Nissan Maxima. Manual - part 1046

INSPECTION AND ADJUSTMENT

SEC-9

< BASIC INSPECTION >

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INSPECTION AND ADJUSTMENT

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

INFOID:0000000010051898

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

INFOID:0000000010051899

1.

PERFORM ECM RE-COMMUNICATING FUNCTION

1. Install ECM.

2. Insert the registered Intelligent 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-10

< SYSTEM DESCRIPTION >

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION

SYSTEM DESCRIPTION

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION

System Diagram

INFOID:0000000010051900

System Description

INFOID:0000000010051901

INPUT/OUTPUT SIGNAL CHART

SYSTEM DESCRIPTION 

• The engine start function of Intelligent Key system is a system that makes it possible to start and stop the

engine without removing the key. It verifies the electronic ID using two-way communications when pressing

the push-button ignition switch while carrying the Intelligent Key, which operates based on the results of

electronic ID verification for Intelligent Key using two-way communications between the Intelligent Key and

the vehicle.

NOTE:

The driver should carry the Intelligent Key at all times.

• Intelligent Key has 2 IDs [for Intelligent Key and for NVIS (NATS)]. It can perform the door lock/unlock oper-

ation and the push-button ignition switch operation when the registered Intelligent Key is carried.

• When the Intelligent Key battery is discharged, it can be used as emergency back-up by inserting the Intelli-

gent Key to the key slot. At that time, perform the NVIS (NATS) ID verification. If it is used when the Intelli-

gent Key is carried, perform the Intelligent Key ID verification.

• When the push-button ignition switch is pressed the ID will be verified. If the ID is successfully verified, start-

ing the engine will be possible.

• If the door lock/unlock operation is performed when the Intelligent Key battery is discharged, all doors lock/

unlock can be performed by operating the driver door key cylinder using the mechanical key set in the Intel-

ligent Key. 

• Intelligent Key system can register up to 4 keys (Including the standard Intelligent Key) on request from the

owner.

NOTE:

AWKIA1698GB

Switch

Input signal to BCM

BCM function

Actuator

Push-button ignition switch

Push switch

Engine start function

• Starter relay (IPDM E/R)
• Starter control relay (IPDM E/

R)

• Starter  motor
• KEY warning lamp

CVT shift selector

P range

TCM

N, P range

Stop lamp switch

Brake ON/OFF

Each inside key antenna

Request signal

Remote keyless entry receiver

Key ID

Each door switch

Door open/close

ECM

Engine status signal

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION

SEC-11

< SYSTEM DESCRIPTION >

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• Refer to 

DLK-24, "INTELLIGENT KEY : System Description"

 for any functions other than engine start func-

tion of Intelligent Key system.

PRECAUTIONS FOR INTELLIGENT KEY SYSTEM

• In the Intelligent Key system of model A35, the transponder [the chip for NVIS (NATS) ID verification]

is integrated into the Intelligent Key. (For the conventional models, it is integrated into the mechani-

cal key.) Therefore, the mechanical key cannot perform the ID verification, and thus it cannot start

the engine. Instead, the NVIS (NATS) ID verification can be performed by inserting the Intelligent Key

into the key slot, and then it can start the engine.

OPERATION WHEN INTELLIGENT KEY IS CARRIED

1. When the push-button ignition switch is pressed and brake pedal is depressed, the BCM signals the

inside key antenna and transmits the request signal to the Intelligent Key.

2. The Intelligent Key sends the request signal and transmits the Intelligent Key ID signal to the BCM via the

remote keyless entry receiver.

3. The BCM receives the Intelligent Key ID signal and verifies it with the registered ID.
4. BCM turns ACC relay ON and transmits the ignition power supply ON signal to IPDM E/R.
5. IPDM E/R turns the ignition relay ON and starts the ignition power supply.
6. BCM confirms that the shift position is P or N.
7. BCM transmits the starter request signal via CAN communication to IPDM E/R and turns the starter relay

in IPDM E/R ON if BCM judges that the engine start condition is satisfied.

8. IPDM E/R turns the starter control relay ON when receiving the starter request signal.
9. Battery power is supplied through the starter relay and the starter control relay to operate the starter motor

and to start the cranking.

