Infiniti QX56 (Z62). Manual - part 412

DLK-114

< DTC/CIRCUIT DIAGNOSIS >

B2628 OUTSIDE ANTENNA

B2628 OUTSIDE ANTENNA

DTC Logic

INFOID:0000000006225918

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON.

2.

Check “Self Diagnostic Result” mode of “BCM” using CONSULT-III.

Is DTC detected?

YES

>> Refer to 

DLK-108, "Diagnosis Procedure"

.

NO

>> Outside key antenna (back door) is OK.

Diagnosis Procedure

INFOID:0000000006225919

1.

CHECK OUTSIDE KEY ANTENNA INPUT SIGNAL 1

1.

Turn ignition switch OFF.

2.

Check signal between BCM harness connector and ground using oscilloscope.

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-81, "Removal and Installation"

.

NO

>> GO TO 2.

2.

CHECK OUTSIDE KEY ANTENNA CIRCUIT

1.

Disconnect BCM connector and outside key antenna (back door) connector.

2.

Check continuity between BCM harness connector and outside key antenna (back door) harness connec-
tor.

DTC

CONSULT-III display 

description

DTC detecting condition

Possible cause

B2628

OUTSIDE ANTENNA

An excessive high or low voltage from outside key 
antenna (back door) is sent to BCM

• Outside key antenna (back door)
• Between BCM – Outside key an-

tenna (back door)

(+)

(–)

Condition

Signal

(Reference value)

BCM

Connector

Terminal

Back door

M71

82, 83

Ground

When Intelligent Key is in the 
antenna detection area

When Intelligent Key is not in 
the antenna detection area

JMKIA3839GB

JMKIA3838GB

B2628 OUTSIDE ANTENNA

DLK-115

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

L

M

A

B

DLK

N

O

P

3.

Check continuity between BCM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness.

3.

CHECK OUTSIDE KEY ANTENNA INPUT SIGNAL 2

1.

Replace outside key antenna (back door). (New antenna or other antenna)

2.

Connect BCM and outside key antenna (back door) connector.

3.

Check signal between BCM harness connector and ground using oscilloscope.

Is the inspection result normal?

YES

>> Replace outside key antenna (back door).

NO

>> Replace BCM. Refer to 

BCS-81, "Removal and Installation"

.

BCM

Outside key antenna (back door)

Continuity 

Connector

Terminal

Connector

Terminal

M71

82

D153

1

Existed

83

2

BCM

Ground

Continuity 

Connector

Terminal

M71

82

Not existed

83

(+)

(–)

Condition

Signal

(Reference value)

BCM

Connector

Terminal

Back door

M71

82, 83

Ground

When Intelligent Key is in the 
antenna detection area

When Intelligent Key is not in 
the antenna detection area

JMKIA3839GB

JMKIA3838GB

DLK-116

< DTC/CIRCUIT DIAGNOSIS >

POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

AUTOMATIC BACK DOOR CONTROL UNIT

AUTOMATIC BACK DOOR CONTROL UNIT : Diagnosis Procedure

INFOID:0000000006225920

1.

CHECK FUSE, FUSIBLE LINK AND CIRCUIT BREAKER

Check that the following fuse, fusible link and circuit breaker are not fusing.

Is the fuse fusing?

YES

>> Replace the blown fuse or fusible link after repairing the affected circuit if a fuse or fusible link is

blown.

NO

>> GO TO 2.

2.

CHECK POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect automatic back door control module connector.

3.

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

Is the measurement value normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness.

3.

CHECK GROUND CIRCUIT

Check continuity between automatic back door control module harness connector and ground.

Does continuity exist?

YES

>> INSPECTION END

NO

>> Repair or replace harness.

Fuse and fusible link No.

Signal name

T (30A)

Battery power supply

9 (10A)

4 (10A)

Ignition power supply

(+)

(

−

)

Condition

Voltage

(Approx.)

Automatic back door control module

Connector

Terminal

B26

9

Ground

Ignition switch

ON

Battery voltage

10

—

28

Automatic back door control module

Ground

Continuity

Connector

Terminal

B26

34

Existed

DOOR SWITCH

DLK-117

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

L

M

A

B

DLK

N

O

P

DOOR SWITCH

Component Function Check

INFOID:0000000006225921

1.

CHECK FUNCTION

1.

Select “DOOR LOCK” of “BCM” using CONSULT-III.

2.

Select “DOOR SW-DR”, “DOOR SW-AS”, “DOOR SW-RL”, “DOOR SW-RR”, in “DATA MONITOR” mode.

3.

Check that the function operates normally according to the following conditions.

Is the inspection result normal?

YES

>> Door switch is OK.

NO

>> Refer to 

DLK-117, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006225922

1.

CHECK DOOR SWITCH INPUT SIGNAL

1.

Turn ignition switch OFF.

2.

Disconnect malfunctioning door switch connector.

3.

Check signal between malfunctioning door switch harness connector and ground using oscilloscope.

Monitor item

Condition

Status

DOOR SW-DR

Driver side door

Open

On

Closed

Off

DOOR SW-AS

Passenger side door

Open

On

Closed

Off

DOOR SW-RL

Rear door LH

Open

On

Closed

Off

DOOR SW-RR

Rear door RH

Open

On

Closed

Off