Nissan Pathfinder: Power Control System - System Description

Nissan Pathfinder (R53) 2022-2025 Service Manual / Electrical & Power Control :: Power Control System / Ipdm E/r / System Description

Component Parts
System
Diagnosis System (ipdm E/r)

Component Parts Nissan Pathfinder SUV

Ipdm E/r

Component Parts Location

No.	Component	Function
1.	IPDM E/R (Intelligent Power Distribution Module Engine Room)	Refer to System Description.

System Nissan Pathfinder 2022

Relay Control System

System Description

SYSTEM DIAGRAM

DESCRIPTION

The IPDM E/R activates the internal control circuit to perform relay ON-OFF control according to the input signals from various sensors and the request signals received from control units via CAN communication.

NOTE:

IPDM E/R integrated relays cannot be removed.

Control relay	Input/output	Transmit unit	Control part	Reference
Front wiper relay Front wiper high relay	Front wiper request signal	BCM (CAN)	Front wiper motor	System Description (With Rain Sensing From Wipers) or System Description (Without Rain Sensing From Wipers)
Front wiper relay Front wiper high relay	Front wiper stop position signal	Front wiper motor	Front wiper motor
Starter relay	Ignition switch ON signal	BCM (CAN)	Starter motor	System Description (without stop/start system) or System Description (with stop/start system)
	Cranking enable (ECM) signal	ECM (CAN)
	Cranking enable (TCM) signal	TCM (CAN)
Ignition relay	Ignition switch ON signal	BCM (CAN)	Each control unit, sensor, actuator, relay (Ignition power supply)	—
Ignition relay	Nissan Pathfinder Vehicle speed signal	ABS actuator and electric unit (control unit) (CAN)		—

NOTE:

ECM controls the following relays:

ECM relay

Fuel pump relay

Throttle control motor relay

Smart Field-Effect Transistor (fet)

System Description

SYSTEM DESCRIPTION

A Smart Field-Effect Transistor (FET) is a transistor used to monitor and control current flow on module outputs. The IPDM E/R uses a Smart FET protection strategy to prevent module damage in the event of excessive current flow. The Smart FET protection strategy monitors its outputs for excessive current, and when a fault occurs, shuts down the output and records a DTC.

COMPONENT FUNCTION WITHIN SYSTEM

The Smart FET turns the each lamps ON according to the request from the BCM.
The Smart FET turns the A/C compressor (magnetic clutch) ON according to the request from the ECM.

INDIVIDUAL COMPONENT FUNCTION

The Smart FET supplies power supply voltage to the each lamp and the A/C compressor (magnetic clutch).

COMPONENT OPERATION

The Smart FET, that uses MOS field effect transistor, is adopted for each lamp and the A/C compressor (magnetic clutch) control.

NOTE:

A MOS field effect transistor is a transistor in which the gate is composed of a metal-oxide-semiconductor (MOS). Field effect transistor is controlled by voltage, while ordinary transistor is controlled by current. Electrode of field effect transistor is called source, drain, or gate, while electrode of ordinary transistor is called emitter, collector, or base.

Power Control System

System Description

SYSTEM DIAGRAM

Component	Function
Smart FET	Refer to Component Description.
Headlamp (HI)	The IPDM E/R supplies power supply voltage to each lamp, and turns the each lamp ON.
Headlamp (LO)
Parking lamp
License plate, side marker and tail lamp
Daytime running light
Front fog lamp
A/C compressor (magnetic clutch)	The IPDM E/R supplies power supply voltage to the A/C compressor (magnetic clutch), and turns the magnet clutch ON.
Cooling fan module	The IPDM E/R controls each actuator.
A/C compressor (ECV)	The IPDM E/R controls each actuator.

