readings as specified?

YES

>> Replace AV control unit. Refer to 

AV-169, "Removal and Installation"

.

NO

>> Replace microphone. Refer to 

AV-187, "Removal and Installation"

.

Connector

(+)

(-)

Reference signal

Terminal

Terminal

M45

71

72

While speaking into MIC

ALNIA0423GB

PKIB5037J

AV-110

< ECU DIAGNOSIS >

[AUDIO SYSTEM]

AV CONTROL UNIT

ECU DIAGNOSIS

AV CONTROL UNIT

Reference Value

INFOID:0000000005146345

VALUES ON THE DIAGNOSIS TOOL

CONSULT-III data monitor item

TERMINAL LAYOUT

PHYSICAL VALUES

Display Item

Dis-
play

Vehicle status

Remarks

VHCL SPD SIG

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)

PKB SIG

ON

Parking brake is applied.

Changes in indication may be delayed. This is 
normal.

OFF

Parking brake is released.

ILLUM SIG

ON

Block the light beam from the auto 
light optical sensor when the light 
SW is ON.

—

OFF

Expose the auto light optical sensor 
to light when the light SW is OFF or 
ON.

IGN SIG

ON

Ignition switch ON

—

OFF

Ignition switch in ACC position

REV SIG

ON

Selector lever in R position

Changes in indication may be delayed. This is 
normal.

OFF

Selector lever in any position other 
than R

ALNIA0670GB

Terminal

(Wire color)

Description

Condition

Reference value

(Approx.)

+

–

Signal name

Input/

Output

1

(GR/L)

Ground Amp. ON signal

Output

Ignition 

switch 

ON

—

Battery voltage

2

(LG)

3

(V)

Pre-amp. audio signal front 
LH

Output

Ignition 

switch 

ON

Audio output

SKIB3609E

AV

AV CONTROL UNIT

AV-111

< ECU DIAGNOSIS >

[AUDIO SYSTEM]

C

D

E

F

G

H

I

J

K

L

M

B

A

O

P

4

(L)

5

(B/W)

Pre-amp. audio signal rear 
LH

Output

Ignition 

switch 

ON

Audio output

6

(Y)

15

Steering switch signal A

Input

Ignition 

switch 

ON

Pressing  

switch

 0V

Pressing  

switch

0.75

Pressing VOL up switch

2V

Except for above

5V

7

(V)

Ground ACC power supply

Input

Ignition 

switch 

ACC

−

Battery voltage

9

(R/L)

Ground Illumination signal

Input

OFF

Lighting switch is OFF

0V

Lighting switch is ON

Battery voltage

10

—

Shield

—

—

—

—

11

(BR)

12

(B/R)

Pre-amp. audio signal front 
RH

Output

Ignition 

switch 

ON

Audio output

13

(W)

14

(B)

Audio signal rear RH

Output

Ignition 

switch 

ON

Audio output

15

Ground

Steering switch signal 
ground

—

Ignition 

switch 

ON

—

0V

16

(BR)

15

Steering switch signal B

Input

Ignition 

switch 

ON

Pressing  

switch

0V

Pressing  

switch

0.75V

Pressing VOL down switch

2V

Except for above

5V

19

(Y)

Ground Battery power supply

Input

Ignition 

switch 

OFF

—

Battery voltage

20

(B)

Ground Ground

—

Ignition 

switch 

ON

—

0V

Terminal

(Wire color)

Description

Condition

Reference value

(Approx.)

+

–

Signal name

Input/

Output

SKIB3609E

SKIB3609E

SKIB3609E