Nissan Pathfinder: Starting System - System Description

Nissan Pathfinder (R53) 2022-2025 Service Manual / Engine :: Starting System / System Description

Component Parts. Starting System Nissan Pathfinder R53

View with engine and transmission removed

Engine room left side

Center console

No.	Component	Function
1.	Intelligent Key unit	Intelligent Key unit transmits key signal to the BCM. Refer to Component Parts Location for detailed component location.
2.	IPDM E/R (Intelligent Power Distribution Module Engine Room)	CPU inside IPDM E/R controls starter relay. Starter relay is built into the IPDM E/R. Refer to System Description.
3.	Electric shift control module	Electric shift control module supplies power to the starter relay inside IPDM E/R when the lever is shifted to the "P" or "N" position. Refer to Component Parts Location for detailed component location.
4.	BCM (Body Control Module)	BCM controls starter cut relay. Refer to System Description.
5.	Starter motor	Refer to Starter Motor.
6.	Starter cut relay and direct fuel injector relays 1 and 2 (starter cut relay)	Power is supplied to the starter cut relay with BCM control.
7.	Push-button ignition switch	Supplies ignition switch status to the IPDM E/R.
8.	Stop/start off switch (If equipped)	Sends signal to BCM to shut off the idle stop system. Refer to Stop/Start Off Switch.

Located toward the rear of the engine, just before the transmission.
The starter motor plunger closes and the motor is supplied with battery power, which in turn cranks the engine, when the “S” terminal is supplied with electric power.
“B” terminal: The “B” terminal is constantly supplied with battery power.
“S” terminal: The starter motor magnetic switch (“S” terminal) is supplied with power when the cranking condition is satisfied.

Located on the center console, just behind the shift selector.
The stop/start off switch shuts off the idle stop system by sending a signal to the BCM.

SYSTEM DIAGRAM

INPUT SIGNAL AND OUTPUT SIGNAL CHART

Component	Signal
IPDM E/R	Transmits starter relay control signal to electric shift control module.
BCM	Transmits starter cut relay control signal to starter motor.
Stop/start off switch	Transmits stop/start off switch signal to the BCM.

SYSTEM DESCRIPTION

“B” terminal is constantly supplied with battery power.
When selector lever is P or N, power is supplied to starter relay by electric shift control module.
When starter operating condition is satisfied, IPDM E/R turns starter relay ON by starter relay control signal.
When engine cranking condition is satisfied, BCM turns starter cut relay ON by starter cut relay control signal.
Then battery power is supplied to starter motor (“S” terminal) through starter cut relay and starter relay.
Stop/start off switch shuts off idle stop system by sending signal to BCM.
When selector lever is D, and other engine criteria are met, the engine shuts down at idle, restarting when brake pedal is released.

SYSTEM DIAGRAM

INPUT SIGNAL AND OUTPUT SIGNAL CHART

Component	Signal
IPDM E/R	Transmits starter relay control signal to electric shift control module.
BCM	Transmits starter cut relay control signal to starter motor.

SYSTEM DESCRIPTION

“B” terminal is constantly supplied with battery power.
When selector lever is P or N, power is supplied to starter relay by electric shift control module.
When starter operating condition is satisfied, IPDM E/R turns starter relay ON by starter relay control signal.
When engine cranking condition is satisfied, BCM turns starter cut relay ON by starter cut relay control signal.
Then battery power is supplied to starter motor (“S” terminal) through starter cut relay and starter relay.