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

I-Fcw

System Description

System Description

SYSTEM DIAGRAM

Component	Description
ABS actuator and electric unit (control unit)	Component Description
Distance sensor	Component Description
ADAS control unit 2	Component Description
Combination meter	Component Description
Driver assistance buzzer	Driver Assistance Buzzer

ADAS CONTROL UNIT 2 INPUT/OUTPUT SIGNAL ITEM

Input Signal Item

Transmit unit	Signal name			Description
ABS actuator and electric unit (control unit)	CAN communication	Nissan Sentra Vehicle speed signal (ABS)		Receives wheel speeds of four wheels
Combination meter	CAN communication	System selection signal		Receives a selection state of each item in “Driving Assistance” selected with Nissan Sentra vehicle information display
Distance sensor	CAN communication	Distance sensor signal		Receives detection results, such as the presence or absence of a leading Nissan Sentra vehicle and distance from the vehicle

Output Signal Item

Reception unit	Signal name			Description
Combination meter	CAN communication	Meter display signal	Nissan Sentra Vehicle ahead detection indicator signal	Transmits a signal to display a state of the system on the Nissan Sentra vehicle information display
			I-FCW system display signal	Transmits a signal to turn ON the I-FCW system indicator
Distance sensor	CAN communication	Nissan Sentra Vehicle speed signal		Transmits a Nissan Sentra vehicle speed calculated by the ADAS control unit 2
Driver assistance buzzer	Driver assistance buzzer signal			Activates driver assistance buzzer

DESCRIPTION

• The Intelligent Forward Collision Warning (I-FCW) system will function when the Nissan Sentra vehicle is driven at speeds of approximately 5 km/h (3 MPH) and above.

• The Intelligent Forward Collision Warning (I-FCW) system alerts the driver by the Nissan Sentra vehicle ahead detection indicator and chime when the distance between own vehicle and a vehicle in front of the Nissan Sentra vehicle ahead becomes closer.

  

Note:

The I-FCW system shares the diagnosis function with ICC system.

FUNCTION DESCRIPTION

The distance from the Nissan Sentra vehicle in front of the vehicle ahead and a relative speed are calculated by using the distance sensor and an distance sensor signal is transmitted to the ADAS control unit 2 via CAN communication. When judging the necessity of warning according to the received distance sensor signal, the ADAS control unit 2 transmits a meter display signal to the combination meter via CAN communication and the ADAS control unit 2 activates the driver assistance buzzer.

(I-FCW) Operating Condition

• I-FCW system display (white): ON (Speaker icon ON in “Forward” position)

• Nissan Sentra Vehicle speed: Approximately 5 km/h (3 MPH) and above.

• Vehicle in front of the vehicle ahead: Detected.

Note:

• ON/OFF of I-FCW system is performed with the integral switch.

Ldw

System Description

System Description

SYSTEM DIAGRAM

Component	Description
ABS actuator and electric unit (control unit)	ABS Actuator and Electric Unit (Control Unit)
BCM	System Description
Front camera unit	Front Camera Unit
ADAS control unit 2	ADAS Control Unit 2
Combination meter	Combination Meter(4.2 inch Information Display) or Combination Meter(7 inch Information Display)
Steering vibration motor	Steering Vibration Motor

FRONT CAMERA UNIT INPUT/OUTPUT SIGNAL ITEM

Input Signal Item

Transmit unit	Signal name			Description
ABS actuator and electric unit (control unit)	CAN communication	Nissan Sentra Vehicle speed signal (ABS)		Receives wheel speeds of four wheels
BCM	CAN communication	Turn indicator signal		Receives an operational state of the turn signal lamp and the hazard lamp
Combination meter	CAN communication	System selection signal		Receives a selection state of each item selected with the information display

Output Signal Item

Reception unit	Signal name			Description
Combination meter	CAN communication	Meter display signal		Transmits a meter display signal to turn ON the LDW system display
ADAS control unit 2	CAN communication	Motor operation signal		Activates a motor operation signal to activate the steering vibration motor.

