POWER DISTRIBUTION SYSTEM : System Description

WARNING: This page is about a different car, the 2011 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.

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
- Insert Intelligent Key into the key slot
The push-button ignition switch operation is input to BCM as a signal. BCM changes the power supply position according to the status and operates the following relays to supply power to each power circuit.
- Ignition relay (inside IPDM E/R)
- Ignition relay (inside fuse block)
- Accessory relay
- Blower relay
  NOTE: The push-button ignition switch operation changes due to the conditions of brake pedal, selector lever and vehicle speed.
The power supply position can be confirmed with the lighting of the indicators around the push-button ignition switch.

BATTERY SAVER SYSTEM

When all the following conditions are met for 60 minutes, the battery saver system will cut off the power supply to prevent battery discharge.

The ignition switch is in the ACC position
All doors are closed
Selector lever is in the P position

Reset Condition of Battery Saver System

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

Opening any door
Operating with door key cylinder on door lock
Operating with door request switch on door lock
Operating with Intelligent Key on door lock
Press push-button ignition switch and ignition switch will change to ACC position from OFF position.

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 it is inserted to the key slot, it is equivalent to the operations below.
When starting the engine, the BCM checks the following conditions and then changes the power supply position.
- Brake pedal operating condition
- Selector lever position
- Vehicle speed

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

OPERATION FREQUENCY REFERENCE CHART

Power supply position

Engine start/stop condition

Push-button ignition switch operation frequency

Selector lever

Brake pedal operation condition

LOCK⁽¹⁾ → ACC

Not depressed

LOCK⁽¹⁾ → ACC → ON

Not depressed

LOCK⁽¹⁾ → ACC → ON → OFF

Not depressed

LOCK⁽¹⁾ → START
ACC → START
ON → START

P or N position

Depressed

Engine is running → OFF

⁽¹⁾	Power supply position shifts to "LOCK" from "OFF", when ignition switch is in the OFF position, selector lever is in the P position, and any of the following conditions are met.

Closing door
Opening door
Door is locked using door request switch
Door is locked using Intelligent Key

The power supply position shifts to "ACC" when the push-button ignition switch (push switch) is pushed at "LOCK".

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

OPERATION FREQUENCY REFERENCE CHART

Power supply position	Engine start/stop condition		Push-button ignition switch operation frequency
Power supply position	Selector lever	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.