System Description: Description

WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

Power Distribution System

The 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 and operates the following relays to supply power to each power circuit:
- Ignition relay-1
- Ignition relay-2
- Accessory relay-1
- Accessory relay-2
- Front blower motor relay
  NOTE: The engine 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 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 cut off the power supply (ignition switch ON/ACC → OFF) to prevent battery discharge.

Ignition switch is in the ACC or ON position
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.

Ignition switch is not in the ACC or ON position
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
- Vehicle speed

vehicle speed: less than 4 km/h (2.5 mph)

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: 4 km/h (2.5 mph) 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.