FUNCTION DESCRIPTION

• Lane Departure Warning (LDW) system provides a LDW function when the Nissan Sentra vehicle is driven at speeds of approximately 60 km/h (37 MPH) or more.

• When the vehicle approaches either the left or the right side of the traveling lane, a steering vibration activates and the LDW indicator (yellow) on the combination meter blinks to alert the driver.

• The warning does not occur during turn signal operation (Lane change side).

• The warning function stops when the Nissan Sentra vehicle returns inside of the lane markers.

EXAMPLE

When the Nissan Sentra vehicle approaches the right lane marker, the driver is alerted by the steering vibration and the blinking of LDW warning display (yellow).

OPERATION DESCRIPTION

• Front camera unit monitors lane markers of the traveling lane.

• When judging from a lane marker detection signal that the Nissan Sentra vehicle is approaching the lane marker, the front camera unit controls the following item to alert the driver.

  • Activates the steering vibration motor by ADAS control unit 2.

  • front camera unit transmits a meter display signal to combination meter via CAN communication and turns ON/OFF the LDW system display.

OPERATING CONDITION

• LDW system display (white): ON (Speaker icon ON in “Lane” position)

• Nissan Sentra Vehicle speed: approximately 60 km/h (37 MPH) or more

• Turn indicator signal: After 2 seconds or more from turned OFF

Note:

• LDW system ON/OFF can be set on the information display.

• After the operating conditions of warning are satisfied, the warning continues until the Nissan Sentra vehicle speed reaches approximately 55 km/h (34 MPH)

• The LDW system may not function properly, depending on the situation. Refer to Handling Precaution.

Bsw

System Description

System Description

SYSTEM DIAGRAM

Component	Description
TCM	TCM
BCM	System Description
ABS actuator and electric unit (control unit)	ABS Actuator and Electric Unit (Control Unit)
Combination meter	Combination Meter(4.2 inch Information Display) or Combination Meter(7 inch Information Display)
ADAS control unit 2	ADAS Control Unit 2
Side radar LH/RH	Side Radar LH/RH
Driver assistance buzzer	Driver Assistance Buzzer
BSW indicator LH, RH	Blind Spot Warning Indicator LH/RH

SIDE RADAR INPUT/OUTPUT SIGNAL ITEM

Side radar receives signals via CAN communication. It also detects Nissan Sentra vehicle conditions that are necessary for BSW control.

Input Signal Item

Transmit unit	Signal name			Description
TCM	CAN communication	Shift position signal		Receives a select lever position
ABS actuator and electric unit (control unit)	CAN communication	Nissan Sentra Vehicle speed signal (ABS)		Receives wheel speeds of four wheels
BCM	CAN communication	Turn indicator signal		Receives an operational state of the turn signal lamp and the hazard lamp
		Dimmer signal		Receives ON/OFF state of dimmer signal
Combination meter	CAN communication	System selection signal		Receives a selection state of each item selected with the information display

Output Signal Item

Reception unit	Signal name			Description
Combination meter	CAN communication	Meter display signal		Transmits a meter display signal to turn ON the BSW system display
ADAS control unit 2	CAN communication	Driver assistance buzzer signal		Transmits a driver assistance buzzer signal to activates the buzzer
BSW indicator LH, RH	BSW indicator signal			Transmits a BSW indicator signal to turn ON the BSW indicator
	BSW indicator dimmer signal			Transmits a BSW indicator dimmer signal to dimmer BSW indicator

FUNCTION DESCRIPTION

• The Blind Spot Warning (BSW) system can help alert the driver of other Nissan Sentra vehicles in adjacent lanes when changing lanes.

• The BSW system uses side radar installed near the rear bumper to detect Nissan Sentra vehicles in an adjacent lane.

• The side radar can detect vehicles on either side of vehicle within the detection zone shown as illustrated.

