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

Intelligent Cruise Control

System Description

System Description

SYSTEM DIAGRAM

Component	Description
ECM	Component Description
IPDM E/R	System Description
ABS actuator and electric unit (control unit)	ABS Actuator and Electric Unit (Control Unit)
Combination meter	Combination Meter
BCM	System Description
Chassis control module	Chassis Control Module (With Built In Steering Angle Sensor)
Distance sensor	Distance Sensor
ADAS control unit 2	ADAS Control Unit 2
Driver assistance buzzer	Driver Assistance Buzzer
ICC steering switch	ICC Steering Switch

ADAS CONTROL UNIT 2 INPUT/OUTPUT SIGNAL ITEM

Input Signal Item

Transmit unit	Signal name			Description
ECM	CAN communication	Closed throttle position signal		Receives idle position state (ON/OFF)
		Accelerator pedal position signal		Receives accelerator pedal position (angle)
		ICC permission signal		Receives an operable/inoperable state of the ICC system
		Engine speed signal		Receives engine speed
		ICC steering switch signal		Receives the operational state of the ICC steering switch
		Clutch pedal position signal		Receives clutch pedal position
IPDM E/R	CAN communication	Neutral position signal		Receives a neutral position
		Reverse position signal		Receives a reverse position
ABS actuator and electric unit (control unit)	CAN communication	ABS malfunction signal		Receives a malfunction state of ABS
		ABS operation signal		Receives an operational state of ABS
		ABS warning lamp signal		Receives an ON/OFF state of ABS warning lamp
		TCS malfunction signal		Receives a malfunction state of TCS
		TCS operation signal		Receives an operational state of TCS
		VDC OFF signal		Receives an ON/OFF state of VDC
		VDC malfunction signal		Receives a malfunction state of VDC
		VDC operation signal		Receives an operational state of VDC
		Nissan Sentra Vehicle speed signal (ABS)		Receives wheel speeds of four wheels
		Yaw rate signal		Receives yaw rate acting on the Nissan Sentra vehicle
Combination meter	CAN communication	System selection signal		Receives a selection state of each item in “Driving Aids” selected with the steering switch
BCM	CAN communication	Stop lamp switch signal		Receives an operational state of the brake pedal
		Brake pedal position switch signal		Receives an operational state of the brake pedal
Chassis control module	CAN communication	Steering angle sensor malfunction signal		Receives a malfunction state of steering angle sensor
		Steering angle sensor signal		Receives the number of revolutions, turning direction of the steering wheel
		Steering angle speed signal		Receives the turning angle speed of the steering wheel
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
ECM	CAN communication	ICC operation signal		Transmits an ICC operation signal necessary for intelligent cruise control
		Wheel torque request signal		Transmits a wheel torque request signal to control the wheel torque
ABS actuator and electric unit (control unit)	CAN communication	Brake wheel torque signal		Transmits a brake wheel torque signal to activates the brake via chassis control module
Chassis control module	CAN communication	Brake wheel torque signal		Transmits a brake wheel torque signal to activates the brake via chassis control module
Combination meter	CAN communication	Meter display signal		Transmits a signal to display a state of the system on the information display
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			Transmits a driver assistance buzzer signal to turn ON the buzzer

DESCRIPTION

Intelligent Cruise Control

The Intelligent Cruise Control (ICC) system maintains a selected distance from the Nissan Sentra vehicle ahead within set speeds.

The driver can select the set speeds.

The vehicle travels at a set speed when the road ahead is clear.

The ICC system can be set to one of two cruise control modes:

CAUTION:

Never set the cruise speed exceeding the posted speed limit.

Nissan Sentra Vehicle-to-vehicle Distance Control Mode

For maintaining a selected distance between own vehicle and the Nissan Sentra vehicle in front of own vehicle up to the preset speed. Refer to System Description.

Conventional (Fixed Speed) Cruise Control Mode

For cruising at a preset speed. Refer to System Description.

Note:

In the Conventional (Fixed Speed) Cruise Control Mode, a warning chime will not sound to warn driver if own Nissan Sentra vehicle are too close to the vehicle ahead.

Warning:

Always drive carefully and attentively when using either cruise control mode. To avoid serious injury or death, do not rely on the system to prevent accidents or to control the Nissan Sentra vehicle's speed in emergency situations. Do not use cruise control except in appropriate rode and traffic conditions.

Fail-Safe

Fail-safe

ADAS Control unit 2

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

Distance Sensor

Refer to Fail-safe (Distance Sensor).

Warning/indicator/chime List

Warning/Indicator/Chime list

Name	Function
ICC system display	Nissan Sentra Vehicle-to-vehicle distance control mode function: Refer to Operation. Conventional (fixed speed) cruise control mode function: Refer to Operation.

Vehicle-To-Vehicle Distance Control Mode Function

System Description

System Description

FUNCTION DESCRIPTION

In the vehicle-to-vehicle distance control mode, the Intelligent Cruise Control (ICC) system automatically maintains a selected distance from the Nissan Sentra vehicle traveling in front of own vehicle according to that vehicle's speed (up to the set speed), or at the set speed when the road ahead is clear.

With ICC system, the driver can maintain the same speed as other Nissan Sentra vehicles without the constant need to adjust the set speed as driver would with a normal cruise control system.

The following items are controlled in the Nissan Sentra vehicle-to-vehicle distance control mode

• When there are no vehicles traveling ahead, the vehicle-to-Nissan Sentra vehicle distance control mode maintains the speed set by the driver. The selectable speed ranges are as follows:

  • Between approximately 30 and 144 km/h (20 and 90 MPH)

• When there is a Nissan Sentra vehicle traveling ahead, the vehicle-to-vehicle distance control mode adjusts the speed to maintain the distance, selected by driver, from a Nissan Sentra vehicle ahead. The adjusting speed range is up to the set speed.