INPUT SIGNAL AND OUTPUT SIGNAL

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

Component parts	Signal description
BCM	The BCM transmits the ON/OFF request signal for each lamp to IPDM E/R via CAN communication.
ECM	The ECM calculates the cooling level, and transmits the cooling fan speed request signal to the IPDM E/R via CAN communication. The ECM transmits the A/C compressor request signal to the IPDM E/R via CAN communication according to the status of the engine and refrigerant pressure.
A/C auto amp.	The A/C auto amp. transmits the ECV control signal to the IPDM E/R via CAN communication.
IPDM E/R	The IPDM E/R controls the Smart FET to control each lamp according to the control signal status of each lamp received from the BCM via CAN communication. Refer to the following: Headlamp system: Refer to System Description . Daytime running light system: Refer to System Description . Parking, license plate, side marker and tail lamp system: Refer to System Description. Front fog lamp system: Refer to System Description. The IPDM E/R controls the Smart FET to control the A/C compressor (magnetic clutch) according to the A/C compressor request signal received from the ECM via CAN communication. Refer to System Description. The IPDM E/R controls the cooling fan module according to the cooling fan speed request signal received from the ECM via CAN communication. Refer to System Description. The IPDM E/R controls the ECV (Electrical Control Valve) according to the ECV control signal received from the A/C auto amp. via CAN communication. Refer to System Description.

Power Consumption Control System

System Description

SYSTEM DIAGRAM

INPUT SIGNAL AND OUTPUT SIGNAL

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

Component parts	Signal description
BCM	BCM transmits sleep wake up signal to each unit when condition is established, and then goes into each mode. BCM transmits sleep wake up signal (sleep) to each unit when condition is established, and then goes into each mode. BCM transmits sleep wake up signal (wake up) to each unit when condition is established, and then goes into each mode. BCM receives the sleep-ready signal (ready) from each unit via CAN communication. BCM receives the sleep-ready signal (not-ready) from each unit via CAN communication.
IPDM E/R	Transmits the sleep-ready signal (ready) to BCM via CAN communication. Transmits the sleep-ready signal (not-ready) to BCM via CAN communication. Receives the sleep wake up signal from BCM via CAN communication. Receives the sleep wake up signal (sleep) from BCM via CAN communication. Receives the sleep wake up signal (wake up) from BCM via CAN communication.
Combination meter
Intelligent Key unit
AV control unit
TCU
8CH CAN gateway
ABS actuator and electric unit (control unit)
Each switch	Each switch transmits the Nissan Pathfinder vehicle status to BCM.

DESCRIPTION

Outline

IPDM E/R incorporates a power consumption control function that reduces the power consumption according to the Nissan Pathfinder vehicle status.
IPDM E/R changes its status (control mode) with the sleep wake up signal received from BCM via CAN communication.

Normal mode (wake-up)
- CAN communication is normally performed with other control units.
- Individual unit control by IPDM E/R is normally performed.
Low power consumption mode (sleep)
- Low power consumption control is active.
- CAN transmission is stopped.

Sleep Mode Activation

IPDM E/R judges that the sleep-ready conditions are fulfilled when the ignition switch is OFF and none of the conditions below are present. Then it transmits a sleep-ready signal (ready) to BCM via CAN communication.
- Outputting signals to actuators
- Output requests are being received from control units via CAN communication.
IPDM E/R stops CAN communication and enters the low power consumption mode when it receives a sleep wake up signal (sleep) from BCM and the sleep-ready conditions are fulfilled.

Wake-Up Operation

IPDM E/R changes from the low power consumption mode to the normal mode when it receives a sleep wake up signal (wake up) from the BCM or any of the following conditions are fulfilled. In addition, it transmits a sleep-ready signal (not-ready) to BCM via CAN communication to report the CAN communication start.
- Ignition switch ON
- Hood switch status changes.
- An output request is received from a control unit via CAN communication.

Signal Buffer System

System Description

SYSTEM DIAGRAM

Component	Function
Hood switch	Detects the hood condition (open or close), and inputs the hood switch signal to the IPDM E/R.
IPDM E/R	The IPDM E/R has the signal transmission function that transmits each input signal to each unit.

Signal transmission function list

Signal name	Input	Output	Description
Hood switch signal	Hood switch	Each unit (CAN)	Inputs the hood switch signal and transmits hood switch signal via CAN communication.

Energy Managment System

System Description

SYSTEM DIAGRAM

Component		Function
Battery current sensor		Detects the charging/discharging current of the battery.
Battery		Battery supplies power supply voltage to each unit and parts.
IPDM E/R		The IPDM E/R transmits the generator voltage request signal to the ECM via CAN communication according to battery voltage and the battery temperature sensor signal.
ECM		The ECM controls power generation voltage to the generator according to the request from the IPDM E/R received via CAN communication.

