Nissan Sentra B18 (2020-2025) Service Manual / Electrical & Power Control / Power Control System :: Ipdm E/r / System Description / System

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

Relay Control System

System Description

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
Front wiper relay Front wiper high relay	Front wiper stop position signal	Front wiper motor	Front wiper motor	System Description
Starter relay	Ignition switch ON signal	BCM (CAN)	Starter motor	System Description
	Cranking enable (ECM) signal	ECM (CAN)
	Cranking enable (TCM) signal¹	TCM (CAN)¹
	Clutch switch signal²	BCM (CAN)
	Neutral position signal²	Park/neutral position (PNP) switch²
Ignition relay-1	Ignition switch ON signal	BCM (CAN)	Each control unit, sensor, actuator, relay (ignition power supply)	—
Ignition relay-1	Nissan Sentra Vehicle speed signal	ABS actuator and electric unit (control unit) (CAN)		—

¹: With CVT

²: With M/T

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 Description

SYSTEM DIAGRAM

Description
Component	Function
Smart FET	Refer to Component Description.
Headlamp (high)	The IPDM E/R supplies power supply voltage to each lamp, and turns the each lamp ON.
Headlamp (low)
Parking, license plate, side marker and tail lamp
Daytime running light
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 control 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 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.¹	The A/C auto amp.¹ or A/C amp.² transmits the ECV control signal to the IPDM E/R via CAN communication.
A/C amp.²
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 (halogen headlamps) or System Description (LED headlamps) . Daytime running light system: Refer to System Description (LED headlamps) . Parking, license plate, side marker and tail lamp system: Refer to System Description (halogen headlamps) or System Description (LED headlamps). 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 (auto A/C) or System Description (manual A/C). The IPDM E/R controls the cooling fan control 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 A/C compressor (ECV) according to the ECV control signal received from the A/C auto amp.¹ or A/C amp.² via CAN communication. Refer to System Description (auto A/C) or System Description (manual A/C).

¹: Auto A/C

²: Manual A/C

Power Consumption Control System

System Description

System Description

SYSTEM DIAGRAM

INPUT SIGNAL AND OUTPUT SIGNAL

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

Component parts	Signal description
IPDM E/R	Each unit transmits the sleep-ready signal (ready) to the BCM when all of the CAN sleep conditions are fulfilled. Each unit transmits the sleep-ready signal (not-ready) to the BCM when all of the CAN sleep conditions are fulfilled. Each unit receives the sleep wake up signal (sleep) from the BCM via CAN communication. Each unit receives the sleep wake-up signal (wake up) from the BCM via CAN communication.
Combination meter
Intelligent Key unit
AV control unit
8CH CAN gateway
BCM	BCM transmits the sleep wake up signal (sleep) to each unit when all of the CAN sleep conditions are fulfilled. BCM transmits the sleep wake-up signal (wake up) to each unit when all of the CAN sleep conditions are fulfilled. BCM receives the sleep-ready signal (ready) from each unit via CAN communication. BCM receives the sleep-ready signal (not-ready) signal from each unit via CAN communication.

DESCRIPTION

Outline

The IPDM E/R incorporates a power consumption control function that reduces the power consumption according to the Nissan Sentra vehicle status.
The 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
- Switches or relays operating
- 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

The 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 when any of the following conditions are fulfilled. In addition, it transmits a sleep-ready signal (not-ready) to the BCM via CAN communication to report the CAN communication start.
- Ignition switch ON
- An output request is received from a control unit via CAN communication.

Ignition Battery Saver Logic

If the ignition switch is ON for a period of time with the engine OFF, the IPDM E/R and BCM turn OFF to save the battery.

Signal Buffer System

System Description

System Description

SYSTEM DIAGRAM

Description
Component	Function
Park/neutral (PNP) switch ^*	Transmits the neutral position signal to the IPDM E/R.
Hood switch	Detects the hood condition (open or close), and transmits 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.

^*: With M/T

Signal transmission function list

Signal name	Input	Output	Description
Reverse position signal	Park/neutral (PNP) switch^*	Each unit (CAN)	Inputs the reverse position signal and transmits it via CAN communication.
Neutral position signal	Park/neutral (PNP) switch^*	Each unit (CAN)	Inputs the neutral position signal and transmits it via CAN communication.
Hood switch signal	Hood switch	Each unit (CAN)	Inputs the hood switch signal and transmits it via CAN communication.

^*: With M/T

Energy Managment System

System Description

System Description

SYSTEM DIAGRAM

Description
Component		Function
Battery current sensor	Current sensor	Detects the charging/discharging current of the battery.
Battery current sensor	Temperature sensor	Detects the temperature around 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	Transmits the battery current sensor signal to the IPDM E/R.
Battery temperature sensor signal	Battery current sensor	IPDM E/R	Transmits the battery temperature sensor signal to the IPDM E/R.
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 signal from the battery current sensor, the battery temperature sensor signal, and the battery voltage from the battery and maintains normal battery status. Refer to the following for details:

Charging system: Refer to System Description.

Component Parts

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Diagnosis System (ipdm E/r)

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