Nissan Pathfinder: Lan System - System Description

• Component Parts
• System

Component Parts Nissan Pathfinder 2022

Component Parts Location

	ECM		Electric intake valve timing control module		A/C auto amp.
	IPDM E/R		Intelligent Key unit		8CH CAN gateway
	Head Up Display unit		Chassis control module		Front camera unit
	Combination meter		AV control unit		Steering angle sensor
	BCM		Data link connector		Automatic back door control unit
	Side radar LH		Side radar RH		BOSE speaker amp.
	4WD control unit		Driver seat control unit		Around view monitor control unit
	Wireless charger unit		Electric shift control module		Sonar control unit
	Air bag diagnosis sensor unit		ADAS control unit 2		TCU
	Automatic drive positioner control unit		EPS control unit		TCM
	ABS actuator and electric unit (control unit)		Distance sensor

System Nissan Pathfinder 5th Gen

Can Communication System

System Description

SYSTEM DIAGRAM

With Automatic Emergency Braking

Without Automatic Emergency Braking

DESCRIPTION

• CAN (Controller Area Network) is a serial communication line for real time application. It is an on-Nissan Pathfinder vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a Nissan Pathfinder vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

• The following control units connect to CAN communication circuits.

  CAN communication circuit	Control unit	Reference
  Between the following circuits. Nissan Pathfinder Vehicle CAN communication 1 circuit Vehicle CAN communication 2 circuit Nissan Pathfinder Vehicle CAN communication 3 circuit	BCM	System Description
  Between the following circuits. Nissan Pathfinder Vehicle CAN communication 3 circuit ITS CAN communication 1 circuit ITS CAN communication 4 circuit Chassis CAN communication 3 circuit Drivetrain CAN communication 2 circuit IT CAN communication circuit Diagnostic CAN communication circuit	8CH CAN gateway	8CH CAN Gateway
  Between the following circuits. (With Automatic Emergency Braking) ITS CAN communication 1 circuit ITS CAN communication 2 circuit ITS CAN communication 3 circuit ITS CAN communication 4 circuit	ADAS control unit 2	ADAS Control Unit 2
  Between the following circuits. Chassis CAN communication 1 circuit Chassis CAN communication 2 circuit Chassis CAN communication 3 circuit Chassis CAN communication 4 circuit Drivetrain CAN communication 1 circuit	Chassis control module	Chassis Control Module
  Between the following circuits. (with Intelligent around view monitor system) ITS CAN communication 1 circuit ITS CAN communication 4 circuit ITS CAN communication 5 circuit	Around view monitor control unit	Around View Monitor Control Unit
  ITS CAN communication 4 circuit ⇔ ITS CAN communication 5 circuit	Sonar control unit	Sonar Sensor
  Chassis CAN communication 2 circuit ⇔ Chassis CAN communication 4 circuit	ABS actuator and electric unit (control unit)	ABS Actuator and Electric Unit (Control Unit)
  Between the following circuits. Drivetrain CAN communication 1 circuit Drivetrain CAN communication 2 circuit Engine CAN communication circuit	ECM	ECM (With Barometric Pressure Sensor)
  Drivetrain CAN communication 1 circuit ⇔ Drivetrain CAN communication 2 circuit	TCM	TCM

CAN Communication Signal Generation

• Termination circuits (resistors) are connected across the CAN communication system. When transmitting a CAN communication signal, each control unit passes a current to the CAN-H line and the current returns to the CAN-L line.

  

• The current flows separately into the termination circuits connected across the CAN communication system and the termination circuits drop voltage to generate a potential difference between the CAN-H line and the CAN-L line.

  

  NOTE:

  A signal with no current passage is called “Recessive” and one with current passage is called “Dominant”.

• The system produces digital signals for signal communications, by using the potential difference.

  

The Construction of CAN Communication Signal (Message)

CAN Communication Line

The CAN communication line is a twisted pair wire consisting of strands of CAN-H and CAN-L and has noise immunity.

NOTE:

The CAN communication system has the characteristics of noise-resistant because this system produces digital signals by using the potential difference between the CAN-H line and the CAN-L line and has the twisted pair wire structure.

CAN Signal Communications

Each control unit of the CAN communication system transmits signals through the CAN communication control circuit included in the control unit and receives only necessary signals from each control unit to perform various kinds of control.

• Example: Transmitted signals

  

• Example: Received signals

  

NOTE:

The above signal names and signal communications are provided for reference purposes. For CAN communications signals of this Nissan Pathfinder vehicle, refer to CAN Communication Signal Chart.

CAN Communication Control Circuit

CAN communication control circuit is incorporated into the control unit and transmits/receives CAN communication signals.

*: These are the only control units wired with both ends of CAN communication system.

CAN System Specification Chart

Determine CAN system type from the following specification chart.

NOTE:

Refer to Trouble Diagnosis Flow Chart for how to use CAN system specification chart.

×: Applicable

Vehicle Equipment Identification Information

NOTE:

Check CAN system type from the vehicle shape and equipment.

	Front camera unit		Telematics switch		Automatic back door switch
	Side camera RH		Wireless charger indicator		Front tweeter RH (BOSE logo)
	Seat memory switch		Head Up Display switch		ADP (automatic drive positioner) steering switch
	With Forward Emergency Braking		With telematics system		With automatic back door system
	With Intelligent around view monitor system		With wireless charger		With BOSE audio system
	With automatic drive positioner system (seat position)		With Head Up Display		With automatic drive positioner system (steering column position)

CAN Communication Signal Chart

Refer to How to Use CAN Communication Signal Chart for how to use CAN communication signal chart.

NOTE:

Refer to Abbreviation List for the abbreviations of the connecting units.

T: Transmit R: Receive