Infiniti QX56 (JA60). Manual - part 58

AV-40

< FUNCTION DIAGNOSIS >

[AUDIO SYSTEM]

DIAGNOSIS SYSTEM (AV CONTROL UNIT)

DATA MONITOR

Display Item List

A/C AND AV SWITCH ASSEMBLY
A/C AND AV SWITCH ASSEMBLY : Component Function Check

INFOID:0000000005146244

A/C and AV switch assembly self-diagnosis function

Description

The ON/OFF operation (continuity) of each switch in the A/C and AV switch assembly can be checked.

Self-diagnosis mode

• Press the “BACK” button and the “UP” button within 10 seconds

after turning the ignition switch from OFF to ACC and hold them for

3 seconds or more. When the self-diagnosis mode starts, a beep

will sound and all LED indicators of the switch will illuminate.

• The continuity of each switch and control dial of the A/C and AV

switch assembly can be checked. If the switch is operating nor-

mally, the system will beep and the LED’s will illuminate when each

switch is operated.

Finishing self-diagnosis mode

Self-diagnosis mode is canceled when the ignition switch is turned OFF.

• AV COMM CIRCUIT [U1300]
• REAR CAMERA LAN CONN [U1252]

• A malfunction is detected in camera con-

trol unit power supply and ground cir-
cuits.

• Malfunction is detected on AV communi-

cation signal between Camera control 
unit and AV control unit.

Camera control unit power supply and 
ground circuits. Refer to 

AV-72, "REAR 

VIEW CAMERA CONTROL UNIT : Diagno-
sis Procedure"

.

• AV COMM CIRCUIT [U1300]
• CAMERA CONT. CONN [U1250]
• REAR CAMERA LAN CONN [U1252]

• Malfunction is detected on AV communi-

cation circuit between camera control 
unit and AV control unit.

• Malfunction is detected on AV communi-

cation signal between camera control 
unit and AV control unit.

AV communication circuit between camera 
control unit and AV control unit. Refer to 

AV-

110, "Reference Value"

.

Error item

Description

Possible malfunction factor/Action to take

Display item [unit]

ALL

SIGNALS

SELECTION 

FROM MENU

Description

VHCL SPD SIG [ON/OFF]

X

X

Displays “ON” when vehicle speed > 0 km/h. Displays “OFF” when ve-
hicle speed = 0 km/h.

PKB SIG [ON/OFF]

X

X

Displays [ON/OFF] condition of parking brake switch.

ILLUM SIG [ON/OFF]

X

X

Displays [ON/OFF] condition of lighting switch.

IGN SIG [ON/OFF]

X

X

Displays [ON/OFF] condition of ignition switch.

REV SIG [ON/OFF]

X

X

Displays [ON/OFF] condition of back-up lamp switch.

AWIIA0171GB

AV

U1000 CAN COMM CIRCUIT

AV-41

< COMPONENT DIAGNOSIS >

[AUDIO SYSTEM]

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COMPONENT DIAGNOSIS

U1000 CAN COMM CIRCUIT

Description

INFOID:0000000005146245

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic control units are equipped onto a vehicle and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN-H, CAN-L) allowing a high rate of information transmission with less wiring. Each

control unit transmits/receives data but selectively reads required data only.

CAN Communication Signal Chart. Refer to 

LAN-44, "CAN Communication Signal Chart"

.

DTC Logic

INFOID:0000000005146246

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000005146247

1.

PERFORM SELF DIAGNOSTIC

1. Turn ignition switch ON and wait for 2 seconds or more.

2. Check “Self Diagnostic Result” of “AV Control Unit”. 
Is “CAN COMM CIRCUIT” displayed?

YES

>> Refer to “LAN system”. Refer to 

LAN-14, "Trouble Diagnosis Flow Chart"

.

NO

>> Refer to GI section. Refer to 

GI-38, "Intermittent Incident"

.

DTC

Display contents of CON-

SULT-III

Diagnostic item is detected when ...

Probable malfunction location

U1000

CAN COMM CIRCUIT

When AV control unit is not transmitting or re-
ceiving CAN communication signal for 2 sec-
onds or more.

CAN communication system.

AV-42

< COMPONENT DIAGNOSIS >

[AUDIO SYSTEM]

U1010 CONTROL UNIT (CAN)

U1010 CONTROL UNIT (CAN)

Description

INFOID:0000000005146248

Initial diagnosis of AV control unit.

DTC Logic

INFOID:0000000005146249

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000005146250

1.

REPLACE AV CONTROL UNIT

When DTC U1010 is detected, replace AV control unit. Refer to 

AV-169, "Removal and Installation"

.

>> Inspection end. 

DTC

Display contents of CON-

SULT-III

Diagnostic item is detected when ...

Probable malfunction location

U1010

CONTROL UNIT (CAN)

CAN initial diagnosis malfunction is detected.

AV control unit.

AV

U1200 AV CONTROL UNIT

AV-43

< COMPONENT DIAGNOSIS >

[AUDIO SYSTEM]

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U1200 AV CONTROL UNIT

Description

INFOID:0000000005146251

Replace the AV control unit if this DTC is displayed. Refer to 

AV-169, "Removal and Installation"

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DTC Logic

INFOID:0000000005146252

Part name

Description

AV CONTROL UNIT

• It is the master unit of the MULTI AV system  and it is connected to each control 

unit by means of communication. It operates each system according to com-
munication signals from the AV control unit.

• AV control unit includes audio function and vehicle information function.
• It is connected to ECM and combination meter via CAN communication to ob-

tain necessary information for the vehicle information function.

• It inputs the automatic brightness ON/OFF signals that are required for the dis-

play dimming control.

• It inputs the signals for driving status recognition (vehicle speed, reverse and 

parking brake). 

DTC

Display contents of CONSULT-III

DTC Detection Condition

Action to take

U1200

Control Unit
FLASH- ROM
[U1200]

An internal malfunction is detected in AV control unit 
(FLASH-ROM).

Replace AV control unit. Re-
fer to 

AV-169, "Removal and 

Installation"

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