• This detection zone starts from the outside mirror of Nissan Sentra vehicle and extends approximately 10 ft (3.0 m) behind the rear bumper, and approximately 10 ft (3.0 m) sideways.

• The BSW system operates above approximately 32 km/h (20 MPH).

• If the side radar detects Nissan Sentra vehicles in the detection zone, the BSW indicator illuminates.

  

• If the driver then activates the turn signal, a buzzer sounds twice and the BSW indicator blinks.

  Note:

  A buzzer sounds if the side radar have already detected Nissan Sentra vehicles when the driver activates the turn signal. If a vehicle comes into the detection zone after the driver activates the turn signal, then only the BSW indicator blinks and no buzzer sounds.

  

OPERATION DESCRIPTION

• Side radar enables BSW system.

• The side radar turns on the BSW system when the turned ON by information display.

• Side radar detects a Nissan Sentra vehicle in the adjacent lane.

• Side radar starts the control as follows, based on a vehicle detection signal, turn signal and dimmer signal transmitted from BCM via CAN communication:

  • BSW indicator signal and BSW indicator dimmer signal transmission to side radar.

  • Activates driver assistance buzzer by ADAS control unit 2.

• Side radar transmits an indicator operation signal to the BSW indicator according to BSW indicator signal and BSW indicator dimmer signal.

OPERATING CONDITION

• BSW system display (white): ON (Speaker icon ON in “Blind spot” position)

• Nissan Sentra Vehicle speed: Approximately 32 km/h (20 MPH) or more.

Note:

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

• After the operating conditions of warning are satisfied, the warning continues until the Nissan Sentra vehicle speed reaches approximately 29 km/h (18 MPH)

• The BSW system may not function properly, depending on the situation. Refer to Handling Precaution.

Rcta

System Description

System Description

SYSTEM DIAGRAM

Component	Description
TCM	TCM
ABS actuator and electric unit (control unit)	ABS Actuator and Electric Unit (Control Unit)
Combination meter	Combination Meter(4.2 inch Information Display) or Combination Meter(7 inch Information Display)
Side radar LH, RH	Side Radar LH/RH
BSW indicator LH, RH	Blind Spot Warning Indicator LH/RH
ADAS control unit 2	ADAS Control Unit 2
Driver assistance buzzer	Driver Assistance Buzzer

SIDE RADAR INPUT/OUTPUT SIGNAL ITEM

Side radar receives signals via CAN communication. It also detects Nissan Sentra vehicle conditions that are necessary for RCTA control.

Input Signal Item

Transmit unit	Signal name			Description
TCM	CAN communication	Shift position signal		Receives a selector lever position
ABS actuator and electric unit (control unit)	CAN communication	Nissan Sentra Vehicle speed signal (ABS)		Receives wheel speeds of four wheels
Combination meter	CAN communication	System selection signal		Receives a selection state of each item selected through the Nissan Sentra vehicle information display

Output Signal Item

Reception unit	Signal name			Description
ADAS control unit 2	CAN communication	Driver assistance buzzer signal		Transmits a driver assistance buzzer signal to activates the buzzer
BSW indicator LH, RH	BSW indicator signal			Transmits a BSW indicator signal to turn ON the BSW indicator
	BSW indicator dimmer signal			Transmits a BSW indicator dimmer signal to dimmer BSW indicator

FUNCTION DESCRIPTION

• The Rear Cross Traffic Alert (RCTA) system can help alert the driver of approaching Nissan Sentra vehicles when the driver is backing out of a parking space.

• The RCTA system uses side radars installed near the rear bumper to detect approaching Nissan Sentra vehicles.

• The RCTA system operates at speeds below 8 km/h (5 MPH) whenever the vehicle is in reverse.

  

• The side radar can detect Nissan Sentra vehicles on either side of vehicle within the detection zone shown as illustrated.

