Nissan Pathfinder: Body Control System - System

• Body Control System
• Combination Switch Reading System
• Signal Buffer System
• Power Consumption Control System
• Shipping Mode Control System

Body Control System Nissan Pathfinder

System Description

OUTLINE

• The BCM controls the various electrical components. It inputs the information required for control via CAN communication and the signal received from each switch and sensor.

• The BCM has a combination switch reading function for reading the operation status of the combination switches (light, turn signal, wiper and washer) in addition to a function for controlling the operation of various electrical components. It also has the signal transmission function as the passed point of the signal and a power saving control function that reduces power consumption with the ignition switch OFF.

• The BCM is equipped with the diagnosis function that performs diagnosis and various settings with CONSULT.

BCM CONTROL FUNCTION LIST

MAC (MESSAGE AUTHENTICATION CODE)

MAC (Message Authentication Code) is a function that prevents unauthorized communication from other than the ECU with MAC function by secure authentication communication. BCM can write a MAC key required for communication between the ECUs and perform MAC diagnosis.

Combination Switch Reading System Nissan Pathfinder 2025

System Description

SYSTEM DIAGRAM

OUTLINE

• The BCM reads the status of the combination switch and recognizes the status of each switch.

• The BCM has a combination of 6 input terminals (INPUT 1 - 6) and 6 output terminals (OUTPUT 1 - 6) and reads a maximum of 22 switch states.

COMBINATION SWITCH MATRIX

COMBINATION SWITCH READING FUNCTION

Description

• The BCM reads the status of the combination switch at 10 ms intervals normally.

  

• The BCM operates as follows and judges the status of the combination switch:

  • It operates the transistor on the INPUT side in the following order: OUTPUT 6–> 5 –> 4 –> 3 –> 2 –> 1, and outputs voltage waveform.

  • The voltage waveform of OUTPUT corresponding to the formed circuit is input into the interface on the INPUT side if any (1 or more) switches are ON.

  • It reads this change of the voltage as the status signal of the combination switch.

    

Operation Example

In the following operation example, the combination of the status signals of the combination switch is replaced as follows: INPUT 1 - 6 to “ - ” and OUTPUT 1 - 6 to “ - ”.

Example 1: When a switch (Turn signal RH) is turned ON

• The circuit between INPUT 3 ( ) and OUTPUT 5 ( ) is formed when the Turn signal RH is turned ON.

  

• The BCM detects the combination switch status signal “ ” when the signal of INPUT 3 is input to OUTPUT 5.

• The BCM judges that the Turn signal RH is ON when the signal “ ” is detected.

Example 2: When multiple switches (Front fog switch, Turn signal RH) are turned ON

• The circuits between INPUT 1 ( ) and OUTPUT 5 ( ) and between INPUT 3 ( ) and OUTPUT 5 ( ) are formed when the Front fog switch and Turn signal RH are turned ON.

  

• The BCM detects the combination switch status signal “ ” when the signals of INPUT 1 and INPUT 3 are input to OUTPUT 5.

• The BCM judges that the Front fog switch and Turn signal RH are ON when the signal “ ” is detected.

WIPER INTERMITTENT DIAL POSITION (WITH WIPER INTERMITTENT DIAL POSITION)

The BCM judges the wiper intermittent dial 1 - 5 by the status of INT volume 1, 2 and 3 switches.

NOTE:

For details of wiper intermittent dial position: Refer to System Description (With Rain Sensing From Wipers) or System Description (Without Rain Sensing From Wipers).

Signal Buffer System Nissan Pathfinder R53

System Description

SYSTEM DIAGRAM

OUTLINE

BCM has the signal transmission function that transmits each input signal to each unit.

Signal transmission function list

Power Consumption Control System Nissan Pathfinder SUV

System Description

SYSTEM DIAGRAM

INPUT SIGNAL AND OUTPUT SIGNAL

Major signal transmission between each unit via communication lines is shown in the following table:

OUTLINE

BCM incorporates a power saving control function that reduces power consumption according to the vehicle status.

Low power consumption mode (sleep)

• CAN transmission is stopped to other units

• Each control with BCM is operating low power consumption mode

Normal mode (wake-up)

• CAN communication is normally performed

• Each control with BCM is operating normally

Low power consumption mode activation

• BCM receives the sleep-ready signal from each unit via CAN communication.

• BCM transmits the sleep wake up signal (sleep) to each unit when it receives the sleep-ready signal from each unit.

• Each unit stops the transmission of CAN communication with the sleep wake up signal (sleep).

• BCM performs low power consumption control when fulfilled with all sleep conditions.

  Sleep condition
  Ignition switch OFF (not auto ACC status) Interior room lamp power supply OFF Navigation and audio system OFF

Wake-up operation

• BCM transmits sleep wake up signal (wake up) to each unit when sleep conditions change, and then goes into normal mode from low power consumption mode.

• Each unit starts transmissions with CAN communication by receiving the sleep wake up signal (wake up).

• BCM stops low power consumption control when fulfilled with any wake up conditions.

  Wake up condition
  Ignition switch OFF → ON Door closed → opened Door lock / unlock operation

Shipping Mode Control System Nissan Pathfinder SUV

System Description

SYSTEM DIAGRAM

Signal transmission function list

DESCRIPTION

• BCM switches the status (shipping mode or normal mode) by itself according to the extended storage fuse switch condition, and transmits shipping mode status signal to combination meter and each unit via CAN communication.

• When the shipping mode function operates, each control unit does not detect DTCs.

• BCM control functions are limited in shipping mode. Refer to Description.

• The combination meter displays extended storage fuse warning message on the information display, when BCM is in shipping mode.

Squeak and Rattle Trouble Diagnoses ++Meter, Warning Lamp & Indicator