Nissan Maxima. Manual - part 1053

B2190 NATS ANTENNA AMP.

SEC-37

< DTC/CIRCUIT DIAGNOSIS >

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B2190 NATS ANTENNA AMP.

Description

INFOID:0000000010051933

Performs ID verification through BCM and Intelligent Key when push-button ignition switch is pressed.

Prohibits the start of engine when an unregistered ID of Intelligent Key is used.

DTC Logic

INFOID:0000000010051934

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1. Insert Intelligent Key into the key slot.

2. Check “Self Diagnostic Result” with CONSULT.
Is DTC detected?

YES

>> Refer to 

SEC-37, "Diagnosis Procedure"

.

NO

>> GO TO 2

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Press the push-button ignition switch.

2. Check “Self Diagnostic Result” with CONSULT.
Is DTC detected?

YES

>> Refer to 

SEC-37, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010051935

Regarding Wiring Diagram information, refer to 

SEC-147, "Wiring Diagram"

.

1.

 INSPECTION START

Check the case in which DTC is detected.

• Case1: It is detected when Intelligent Key is inserted into key slot.

• Case2: It is detected after Intelligent Key is inserted into key slot and push-button ignition switch is pressed.
In which case is DTC detected?

Case1. >> GO TO 2

Case2. >> GO TO 4

2.

CHECK KEY SLOT INPUT SIGNAL

1. Turn ignition switch OFF.

2. Disconnect key slot harness connector.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2190

NATS ANTENNA 
AMP

Inactive communication between key slot and 
BCM.

• Harness or connectors

(The key slot circuit is open or 
shorted)

• Key slot 
• BCM

SEC-38

< DTC/CIRCUIT DIAGNOSIS >

B2190 NATS ANTENNA AMP.

3. Check voltage between key slot harness connector M40 termi-

nal 2 and ground.

Is the inspection result normal?

YES

>> Replace key slot. Refer to 

SEC-163, "Removal and

Installation"

.

NO

>> GO TO 3

3.

CHECK KEY SLOT CIRCUIT

1. Disconnect BCM harness connector.

2. Check continuity between key slot harness connector M40 (A)

terminal 2 and BCM harness connector M19 (B) terminal 68.

3. Check continuity between key slot harness connector M40 (A)

terminal 2 and ground.

Is the inspection result normal?

YES

>> GO TO 8

NO

>> Repair harness or connector.

4.

CHECK PUSH-IGNITION SWITCH OPERATION

Press push-button ignition switch and check if it turns ON.
Does ignition switch turn to ON?

YES

>> GO TO 5

NO

>> GO TO 7

5.

CHECK KEY SLOT COMMUNICATION SIGNAL

1. Turn ignition switch OFF.

2. Disconnect key slot harness connector.

3. Check voltage between key slot harness connector M40 termi-

nal 3 and ground.

Is the inspection result normal?

YES

>> Replace key slot. Refer to 

SEC-163, "Removal and

Installation"

.

NO

>> GO TO 6

6.

CHECK KEY SLOT COMMUNICATION SIGNAL CIRCUIT

1. Disconnect BCM harness connector.

Key slot

Ground

Voltage [V]

(approx.)

Connector

Terminal

M40

2

Ground

Battery voltage

ALKIA0428ZZ

Key slot

BCM

Continuity

Connector

Terminal

Connector

Terminal

A:  M40

2

B:  M19

68

Yes

Key slot

Ground

Continuity

Connector

Terminal

A: M40

2

Ground

No

ALKIA0429ZZ

Key slot

Ground

Voltage [V]

(approx.)

Connector

Terminal

M40

3

Ground

Battery voltage

ALKIA0430ZZ

B2190 NATS ANTENNA AMP.

SEC-39

< DTC/CIRCUIT DIAGNOSIS >

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2. Check continuity between key slot harness connector M40 (A)

terminal 3 and BCM harness connector M19 (B) terminal 69.

3. Check continuity between key slot harness connector M40 (A)

terminal 3 and ground.

Is the inspection result normal?

YES

>> GO TO 8

NO

>> Repair harness or connector.

7.

CHECK KEY SLOT GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect key slot harness connector.

3. Check continuity between key slot harness connector M40 ter-

minal 7 and ground.

Is the inspection result normal?

YES

>> GO TO 8

NO

>> Repair harness or connector.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-41, "Intermittent Incident"

.

>> Inspection End.

Key slot

BCM

Continuity

Connector

Terminal

Connector

Terminal

A: M40

3

B: M19

69

Yes

Key slot

Ground

Continuity

Connector

Terminal

A: M40

3

Ground

No

ALKIA0431ZZ

Key slot

Ground

Continuity

Connector

Terminal

M40

7

Ground

Yes

ALKIA0344ZZ

SEC-40

< DTC/CIRCUIT DIAGNOSIS >

B2191 DIFFERENCE OF KEY

B2191 DIFFERENCE OF KEY

Description

INFOID:0000000010051936

Performs ID verification through BCM and Intelligent Key when push-button ignition switch is pressed.

Prohibits the start of engine when an unregistered ID of Intelligent Key is used.

DTC Logic

INFOID:0000000010051937

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1. Insert the Intelligent Key in the key slot.  Press the push-button ignition switch.

2. Check “Self Diagnostic Result” with CONSULT.
Is DTC detected?

YES

>> Refer to 

SEC-40, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010051938

1.

PERFORM INITIALIZATION

Perform initialization with CONSULT. Re-register all Intelligent Keys.

For initialization and registration of Intelligent Key, refer to CONSULT Immobilizer mode and follow the on-

screen instructions.
Can the system be initialized and can the engine be started with re-registered Intelligent Key?

YES

>> Intelligent Key was unregistered.

NO

>> BCM is malfunctioning.

• Replace BCM. Refer to 

BCS-79, "Removal and Installation"

.

• Perform initialization again.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2191

DIFFERENCE OF 
KEY

The ID verification results between BCM and Intel-
ligent Key are NG. The registration is necessary.

• Intelligent Key