CAUTION:

If a malfunction is detected in the Intelligent Key system, the “KEY” warning lamp in the combina-

tion meter illuminates. At that time, the engine cannot be started.

10. When BCM received feedback signal from ECM acknowledging the engine has been initiated, the BCM

transmits a stop signal to IPDM E/R and stops the cranking by turning OFF the starter motor relay. (If the

engine initiating has failed, the cranking will stop automatically within 5 seconds.)

CAUTION:

When the Intelligent Key is carried outside of the vehicle (inside key antenna detection area) with

the power supply in ACC or ON position, even if the engine start condition* is satisfied, the engine

cannot be started.

*: For the engine start condition, refer to “PUSH-BUTTON IGNITION SWITCH OPERATION PROCEDURE”.

OPERATION RANGE

Engine can be started when Intelligent Key is inside the vehicle. However, sometimes engine might not start

when Intelligent Key is on instrument panel or in glove box.

OPERATION WHEN KEY SLOT IS USED

When the Intelligent Key battery is discharged, it performs the NVIS (NATS) ID verification between the inte-

grated transponder and BCM by inserting the Intelligent Key into the key slot, and then the engine can be

started.

For details relating to starting the engine using key slot, refer to 

SEC-10, "System Description"

.

BATTERY SAVER SYSTEM

When all the following conditions are met for 60 minutes, the battery saver system will cut off the power supply

to prevent battery discharge.

• The ignition switch is in the ACC position

• All doors are closed

• CVT selector lever is in the P position

• No Intelligent Key failures (Intelligent Key warning indicator is not ON)

Reset Condition of Battery Saver System

In order to prevent the battery from discharging, the battery saver system will cut off the power supply when all

doors are closed, the selector lever is in P position and the ignition switch is left in ACC position for 1 hour. If

any of the following conditions are met, the battery saver system is released:

• Opening any door

• Operating with request switch on door lock

SEC-12

< SYSTEM DESCRIPTION >

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION

• Operating with Intelligent Key on door lock

Press push-button ignition switch and ignition switch will change to ACC position from OFF position.

PUSH-BUTTON IGNITION SWITCH OPERATION PROCEDURE

The power supply position changing operation can be performed with the following operations:

NOTE:

• When an Intelligent Key is within the detection area of inside key antenna or when it is inserted to the key

slot, it is equivalent to the operations below.

• When starting the engine, the BCM monitors under the engine start conditions.

- Brake pedal operating condition

- CVT selector lever position

- Vehicle speed

- Engine status

• Unless each start condition is fulfilled, the engine will not respond regardless of how many times the engine

switch is pressed. At that time, illumination repeats the position in the order of LOCK

→ACC→ON→OFF.

*1: When the CVT selector lever position is N position, the engine start condition is different according to the vehicle speed.
• At vehicle speed of 4 km/h (2 MPH) or less, the engine can start only when the brake pedal is depressed.
• At vehicle speed of 4 km/h (2 MPH) or more, the engine can start even if the brake pedal is not depressed. (It is the same as “Engine

stall return operation while driving”.)

*2: When the CVT selector lever position is in any position other than P position and when the vehicle speed is 5 km/h (3 MPH) or more,
the engine stop condition is different.
• Press and hold the push-button ignition switch for 2 seconds or more. (When the push-button ignition switch is pressed for too short a

time, the operation may be invalid, so properly press and hold to prevent an incorrect operation.)

• Press the push-button ignition switch 3 times or more within 1.5 seconds. (Emergency stop operation)

Power supply position

Engine start/stop condition

Push-button ignition switch op-

eration frequency

Brake pedal

CVT selector lever position

LOCK 

→ ACC

Not depressed

Any position

1

LOCK 

→ ACC → ON

Not depressed

Any position

2

LOCK 

→ ACC → ON → 

OFF

Not depressed

Any position

3

LOCK 

→ START

ACC 

→ START

ON 

→ START

(Engine start)

Depressed

P or N position (*1)

1

[If the switch is pressed once, 

the engine starts from any pow-
er supply position (LOCK, ACC, 

and ON)]

Engine is running 

→ 

OFF
(Engine stop)

—

Any position

Vehicle speed < 4 km/h (2 MPH)

1

Engine is running 

→ 

ACC
(Engine stop)

—

Any position other than P (*2)

1

Engine stall return oper-
ation while driving

—

P position

1