Nissan Sentra. Manual - part 239

DLK-72

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

B2621 INSIDE ANTENNA

B2621 INSIDE ANTENNA

DTC Logic

INFOID:0000000009756373

NOTE:

The Signal Tech II Tool (J-50190) can be used to perform the following functions. Refer to the Signal Tech II

User Guide for additional information.

• Check Intelligent Key relative signal strength

• Confirm vehicle Intelligent Key antenna signal strength

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1. Select INTELLIGENT KEY of BCM using CONSULT.

2. Select INSIDE ANT DIAGNOSIS in WORK SUPPORT mode.

3. Perform inside key antenna (INSIDE ANT DIAGNOSIS) on WORK SUPPORT of INTELLIGENT KEY.

4. Check BCM for DTC.
Is inside key antenna DTC detected?

YES

>> Refer to 

DLK-72, "Diagnosis Procedure"

.

NO

>> Inside key antenna (instrument center) is OK.

Diagnosis Procedure

INFOID:0000000009756374

NOTE:

The Signal Tech II Tool (J-50190) can be used to perform the following functions. Refer to the Signal Tech II

User Guide for additional information.

• Check Intelligent Key relative signal strength

• Confirm vehicle Intelligent Key antenna signal strength

Regarding Wiring Diagram information, refer to 

DLK-49, "Wiring Diagram"

.

1.

CHECK INSIDE KEY ANTENNA INPUT SIGNAL 1

1. Turn ignition switch ON.

2. Check signal between BCM harness connector and ground using oscilloscope.

DTC

CONSULT display 

description

DTC detecting condition

Possible cause

B2621

INSIDE ANTENNA 1

An excessive high or low voltage from inside anten-
na (instrument center) is sent to BCM

• Inside key antenna (instrument 

center)

• Harness between BCM and inside 

key antenna (instrument center)

• BCM

B2621 INSIDE ANTENNA

DLK-73

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

DLK

N

O

P

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-73, "Removal and Installation"

.

NO

>> GO TO 2.

2.

CHECK INSIDE KEY ANTENNA CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect BCM connector and inside key antenna (instrument center) connector.

3. Check continuity between BCM harness connector and inside key antenna (instrument center) harness

connector.

4. Check continuity between BCM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness.

3.

CHECK INSIDE KEY ANTENNA INPUT SIGNAL 2

1. Replace inside key antenna (instrument center). (New antenna or other antenna)

2. Connect BCM connector and inside key antenna (instrument center) connector.

3. Turn ignition switch ON.

4. Check signal between BCM harness connector and ground using oscilloscope.

(+)

(–)

Condition

Signal

(Reference value)

BCM

Connector

Terminal

M83

46
47

Ground

When Intelligent Key is in the an-
tenna detection area

When Intelligent Key is not in the 
antenna detection area

JMKIA3839GB

JMKIA5951GB

BCM

Inside key antenna (instrument center)

Continuity 

Connector

Terminal

Connector

Terminal

M83

47

M86

1

Yes

46

2

BCM

Ground

Continuity 

Connector

Terminal

M83

47

No

46

DLK-74

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

B2621 INSIDE ANTENNA

Is the inspection result normal?

YES

>> Replace inside key antenna (instrument center). 

NO

>> Replace BCM. Refer to 

BCS-73, "Removal and Installation"

.

(+)

(–)

Condition

Signal

(Reference value)

BCM

Connector

Terminal

M83

47
46

Ground

When Intelligent Key is in the an-
tenna detection area

When Intelligent Key is not in the 
antenna detection area

JMKIA3839GB

JMKIA5951GB

B2622 INSIDE ANTENNA

DLK-75

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

DLK

N

O

P

B2622 INSIDE ANTENNA

DTC Logic

INFOID:0000000009756375

NOTE:

The Signal Tech II Tool (J-50190) can be used to perform the following functions. Refer to the Signal Tech II

User Guide for additional information.

• Check Intelligent Key relative signal strength

• Confirm vehicle Intelligent Key antenna signal strength

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1. Select INTELLIGENT KEY of BCM using CONSULT.

2. Select INSIDE ANT DIAGNOSIS in WORK SUPPORT mode.

3. Perform inside key antenna (INSIDE ANT DIAGNOSIS) on WORK SUPPORT of INTELLIGENT KEY.

4. Check BCM for DTC.
Is inside key antenna DTC detected?

YES

>> Refer to 

DLK-75, "Diagnosis Procedure"

.

NO

>> Inside key antenna (console) is OK.

Diagnosis Procedure

INFOID:0000000009756376

NOTE:

The Signal Tech II Tool (J-50190) can be used to perform the following functions. Refer to the Signal Tech II

User Guide for additional information.

• Check Intelligent Key relative signal strength

• Confirm vehicle Intelligent Key antenna signal strength

Regarding Wiring Diagram information, refer to 

DLK-49, "Wiring Diagram"

.

1.

CHECK INSIDE KEY ANTENNA INPUT SIGNAL 1

1. Turn ignition switch ON.

2. Check signal between BCM harness connector and ground using oscilloscope.

DTC

CONSULT display 

description

DTC detecting condition

Possible cause

B2622

INSIDE ANTENNA 2

An excessive high or low voltage from inside anten-
na (console) is sent to BCM

• Inside key antenna (console)
• Harness between BCM and inside 

key antenna (console)

• BCM