Signal transmission function list

Signal name	Input	Output	Description
Battery current sensor signal	Battery current sensor	IPDM E/R (LIN)	Transmits the battery current sensor signal to the IPDM E/R via LIN communication.
Generator voltage request signal	IPDM E/R	ECM (CAN)	Transmits the generator voltage request signal via CAN communication.

SYSTEM DESCRIPTION

The IPDM E/R has an energy management system that recognizes the battery status from the battery current sensor signal from the battery current sensor and battery voltage from the battery and maintains normal battery status. Refer to the following for details:

Charging system: Refer to System Description.

Diagnosis System (ipdm E/r) Nissan Pathfinder 5th Gen

CONSULT Function (IPDM E/R)

APPLICATION ITEM

CONSULT performs the following functions via CAN communication with IPDM E/R:

Diagnosis mode	Description
Self Diagnostic Result	Displays non-network DTC which the IPDM E/R memorizes.
Data Monitor	Displays the real-time input/output data from the IPDM E/R input/output data.
Work Support	Changes the setting for each setting function.
Active Test	The IPDM E/R can provide a drive signal to electronic components to check their operations.
ECU Identification	Allows confirmation of the IPDM E/R part number.
Configuration	Read and save Nissan Pathfinder vehicle specification.
Network-DTC^*	Displays network DTC which the IPDM E/R memorizes when performing "Diagnosis (All System)".

^*: Displays when performing "Diagnosis (All System)".

SELF DIAGNOSTIC RESULT

Refer to DTC Index.

DATA MONITOR

NOTE:

The following table includes information (items) inapplicable to this Nissan Pathfinder vehicle. For information (items) applicable to this vehicle, refer to CONSULT display items.

