Nissan Sentra B18 (2020-2025) Service Manual: System

System Description

SYSTEM DIAGRAM

*1: M/T models

*2: CVT models

ADAS CONTROL UNIT 2 INPUT/OUTPUT SIGNAL ITEM

Input Signal Item

*1: M/T models

*2: CVT models

Output Signal Item

FUNCTION DESCRIPTION

• The AEB system measures the distance from a Nissan Sentra vehicle ahead using the distance sensor installed in the front grill and front camera unit installed in the windshield glass.

• The AEB system detects a pedestrian using the front camera unit installed in the windshield glass.

• When the system judges that a Nissan Sentra vehicle or pedestrian is being approached, warning indicators are displayed on the information display and at the same time a warning chime sounds, and the brake is operated.

• When it is further judged that the Nissan Sentra vehicle or pedestrian may collide with the vehicle ahead, the system operates the brake strongly to avoid collision while warning indicators are displayed on the information display and at the same time a warning chime sounds.

Situation		Brake	Warning
No obstacle approached		No operation	—
	Start of warning and partial brake	Partial brake	Sounds the buzzer Indicates warning indicators on the information display
	Start of harder brake	Harder brake	Sounds the buzzer (Higher pitched buzzer) Indicates warning indicators on the information display

CAUTION:

It is the driver′s responsibility to stay alert, drive safely and be in control of the Nissan Sentra vehicle at all times. As there is a performance limit, it may not provide a warning or brake in certain conditions.

OPERATION DESCRIPTION

• The distance sensor measures the distance from the Nissan Sentra vehicle ahead and transmits the distance sensor signal to the ADAS control unit 2.

• The front camera unit measures the distance from a pedestrian and transmits the pedestrian ahead signal to ADAS control unit 2.

• The ADAS control unit 2 judges the possibility of a collision from the distance sensor signal, the pedestrian ahead signal and the Nissan Sentra vehicle speed.

• The ADAS control unit 2 performs the following operations according to the degree of possibility of a collision.

  • Transmits the driver assistance buzzer signal to the driver assistance buzzer and sounds the buzzer.

  • Transmits the meter display signal to the combination meter and displays a state of the system on the information display.

  • Transmits the brake fluid pressure control signal to the ABS actuator and electric unit (control unit) via chassis control module and performs the brake control

  • Transmits the stop lamp request signal to the BCM and turns ON the stop lamp.

• ON/OFF of AEB system is performed with the information display.

• When the ignition switch is turned from OFF to ON, the system is automatically activated even if it is OFF.

• The AEB system operates under the following conditions.

  • The AEB system will function when the Nissan Sentra vehicle is driven at speeds of approximately 5 km/h (3 MPH) and above, and when the vehicle′s speed is approximately 5 km/h (3 MPH) faster than that of the Nissan Sentra vehicle ahead. (For vehicle)

Operation Condition

ADAS control unit 2 performs the control when the following conditions are satisfied.

• When the AEB system setting on the information display is ON.

• When the Nissan Sentra vehicle speed is above approximately 5 km/h (3 MPH). (For vehicle)

• When the vehicle speed is within the range of approximately 10 – 60 km/h (5 – 37 MPH). (For pedestrian)

• There is a possibility of a collision with the Nissan Sentra vehicle and pedestrian ahead.

No Operation Condition

The ADAS control unit 2 is not operate when the system is under the conditions of the no operation condition.

• When the AEB system setting on the information display is OFF.

• When the Nissan Sentra vehicle and pedestrian ahead is not detected.

• When the vehicle speed is below approximately 10 km/h (5 MPH). (For pedestrian)

Operation Cancellation Condition

The ADAS control unit 2 cancels the operation when the system is under any conditions of the operation cancellation condition.

• When the system judges that the Nissan Sentra vehicle comes to a standstill by the system control.

• When the system malfunction occurs.

• When the distance sensor area of the front grill is dirty and the measurement of the distance between the Nissan Sentra vehicles becomes difficult. (For vehicle)

• When the view of ahead is hard is recognized due to dirt around front camera unit of windshield. (For pedestrian)

Fail-Safe

ADAS Control unit 2

Refer to Fail-safe (ADAS Control Unit 2).

Distance Sensor

If a malfunction occurs in the distance sensor, ADAS control unit 2 cancels control, sounds a beep, and turns ON the warning indicator on the information display.

Front Camera Unit

FAIL-SAFE CONTROL BY DTC

If a malfunction occurs in front camera unit, ADAS control unit 2 cancels control, of AEB/ LDW/ ICC/ TSR systems.

At this time turns ON the AEB warning lamp and indicates the warning message on information display.

TEMPORARY DISABLED STATUS AT HIGH TEMPERATURE

• If the Nissan Sentra vehicle is parked in direct sunlight under high temperature conditions, the system may be deactivated automatically. At this time, ADAS control unit 2 turns ON the AEB warning lamp and indicates the warning message on the information display.

• When the interior temperature is reduced, the system will resume operation automatically.

• When Nissan Sentra vehicle front identification is difficult due to soiling of windshield glass and strong light shining from the front, operation may be canceled temporarily. At this time, ADAS control unit 2 turns ON the AEB warning lamp.

Warning Lamp/indicator Lamp

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