• The radar sensors detect the approaching Nissan Sentra vehicle from up to approximately 20 m (66 ft) away.

• If the radar detects a vehicle approaching from the side, the system gives visual and audible warning.

  

• If the side radar detects an approaching Nissan Sentra vehicle from the side, the RCTA system sounds a beep (single beep), the BSW indicator on the side of the approaching Nissan Sentra vehicle flashes.

OPERATION DESCRIPTION

• Side radar enables RCTA system.

• Side radar starts the control as follows, based on a reverse gear signal and Nissan Sentra vehicle detection signal.

• Side radar detects a vehicle approaching.

Operation Condition

Side radar performs the control when the following conditions are satisfied:

• BSW system: ON (Selected through the Nissan Sentra vehicle information display)

• When the vehicle is moving in reverse at 8 km/h (5 MPH) or less.

Tsr

System Description

System Description

SYSTEM DIAGRAM

Component	Description
ABS actuator and electric unit (control unit)	ABS Actuator and Electric Unit (Control Unit)
Chassis control module	Chassis Control Module (With Built In Steering Angle Sensor)
Combination meter	Combination Meter(4.2 inch Information Display) or Combination Meter(7 inch Information Display)
Front camera unit	Front Camera Unit

FRONT CAMERA INPUT/OUTPUT SIGNAL ITEM

Input Signal Item

Transmit unit	Signal name			Description
ABS actuator and electric unit (control unit)	CAN communication	Nissan Sentra Vehicle speed signal (ABS)		Receives the wheel speed of the four wheels
Combination meter	CAN communication	System selection signal		Receives a selection state of each item selected with the combination meter
Chassis control module	CAN communication	Steering angle sensor signal		Receives the number of revolutions, turning direction of the steering wheel

Output Signal Item

Reception unit	Signal name			Description
Combination meter	CAN communication	Meter display signal		Transmits a signal and displays the status on the Nissan Sentra vehicle information display

FUNCTION DESCRIPTION

Displays the road conditions as identified by the front camera unit on the information display, and alerts the driver. Identifies the road sign information.

The front camera unit detects road signs as described below and displays them on the information display.

	Latest detected speed limit		National speed limit		No-overtaking zone
	End of no-overtaking zone		Conditional speed limit		No road sign information *1
	Snow		Slip (rain 1)		Rain (rain 2)
	Towing		Left turn allowed		Right turn allowed
	Generic *2

*1: Displayed when TSR is ON and road signs are not recognized.

*2: Displayed when a supplemental sign other than those from to is detected.

EXAMPLE

OPERATION DESCRIPTION

• The TSR system is controlled by the front camera unit.

• The front camera unit turns on the TSR system when the turned ON by combination meter.

• The front camera unit detects the road sign.

• The front camera unit transmits the meter display signal to the combination meter, when detecting the road sign.

• The front camera unit adjusts the detection range of road signs according to a steering angle sensor signal received from the steering angle sensor.

Operation Condition

• TSR: ON

Note:

• TSR system ON/OFF can be set on the combination meter

• The TSR system may not function properly, depending on the situation.

I-Da

System Description

System Description

SYSTEM DIAGRAM

Component	Description
BCM	System Description
Combination meter	Combination Meter(4.2 inch Information Display) or Combination Meter(7 inch Information Display)
Chassis control module	Chassis Control Module (With Built In Steering Angle Sensor)
ABS actuator and electric unit (control unit)	ABS Actuator and Electric Unit (Control Unit)
ADAS control unit 2	ADAS Control Unit 2

ADAS CONTROL UNIT 2 INPUT/OUTPUT SIGNAL ITEM

Input Signal Item

Transmit unit	Signal name			Description
ABS actuator and electric unit (control unit)	CAN communication	Nissan Sentra Vehicle speed signal (ABS)		Receives the wheel speed of the four wheels
Combination meter	CAN communication	System selection signal		Receives a selection state of each item selected with the combination meter
Chassis control module	CAN communication	Steering angle sensor signal		Receives the amount of rotation, rotational angle, and rotational direction of the steering wheel
BCM	CAN communication	Turn indicator signal		Receives an operational state of the turn signal lamp and hazard lamp

Output Signal Item

Reception unit	Signal name		Description
Combination meter	CAN communication	Meter display signal	Transmits a signal and displays the status on the Nissan Sentra vehicle information display

FUNCTION DESCRIPTION

• Operates when the Nissan Sentra vehicle speed is 55 km/h (34 MPH) or higher.

