Nissan Frontier. Manual - part 1127

DIAGNOSIS AND REPAIR WORKFLOW

SEC-5

< BASIC INSPECTION >

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9.

REPAIR OR REPLACE THE MALFUNCTIONING PART

1. Repair or replace the malfunctioning part.

2. Reconnect parts or connectors disconnected during Diagnostic Procedure again after repair and replace-

ment.

3. Check DTC. If DTC is displayed, erase it.

>> GO TO 10

10.

FINAL CHECK

When DTC was detected in step 9, perform DTC Confirmation Procedure or Component Function Check

again, and then check that the malfunctions have been fully repaired.

When symptom was described by the customer, refer to the confirmed symptom in step 3 or 4, and check that

the symptom is not detected.
Does the symptom reappear?

YES (DTC is detected)>>GO TO 8

YES (Symptom remains)>>GO TO 6

NO

>> Inspection End.

SEC-6

< BASIC INSPECTION >

PRE-INSPECTION FOR DIAGNOSTIC

PRE-INSPECTION FOR DIAGNOSTIC

Basic Inspection

INFOID:0000000009479015

1.

INSPECTION START

Turn ignition switch OFF.

NOTE:

Before starting operation check, open front windows.

>> GO TO 2

2.

CHECK SECURITY INDICATOR LAMP

1. Lock doors using keyfob or mechanical key.

2. Check that security indicator lamp illuminates for 30 seconds.
Does the security indicator lamp illuminate?

YES

>> GO TO 3

NO

>> Perform diagnosis and repair. Refer to 

SEC-11, "System Description"

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3.

CHECK ALARM FUNCTION

1. After 30 seconds, security indicator lamp will start to blink.

2. Open any door before unlocking with keyfob or mechanical key.
Does the alarm function properly?

YES

>> GO TO 4

NO

>> Check the following.

• The vehicle security system does not phase in alarm mode. Refer to 

SEC-76, "Symptom Table"

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• Alarm (horn and headlamps) does not operate. Refer to 

SEC-76, "Symptom Table"

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4.

CHECK ALARM CANCEL OPERATION

Unlock any door using keyfob or mechanical key.
Does the alarm (horn and headlamps) stop?

YES

>> Inspection End.

NO

>> Check door lock function. Refer to 

DLK-12, "DOOR LOCK AND UNLOCK SWITCH : System

Description"

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INSPECTION AND ADJUSTMENT

SEC-7

< BASIC INSPECTION >

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INSPECTION AND ADJUSTMENT

ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT
ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Re-
quirement

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Refer to the CONSULT Immobilizer mode and follow the on-screen instructions.

ECM RE-COMMUNICATING FUNCTION
ECM RE-COMMUNICATING FUNCTION : Description

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Performing following procedure can automatically perform re-communication of ECM and BCM, but only when

the ECM has been replaced with a new one (*1).

*1: New one means an ECM which has never been energized on-board.

(In this step, initialization procedure by CONSULT is not necessary)

NOTE:

• When registering new Key IDs or replacing the ECM that is not brand new, refer to CONSULT Immo-

bilizer mode and follow the on-screen instructions.

• If multiple keys are attached to the key holder, separate them before work.

• Distinguish keys with unregistered key ID from those with registered ID.

ECM RE-COMMUNICATING FUNCTION : Special Repair Requirement

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1.

PERFORM ECM RE-COMMUNICATING FUNCTION

1. Install ECM.

2. Using a registered key (*2), turn ignition switch to “ON”.

*2: To perform this step, use the key that has been used before performing ECM replacement.

3. Maintain ignition switch in “ON” position for at least 5 seconds.

4. Turn ignition switch to “OFF”.

5. Start engine.
Can engine be started?

YES

>> Procedure is completed.

NO

>> Initialize control unit. Refer to CONSULT Immobilizer mode and follow the on-screen instructions.

SEC-8

< SYSTEM DESCRIPTION >

NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS)

SYSTEM DESCRIPTION

NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS)

System Diagram

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System Description

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INPUT/OUTPUT SIGNAL CHART

BCM

SYSTEM DESCRIPTION

NATS (Nissan Anti-Theft System) has the following immobilizer functions:

• Engine immobilizer shows high anti-theft performance to prevent engine from starting by other than the

owner.

• Only a key with key ID registered in BCM and ECM can start engine, and shows high anti-theft performance

to prevent key from being copied or stolen.

• Therefore, NATS warns outsiders that the vehicle is equipped with the anti-theft system. Refer to 

SEC-11,

"System Description"

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• If system detects malfunction, security indicator illuminates when ignition switch is turned to ON position.

• If the owner requires, ignition key ID or mechanical key ID can be registered for up to 5 keys.

• During trouble diagnosis or when the following parts have been replaced, and if ignition key is added, regis-

tration

*1

 is required. 

*1

: All keys kept by the owner of the vehicle should be registered with mechanical key.

- ECM

- BCM

- Ignition key

- Remote keyless entry receiver

• NATS trouble diagnosis, system initialization and additional registration of other mechanical key IDs must be

carried out using CONSULT.

When NATS initialization has been completed, the ID of the inserted mechanical key or mechanical key IDs

can be carried out.

• Possible symptom of NATS malfunction is “Engine cannot start”. Identify the possible causes according to

“Work Flow”, Refer to 

SEC-3, "Work Flow"

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PIIA1121E

Switch/Input signal

Input signal to BCM

BCM function

Actuator/Output signal

NATS antenna amp.

Key ID

NATS

• Security indicator lamp
• Starter request

ECM

Engine status signal