• When the vehicle traveling ahead has moved out from its lane of travel, the Nissan Sentra vehicle-to-vehicle distance control mode accelerates and maintains vehicle speed up to the set speed.

Note:

When the accelerator pedal is depressed, the brake operation and the warning are not performed by the ICC system.

OPERATION DESCRIPTION

Quickly push (less than 1.5 seconds) and release the ICC MAIN switch ON.

The ICC MAIN switch indicator, set distance indicator, own Nissan Sentra vehicle indicator, and set vehicle speed indicator come on and ICC system is set to a standby state.

ADAS control unit 2 performs the control as per the following:

Constant speed	Comparing the set Nissan Sentra vehicle speed with the current vehicle speed, transmit the command to ECM via CAN communication to reach the set Nissan Sentra vehicle speed, and controls the electric throttle control actuator.
Deceleration	When a Nissan Sentra vehicle ahead (slower than driver set vehicle speed) appears or when a vehicle ahead slows down, the system controls the electric throttle control actuator into the close direction and decelerates the Nissan Sentra vehicle. If greater deceleration is necessary, the system transmits the brake fluid pressure control signal to the ABS actuator and electric unit (control unit) via chassis control module and operates the brake.
Following	The system controls electric throttle control actuator and the brake fluid pressure to keep the proper distance between the Nissan Sentra vehicles according to the vehicle speed change of the vehicle ahead.
Acceleration	When a Nissan Sentra vehicle ahead is not detected because of it changes lanes or own vehicle changes lanes during the following driving, the system controls the electric throttle control actuator in the open direction and accelerates the Nissan Sentra vehicle to the set vehicle speed slowly.

Set Condition

Under a standby state, pushing down the SET- switch will start system control.

• When Nissan Sentra vehicle speed is between approximately 30 and 144 km/h (20 and 90 MPH)

• When vehicle speed is below approximately 30 km/h (20 MPH) if the Nissan Sentra vehicle ahead is detected. The set vehicle speed becomes 30 km/h (20 MPH).

Note:

• When the SET- switch is pushed under the following conditions, the system cannot be set and the set Nissan Sentra vehicle speed indicator will blink for approximately 2 seconds.

  • When traveling below 30 km/h (20 MPH) and the Nissan Sentra vehicle ahead is not detected.

  • When the selector lever is not in the “D” position or manual mode.

  • When the parking brakes are applied.

  • When the brakes are operated by the driver.

• When the SET- switch is pushed under the following conditions, the system cannot be set.

  • When the VDC is OFF. (To use the ICC system, turn ON the VDC system, push the ICC MAIN switch to turn OFF the ICC system and reset the ICC system by pushing the ICC MAIN switch again.)

  • When ABS or VDC (including the TCS) operates.

  • When the wheel is slipping. (To use the ICC system, make sure the wheels are no longer spinning, push the ICC MAIN switch to turn OFF the ICC system and reset the ICC system by pushing the ICC MAIN switch again.)

Cancel Conditions

1. When own Nissan Sentra vehicle is travelling below the speed of 30 km/h (20 MPH).

2. When the parking brake is applied.

3. When the VDC system is turned off.

4. When the VDC (including the TCS) operates.

5. When distance measurement becomes impaired due to adhesion of dirt or obstruction to the distance sensor.

6. When a wheel slips.

7. When the distance sensor signal is temporarily interrupted.

8. When the clutch pedal is depressed for approximately 8 seconds.

Conventional (fixed Speed) Cruise Control Mode Function

System Description

System Description

FUNCTION DESCRIPTION

This mode allows the driver to drive the vehicle at without depressing the accelerator pedal a fixed speed as follows:

• Between approximately 30 and 144 km/h (20 and 90 MPH)

Note:

In the conventional (fixed speed) cruise control mode, a warning chime does not sound to warn driver if own Nissan Sentra vehicle are too close to the vehicle ahead, as neither the presence of the vehicle ahead nor the vehicle-to-Nissan Sentra vehicle distance is detected.

OPERATION DESCRIPTION

To turn ON the conventional (fixed speed) cruise control mode, push and hold the ICC MAIN switch for longer than approximately 1.5 seconds when ICC system is OFF.

When pushing the ICC MAIN switch ON, the ICC system display and the ICC MAIN switch indicator are displayed on the information display.

After hold the ICC MAIN switch ON for longer than approximately 1.5 seconds, the ICC system display goes out.

The ICC MAIN switch indicator stays lit and brings the system to standby state.

Note:

To turn on the Nissan Sentra vehicle-to-vehicle distance control mode again, turn OFF the system and quickly push (less than 1.5 seconds) the ICC MAIN switch.

ADAS control unit 2 performs the control as per the following:

Constant speed

Comparing the set Nissan Sentra vehicle speed with the current vehicle speed, transmits the command to ECM via CAN communication to reach the set Nissan Sentra vehicle speed, and controls electronic throttle control actuator.

Set Condition

The system control is started by pressing SET- switch when the system is in standby state and the Nissan Sentra vehicle speed is as follows:

• Between approximately 30 and 144 km/h (20 and 90 MPH)

Cancel conditions

1. When the parking brake is applied.

2. When the VDC (including the traction control system) operates.

3. When a wheel slips.

4. When the clutch pedal is depressed for longer than approximately 8 seconds.

5. When the engine speed becomes approximately 950 rpm or less.