Monitor item	Description
Compressor request 1 [Off/On]	Displays the status of A/C compressor request signal received from ECM via CAN communication.
Easy fill tire alert horn req [Off/On]	NOTE: This item is indicated, but not monitored.
Cranking enable-TCM [Unknown/Prohibit/Permit/Stop]	Displays the status of cranking enable signal received from TCM via CAN communication.
Cranking enable-ECM [Prohibit/Permit/Stop/No req]	Displays the status of cranking enable signal received from ECM via CAN communication.
DTRL REQ [Off/On]	Displays the status of daytime running light request signal received from BCM via CAN communication.
COOLING FAN REQ [%]	Displays the status of cooling fan speed request signal received from BCM via CAN communication.
FR WIPER REQ [NG/HIGH/LOW/STOP/RETURN]	Displays the status of front wiper request signal received from BCM via CAN communication.
HIGH BEAM REQ [Off/On]	Displays the status of high beam request signal received from BCM via CAN communication.
Horn request [No req/Off/Panic/Hrn chirp/Thft warn/Return/Unknown]	NOTE: This item is indicated, but not monitored.
Low beam request [Off/On]	Displays the status of low beam request signal received from BCM via CAN communication.
POSITION LIGHT REQ [Off/On]	Displays the status of position light request signal received from BCM via CAN communication.
IGNITION SW [Off/No request/On/START]	Displays the status of ignition switch ON signal received from BCM via CAN communication.
FRONT FOG LAMP REQ [Off/On]	Displays the status of front fog light request signal received from BCM via CAN communication. NOTE: This item is monitored only on the Nissan Pathfinder vehicle with front fog lamp.
Shift position [NG/M/D/N/R/P]	Displays the status of shift position signal received from TCM via CAN communication.
COMP ECV STATUS [NG/OK]	Displays the status of compressor (ECV) malfunction diagnosis that IPDM E/R transmits via CAN communication.
BATTERY VOLTAGE [V]	Displays the status of battery voltage value that IPDM E/R transmits via CAN communication.
Stop/start status [-]	Indicates condition of start/stop system.
FR WIPER STOP POSITION [ACTIVE P/STOP P]	Displays the status of front wiper stop position signal that IPDM E/R transmits via CAN communication.
IGNITION POWER SUPPLY [Off/On]	NOTE: This item is indicated, but not monitored.
HOOD SW (CAN) [NG/OPEN/CLOSE]	Displays the status of hood switch signal that IPDM E/R transmits via CAN communication. NOTE: This item is monitored only on the Nissan Pathfinder vehicle with stop/start system.
A/C RELAY [Off/On]	Displays the status of A/C compressor (magnetic clutch) output that IPDM E/R transmits via CAN communication.
REVERSE SIGNAL (CAN) [NG/On/Off]	Displays the status of reverse position signal that IPDM E/R transmits via CAN communication.
COMP ECV CURRENT [A]	Displays the status of electric current output to compressor (ECV) that IPDM E/R transmits via CAN communication.
Starter&starter cont relay stat [Off, Off/On, Off/invalid/On, On]	Displays the status of starter relay and starter control relay that IPDM E/R transmits via CAN communication.
Hood switch [Open/Close]	Displays the status of hood switch judged by IPDM E/R. NOTE: This item is monitored only on the Nissan Pathfinder vehicle with remote engine start system.
IGN RELAY [Open/Close]	Displays the status of ignition relay judged by IPDM E/R.
Cooling fan relay-2 [OFF/ON]	Displays the cooling fan relay drive status judged by IPDM E/R.
Compressor [OFF/ON]	Displays the A/C compressor (magnetic clutch) output status judged by IPDM E/R.
Front wiper HI/LO relay [OFF/ON]	Displays the front wiper high relay drive status judged by IPDM E/R.
Horn relay [OFF/ON]	NOTE: This item is indicated, but not monitored.
Front wiper relay [OFF/ON]	Displays the front wiper relay drive status judged by IPDM E/R.
Battery current sen value (LIN) [A]	Displays the status of battery current value received from battery current sensor via LIN communication.
Headlamp warning (LH) (LIN) [Open/Close]	Displays the status of low beam LH malfunction received from LED headlamp control module LH via LIN communication.
Headlamp warning (RH) (LIN) [Open/Close]	Displays the status of low beam RH malfunction received from LED headlamp control module RH via LIN communication.
Compressor ECV duty [%]	Displays the compressor (ECV) output (PWM) status of IPDM E/R.
Cooling fan relay-3 [%]	Displays the cooling fan relay output (PWM) status of IPDM E/R.
Front fog lamp (LH) [%]	Displays the front fog lamp LH output (PWM) status of IPDM E/R. NOTE: This item is monitored only on the Nissan Pathfinder vehicle with front fog lamp.
Front fog lamp (RH) [%]	Displays the front fog lamp RH output (PWM) status of IPDM E/R. NOTE: This item is monitored only on the Nissan Pathfinder vehicle with front fog lamp.
Tail lamp (LH) [%]	Displays the tail lamp LH output (PWM) status of IPDM E/R.
Tail lamp (RH) [%]	Displays the tail lamp RH output (PWM) status of IPDM E/R.
Headlamp LO (RH) [%]	Displays the headlamp (LO) RH output (PWM) status of IPDM E/R.
