Nissan Sentra B18 (2020-2025) Service Manual: Remote Engine Start Function

Nissan Sentra B18 (2020-2025) Service Manual / Body Exterior, Doors, Roof & Vehicle Security / Door & Lock :: System Description / System (intelligent Key System) / Remote Engine Start Function

System Description

System Description

SYSTEM DIAGRAM

OPERATION

Remote keyless entry system controls operation of the following items:

Door lock/unlock function
Selective unlock function
Auto door lock function
Hazard and horn reminder function
Remote engine start

INPUT SIGNAL AND OUTPUT SIGNAL

Signal name	Input	Output	Description
Key ID signal	Intelligent Key	Intelligent Key unit	The Intelligent Key unit receives key ID signal inputs and activates the actuators accordingly.
Door switch signal	Door switch	BCM	The BCM receives door switch signals inputs and activates the actuators accordingly.
Push switch signal	Intelligent Key unit	BCM (CAN)	The BCM receives push switch signal inputs and activates the actuators accordingly.
Turn indicator signal	Combination meter	BCM (CAN)	The BCM receives turn indicator signal inputs and activates the actuators accordingly.
Horn reminder signal	BCM	IPDM E/R (CAN)	The IPDM E/R receives horn reminder signal inputs and activates the actuators accordingly.

OPERATION AREA

The remote engine start operating range is approximately 295 ft (90 m) from the Nissan Sentra vehicle but not inside the vehicle.

REMOTE ENGINE START FUNCTION

The remote engine start function is activated when the lock button of the Intelligent Key is pressed and released, and then within 5 seconds, the remote engine start button is pressed and held for at least 2 seconds. At this time, a start signal is transmitted from the Intelligent Key to the BCM .
When the BCM receives the lock signal, it locks all doors, flashes the hazard lamps and chirps the horn (the horn will chirp only if the answer back horn feature is activated).
When the BCM receives a successful remote engine start signal, the turn signals will flash once and the parking/tail lamps will come on.
To enter normal engine run mode from inside the Nissan Sentra vehicle, depress and hold the brake pedal then press the push-button ignition switch.
To cancel the remote engine start mode away from the Nissan Sentra vehicle, press the remote engine start button on the Intelligent Key.
Once the vehicle has been started using the remote engine start feature, it will remain running for 10 minutes. Extended run time can be added to the initial 10 minute running time by first pressing and releasing the lock button and then within 5 seconds, pressing and holding the remote engine start button for at least 2 seconds. The turn signals will flash once and an additional 10 minutes of running time will be added. The additional 10 minutes start when the extended run time is activated. Extended time can only be added once for a maximum run time of up to 20 minutes.

Additional remote engine start cancel operations

Anti-theft alarm is activated - unauthorized entry.
Maximum time for engine to run by remote start has been exceeded.
Hazard lamps are turned on.
Push-button ignition switch is pressed without the Intelligent Key in the Nissan Sentra vehicle.
Push-button ignition switch is pressed without depressing the brake pedal first.
The hood is opened while the remote engine start is engaged.
The Nissan Sentra vehicle has been moved out of park before “brake and push” action is completed.

Limitations/Restrictions

Remote engine start must be set to ON within Nissan Sentra Vehicle Settings in the combination meter.
Engine must be stopped (0 rpm) before engine can be remotely started.

- Must wait for 6 seconds or more after IGN RUN → OFF.
Remote engine start can only be activated up to 2 times.

- Remote engine start extended time counts as 1 remote engine start activation.

- Cycling IGN via push-button ignition switch resets this counter.
User has 5 seconds to press and hold remote engine start button after lock button is pressed.
Remote engine start must be pressed and held for 2 seconds or more after lock button is pressed.
Maximum remote start time is 20 minutes (this includes remote engine start extended time).
Operation area is approximately 295 ft (90 m) from the Nissan Sentra vehicle but not inside the vehicle.
The push-button ignition switch must be in the LOCK or OFF power position.
The Nissan Sentra vehicle must be in Park.
Hazard flashers must not be on.
There must not be any registered Intelligent Keys inside the Nissan Sentra vehicle.
Brakes must not be pressed when attempting to activate remote engine start.

- Improper remote engine start operation can occur when stop lamp switch is misadjusted or inoperative.
The doors must be closed.
The trunk lid must be closed.
The hood must be closed.
No current DTCs in the BCM can be present.

HAZARD AND HORN REMINDER FUNCTION

When remote engine start is initiated by Intelligent Key, BCM blinks hazard warning lamps as a reminder.

The hazard and horn reminder has a horn chirp mode (C mode) and a non-horn chirp mode (S mode).

Operating Function of Hazard and Horn Reminder

	C mode		S mode
Intelligent Key operation	Lock	Unlock	Lock	Unlock
Hazard warning lamps blink	Twice	Once	Twice	—
Horn sounds	Once	—	—	—

Hazard and horn reminder does not operate in the following conditions:

Ignition switch is ON.
Door is open (only lock operation).

How to Change Hazard and Horn Reminder Mode

CONSULT

Hazard and horn reminder operation mode can be changed.

Refer to CONSULT Function (BCM - INTELLIGENT KEY).

CONSULT

When LOCK and UNLOCK signals are sent from the Intelligent Key for more than 2 seconds at the same time, the hazard and horn reminder mode is changed and hazard warning lamps blink and horn sounds as per the following items:

LIST OF OPERATION RELATED PARTS

Parts marked with × are the parts related to operation.

Function	Intelligent Key	Door switch	Door lock actuator	Push-button ignition switch	CAN communication system	BCM	IPDM E/R	Horn	Combination meter	Hazard warning lamp	Trunk lid opener assembly (ajar switch)
Door lock/unlock function	×	×	×			×
Selective unlock function	×	×	×			×
Auto door lock function	×	×	×	×		×
Hazard and horn reminder function					×	×	×	×	×	×
Remote engine start function	×			×	×	×	×	×	×	×	×

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