Nissan Murano: System Description / System. Power Distribution System

Nissan Murano (Z52) 2015-2024 Service Manual / Electrical & Power Control / Power Control System :: Power Distribution System / System Description / System. Power Distribution System

System Description

SYSTEM DIAGRAM

Signal transmission function list

Signal name	Input	Output	Description
Push-button ignition switch signal	Push-button ignition switch	BCM	Transmits the push-button ignition switch signal to the BCM.
ACC/ON indicator lamp signal	BCM	Push-button ignition switch	Activates/deactivates push-button ignition switch illumination using the ACC/ON indicator lamp signal.
Stop lamp switch signal	Stop lamp switch	BCM	Transmits the stop lamp switch signal to the BCM.
Detent switch signal	CVT shift selector (detent switch)	BCM	Transmits the detent switch signal to the BCM.
P/N position signal	Transmission range switch	BCM	Transmits the P/N position signal to the BCM.
Ignition relay-1 control signal	BCM	IPDM E/R	Transmits the ignition relay-1 control signal to the IPDM E/R.
Push-button ignition switch ON signal	BCM	IPDM E/R (CAN)	Transmits the push-button ignition switch ON signal via CAN communication.
Push-button ignition switch status signal	IPDM E/R	BCM (CAN)	Transmits the push-button ignition switch status signal via CAN communication.

SYSTEM DESCRIPTION

PDS (POWER DISTRIBUTION SYSTEM) is the system that BCM controls with the operation of the push-button ignition switch and performs the power distribution to each power circuit. This system is used instead of the mechanical power supply changing mechanism with the operation of the conventional key cylinder.
The push-button ignition switch can be operated when Intelligent Key is in the following condition:
- Intelligent Key is in the detection area of the inside key antenna.
- Intelligent Key backside is contacted to push-button ignition switch.
The push-button ignition switch operation is input to BCM as a signal. BCM changes the power supply position according to the status of the push-button ignition switch and operates the following relays to supply power to each power circuit:
- Ignition relay-1 (IPDM E/R)
- Ignition relay-2 [Fuse block (J/B)]
- Accessory relay-1 [Fuse block (J/B)]
- Front blower motor relay [Fuse block (J/B)]
  
  NOTE:
  The engine switch operation changes due to the conditions of brake pedal, selector lever and Nissan Murano vehicle speed.
The power supply position can be confirmed with the lighting of the indicators in the push-button ignition switch.

IGNITION BATTERY SAVER SYSTEM

When all the following conditions are met for a period of time, the battery saver system will turn off the power supply (push-button ignition switch ON/ACC → OFF) to prevent battery discharge:

Push-button ignition switch is in ACC or ON
Turn signal lamp is not in operation
Selector lever is in the P (park) position

Reset Condition of Ignition Battery Saver System

If any of the following conditions are met, the battery saver system is released:

Push-button ignition switch is not in ACC or ON
Turn signal lamp is in operation
Selector lever is not in the P (park) position

NOTE:

The ignition battery saver system can be temporarily disabled, without using CONSULT, to prevent it from functioning when performing trouble diagnosis. Refer to Work Procedure.

POWER SUPPLY POSITION CHANGE TABLE BY PUSH-BUTTON IGNITION SWITCH OPERATION

The power supply position changing operation can be performed with the following operations:

NOTE:

When an Intelligent Key is within the detection area of inside key antenna and when Intelligent Key backside is contacted to push-button ignition switch, it is equivalent to the operations below.

When starting the engine, the BCM monitors under the engine start conditions:

Brake pedal operating condition

Selector lever position

Nissan Murano Vehicle speed

Vehicle speed: less than 2.5 MPH (4 km/h)

Power supply position	Engine start/stop condition		Push-button ignition switch operation frequency
Power supply position	Selector lever position	Brake pedal operation condition	Push-button ignition switch operation frequency
OFF → ACC	—	Not depressed	1
OFF → ACC → ON	—	Not depressed	2
OFF → ACC → ON → OFF	—	Not depressed	3
OFF → START ACC → START ON → START	P or N position	Depressed	1
Engine is running → OFF	—	—	1

Vehicle speed: 2.5 MPH (4 km/h) or more

Power supply position	Engine start/stop condition		Push-button ignition switch operation frequency
Power supply position	Selector lever position	Brake pedal operation condition	Push-button ignition switch operation frequency
Engine is running → ACC	—	—	Emergency stop operation
Engine stall return operation while driving	N position	Not depressed	1

Emergency stop operation

Press and hold the push-button ignition switch for 2 seconds or more.
Press the push-button ignition switch 3 times or more within 1.5 seconds.

Component Parts. Power Distribution System

Component Parts Location A. Front of center console B. Instrument lower panel LH No. Component Function 1. Push-button ignition switch Refer to Push-Button Ignition Switch...

Diagnosis System (ipdm E/r)

D..

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