Headlamp LO (LH) [%]	Displays the headlamp (LO) LH output (PWM) status of IPDM E/R.
Parking lamp (LH) req (LIN) [Close/Open]	Displays the status of parking lamp LH ON/OFF control that IPDM E/R transmits via LIN communication.
DTRL (LH) req (LIN) [Close/Open]	Displays the status of daytime running light LH ON/OFF control that IPDM E/R transmits via LIN communication.
Headlamp LO (LH) req (LIN) [Close/Open]	Displays the status of headlamp LO (LH) ON/OFF control that IPDM E/R transmits via LIN communication.
Headlamp HI (LH) req (LIN) [Close/Open]	Displays the status of headlamp HI (LH) ON/OFF control that IPDM E/R transmits via LIN communication.
Parking lamp (RH) req (LIN) [Close/Open]	Displays the status of parking lamp RH ON/OFF control that IPDM E/R transmits via LIN communication.
DTRL (RH) req (LIN) [Close/Open]	Displays the status of daytime running light RH ON/OFF control that IPDM E/R transmits via LIN communication.
Parking/DTRL (LH) output (LIN) [%]	Displays the parking lamp/daytime running light LH control signal output (PWM) status that IPDM E/R transmits via LIN communication.
Parking/DTRL (RH) output (LIN) [%]	Displays the parking lamp/daytime running light RH control signal output (PWM) status that IPDM E/R transmits via LIN communication.
Headlamp HI (RH) req (LIN) [Close/Open]	Displays the status of headlamp HI (RH) ON/OFF control that IPDM E/R transmits via LIN communication.
Headlamp LO (RH) req (LIN) [Close/Open]	Displays the status of headlamp LO (RH) ON/OFF control that IPDM E/R transmits via LIN communication.
Battery status [—]	Indicates condition of battery.
T LAMP LH CIRC MALFUNCTN [―]	Monitor the number of times that the Smart FET in IPDM E/R reaches the retry upper limit of the tail lamp LH circuit. NOTE: When the number of tail lamp LH circuit retries count is 20, this item counts 1.
NMB T LAMP LH CIRC RETRY [―]	Monitor the number of times that the Smart FET in IPDM E/R permits the retry of the tail lamp LH circuit. NOTE: When the number of short circuits in the tail lamp LH circuit count is 5 and the ignition switch OFF to ON operation is detected, this item counts 1.
Fr fog lamp (LH) circ malfunctn [―]	Monitor the number of times that the Smart FET in IPDM E/R reaches the retry upper limit of the front fog lamp LH circuit. NOTE: When the number of front fog lamp LH circuit retries count is 20, this item counts 1. This item is monitored only on the Nissan Pathfinder vehicle with front fog lamp.
T LAMP RH CIRC MALFUNCTN [―]	Monitor the number of times that the Smart FET in IPDM E/R reaches the retry upper limit of the tail lamp RH circuit. NOTE: When the number of tail lamp RH circuit retries count is 20, this item counts 1.
NMB T LAMP RH CIRC RETRY [―]	Monitor the number of times that the Smart FET in IPDM E/R permits the retry of the tail lamp RH circuit. NOTE: When the number of short circuits in the tail lamp RH circuit count is 5 and the ignition switch OFF to ON operation is detected, this item counts 1.
NMB T LAMP RH CIRC SHORT [―]	Monitor the number of times that the Smart FET in IPDM E/R detects the over current of the tail lamp RH circuit.
NMB F FOG LH CIRC RETRY [―]	Monitor the number of times that the Smart FET in IPDM E/R permits the retry of the front fog lamp LH circuit. NOTE: When the number of short circuits in the front fog lamp LH circuit count is 5 and the ignition switch OFF to ON operation is detected, this item counts 1. This item is monitored only on the Nissan Pathfinder vehicle with front fog lamp.
NMB F FOG LH CIRC SHORT [―]	Monitor the number of times that the Smart FET in IPDM E/R detects the over current of the front fog lamp LH circuit. NOTE: This item is monitored only on the Nissan Pathfinder vehicle with front fog lamp.
F FOG RH CIRC MALFUNCTN [―]	Monitor the number of times that the Smart FET in IPDM E/R reaches the retry upper limit of the front fog lamp RH circuit. NOTE: When the number of front fog lamp RH circuit retries count is 20, this item counts 1. This item is monitored only on the Nissan Pathfinder vehicle with front fog lamp.
NMB F FOG RH CIRC RETRY [―]	Monitor the number of times that the Smart FET in IPDM E/R permits the retry of the front fog lamp RH circuit. NOTE: When the number of short circuits in the front fog lamp RH circuit count is 5 and the ignition switch OFF to ON operation is detected, this item counts 1. This item is monitored only on the Nissan Pathfinder vehicle with front fog lamp.
NMB F FOG RH CIRC SHORT [―]	Monitor the number of times that the Smart FET in IPDM E/R detects the over current of the front fog lamp RH circuit. NOTE: This item is monitored only on the Nissan Pathfinder vehicle with front fog lamp.
NMB T LAMP LH CIRC SHORT [―]	Monitor the number of times that the Smart FET in IPDM E/R detects the over current of the tail lamp LH circuit.
BAT DISCHARGE COUNT [―]	Monitor the cumulative discharge value of the battery. NOTE: When 65000 or more is counted, replace the battery. This item is monitored only on the Nissan Pathfinder vehicle with Stop/Start system.