Infiniti QX56 (Z62). Manual - part 404

 

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Infiniti QX56 (Z62). Manual - part 404

 

 

DLK-82

< DTC/CIRCUIT DIAGNOSIS >

U1000 CAN COMM CIRCUIT

DTC/CIRCUIT DIAGNOSIS

U1000 CAN COMM CIRCUIT

Description

INFOID:0000000006225873

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Modern
vehicle is equipped with many electronic control unit, 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-line, CAN L-line) 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-28, "CAN COMMUNICATION SYSTEM : CAN Communica-

tion Signal Chart"

.

DTC Logic

INFOID:0000000006225874

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000006225875

1.

PERFORM SELF DIAGNOSTIC

1.

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

2.

Check “Self Diagnostic Result”.

Is “CAN COMM CIRCUIT” displayed?

YES

>> Refer to 

LAN-18, "Trouble Diagnosis Flow Chart"

.

NO

>> Refer to 

GI-40, "Intermittent Incident"

.

DTC

CONSULT-III display 

description

DTC detecting condition

Possible cause

U1000

CAN COMM

When automatic back door control unit cannot 
communicate CAN communication signal con-
tinuously for 2 seconds or more.

CAN communication system

U1010 CONTROL UNIT (CAN)

DLK-83

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

L

M

A

B

DLK

N

O

P

U1010 CONTROL UNIT (CAN)

DTC Logic

INFOID:0000000006225876

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000006225877

1.

REPLACE AUTOMATIC BACK DOOR CONTROL MODULE

When DTC [U1010] is detected, replace automatic back door control module.

>> Replace automatic back door control module. Refer to 

DLK-262, "Removal and Installation"

.

DTC

CONSULT-III dis-

play description

DTC detecting condition

Possible cause

U1010

CONTROL UNIT 
(CAN)

Automatic back door control unit detected inter-
nal CAN communication circuit malfunction

Automatic back door control mod-
ule

DLK-84

< DTC/CIRCUIT DIAGNOSIS >

B2401 IGNITION POWER SUPPLY CIRCUIT

B2401 IGNITION POWER SUPPLY CIRCUIT

DTC Logic

INFOID:0000000006225878

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait for at least 1 second.

2.

Check “Self Diagnostic Result” mode of “AUTOMATIC BACK DOOR CONTROL UNIT” using CONSULT-
III.

Is DTC detected?

YES

>> Refer to 

DLK-84, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006225879

1.

CHECK FUSE

1.

Turn ignition switch OFF.

2.

Check 10A fuse, [No. 4, located in fuse block (J/B)].

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace the blown fuse after repairing the affected circuit if a fuse is blown.

2.

CHECK POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect automatic back door control unit connector.

3.

Check voltage between automatic back door control unit harness connector and ground.

Is the measurement value normal?

YES

>> Check intermittent incident. Refer to 

GI-40, "Intermittent Incident"

.

NO

>> Repair or replace harness.

DTC

CONSULT-III display 

description

DTC detecting condition

Possible cause

B2401

IGN OPEN

When the automatic back door control unit detects 
the following condition for 0.3 second or more
• Power supply condition (OFF) of automatic back 

door control unit and Ignition position signal (ON) 
from BCM via CAN

• Fuse
• Harness or connectors

(Ignition power supply condition 
circuit is open or shorted)

(+)

(

)

Condition

Voltage

(Approx.)

Automatic back door control unit

Connector

Terminal

B26

9

Ground

Ignition switch

ON

Battery voltage

OFF

0 V

B2403 ENCODER

DLK-85

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

L

M

A

B

DLK

N

O

P

B2403 ENCODER

DTC Logic

INFOID:0000000006225880

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON. 

2.

Check “Self Diagnostic Result” mode of “AUTOMATIC BACK DOOR CONTROL UNIT” using CONSULT-
III.

Is DTC detected?

YES

>> Refer to 

DLK-85, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006225881

1.

CHECK AUTOMATIC BACK DOOR CONTROL MODULE POWER SUPPLY AND GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check automatic back door control module power supply and ground circuit.
Refer to 

DLK-116, "AUTOMATIC BACK DOOR CONTROL UNIT : Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Replace automatic back door control module. Refer to 

DLK-262, "Removal and Installation"

.

NO

>> Repair or replace the malfunctioning parts.

DTC

CONSULT-III dis-

play description

DTC detecting condition

Possible cause

B2403

PULSE ENCODER

When the automatic back door control unit can not re-
ceive the signal from the encoder just after starting the 
open/close operation

• Battery voltage (low battery)
• Automatic back door control mod-

ule

 

 

 

 

 

 

 

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