Nissan Frontier D40. Manual - part 877

PCS-8

< FUNCTION DIAGNOSIS >

[IPDM E/R]

POWER DISTRIBUTION SYSTEM

POWER DISTRIBUTION SYSTEM

System Description

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INPUT/OUTPUT SIGNAL CHART

SYSTEM DESCRIPTION

• PDS (POWER DISTRIBUTION SYSTEM) is the system that BCM controls with the operation of the ignition

switch and performs the power distribution to each power circuit.

• The ignition switch operation is input to BCM as a signal. BCM changes the power supply position according

to the status and operates the ignition relay (inside IPDM E/R) to supply power to each power circuit.

Component Parts Location

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Component Description

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Switch

Input Signal to BCM

BCM system

Actuator

Ignition switch

Ignition switch

Power distribution system

• Ignition relay (IPDM E/R)
• ACC relay
• Blower relay

A/T shift selector

P range

Transmission range switch

N, P range

1.

IPDM E/R (contains ignition relay) E118, E119, 
E120, E121, E122, E123, E124

2.

BCM (view with lower instrument panel LH re-
moved) M18, M19, M20

ALMIA0312ZZ

BCM

Reference

IPDM E/R

PCS-6

Ignition relay (in IPDM E/R)

PCS-6

Transmission range switch

TM-163

PCS

POWER CONTROL SYSTEM

PCS-9

< FUNCTION DIAGNOSIS >

[IPDM E/R]

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POWER CONTROL SYSTEM

System Diagram

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System Description

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COOLING FAN CONTROL

IPDM E/R controls the cooling fan according to the status of the cooling fan speed request signal received
from ECM via CAN communication. Refer to 

LAN-4, "System Description"

.

AWMIA0527GB

PCS-10

< FUNCTION DIAGNOSIS >

[IPDM E/R]

SIGNAL BUFFER SYSTEM

SIGNAL BUFFER SYSTEM

System Diagram

INFOID:0000000005275993

System Description

INFOID:0000000005275994

IPDM E/R reads the status of the oil pressure switch and transmits the oil pressure switch signal to BCM via
CAN communication. Refer to 

LAN-4, "System Description"

.

AWMIA1129GB

PCS

POWER CONSUMPTION CONTROL SYSTEM

PCS-11

< FUNCTION DIAGNOSIS >

[IPDM E/R]

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POWER CONSUMPTION CONTROL SYSTEM

System Diagram

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System Description

INFOID:0000000005275996

OUTLINE

• IPDM E/R incorporates a power consumption control function that reduces the power consumption accord-

ing to the vehicle status. 

• IPDM E/R changes its status (control mode) with the sleep wake up signal received from BCM via CAN com-

munication.

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 communica-
tion.

- Front wiper fail-safe operation 
- Outputting signals to actuators
- Switches or relays operating
- Auto active test is starting
- Emergency OFF
- 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 BCM or any of the following conditions is 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
- An output request is received from a control unit via CAN communication.

ALCIA0030GB