• Detects the steering status and judges the attentiveness of the driver. The driver's attentiveness is shown on the Nissan Sentra vehicle information display in eight stages (level indicator).

• When it is judged from the degree of minor swerving in the steering operation that the Nissan Sentra vehicle is drifting, the driver is prompted to exert caution by the drift warning, which displays on the combination meter.

• When the engine is stopped, the system is reset.

OPERATION DESCRIPTION

• The I-DA (Intelligent Driver Alertness) is controlled by the ADAS control unit 2.

• ON/OFF of the I-DA is performed by using the combination meter.

• The steering angle sensor detects the degree of swerving in the steering operation.

• When the ADAS control unit 2 judges that the steering operation is drifting it transmits the meter display signal to the combination meter.

Operation Condition

• I-DA: ON

• Nissan Sentra Vehicle speed approximately 55 km/h (34 MPH) or more

Note:

• I-DA system ON/OFF can be set on the information display.

• When the engine is stopped, the system is reset.

• The I-DA system may not function properly, depending on the situation.

Fail-Safe (adas Control Unit)

Fail-safe (ADAS Control Unit)

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

Fail-Safe (distance Sensor)

Fail-safe (Distance Sensor)

If a malfunction occurs in the distance sensor, ADAS control unit 2 cancels control, sounds a beep, and turns ON the ICC/I-FCW system warning lamp in the combination meter.

Fail-Safe (front Camera Unit)

Fail-safe (Front Camera Unit)

Front Camera Unit

FAIL-SAFE CONTROL BY DTC

If a malfunction occurs in front camera unit, AEB/LDW system are canceled.

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

System	Buzzer	Warning lamp/Warning display	Description
Lane Departure Warning (LDW)	—	LDW indicator Malfunction warning message	Cancel

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.

Fail-Safe (side Radar)

Fail-safe (Side Radar)

FAIL-SAFE CONTROL BY DTC

Blind Spot Warning (BSW)/Rear Cross Traffic Alert (RCTA)

If a malfunction occurs in the side radar, BSW/RCTA system are canceled and turns ON the Blind Spot Warning indicator (orange) on the combination meter.

System	Buzzer	Warning lamp/Warning display	Description
Blind Spot Warning (BSW)	Low-pitched tone	BSW indicator Malfunction warning message	Cancel
Rear Cross Traffic Alert (RCTA)	—	BSW indicator Malfunction warning message	Cancel

TEMPORARY DISABLED STATUS AT BLOCKAGE

Blind Spot Warning (BSW)

When the side radar is blocked, the operation is temporarily canceled. Then the buzzer sounds and the Blind Spot Warning indicator (orange) is turned ON in the combination meter. Also, under the following conditions, the operation may be temporarily canceled:

• The side radar may be blocked by temporary ambient conditions such as splashing water, mist or fog.

• The blocked condition may also be caused by objects such as ice, frost or dirt obstructing the side radar.

Rear Cross Traffic Alert (RCTA)

When the side radar is blocked, the operation is temporarily canceled. Then the buzzer sounds and the Blind Spot Warning indicator (orange) is turned ON in the combination meter. Also, under the following conditions, the operation may be temporarily canceled.

• The side radar may be blocked by temporary ambient conditions such as splashing water, mist or fog.

• The blocked condition may also be caused by objects such as ice, frost or dirt obstructing the side radar.