System Diagram

WARNING: This page is about a different car, the 2021 Nissan Rogue. However, it is still accessible from the selected car via links, so may be relevant.

Courtesy of NISSAN NORTH AMERICA, INC.

Component	Function
Intelligent Key	Operates based on the results of electronic ID verification using two-way communication between the Intelligent Key and the vehicle (Intelligent Key unit).
Door request switch	Detects door lock/unlock operation.
Push-button ignition switch	Refer to Push-button Ignition Switch .
Door switch	Detects door open/close condition.
Combination switch (Lighting & turn signal switch)	Inputs the each switch condition signal to BCM.
Front power window motor LH	Transmits front power window open/close signal to BCM via LIN communication.
Intelligent Key unit	Transmits push-button ignition switch status signal and door lock/unlock request signal to BCM via CAN communication.
ABS actuator and electric unit (control unit)	Transmits vehicle speed signal (ABS) to BCM via CAN communication.
TCU	Transmits auto ACC request signal to BCM via CAN communication.
BCM	BCM operates the auto ACC function based on each signal state.
Accessory relay	Controlled by BCM and turns ON/OFF the battery power supply to each parts.
Audio/Navigation	Transmits auto ACC request signal to BCM via CAN communication. Auto ACC status signal receives from BCM via CAN communication.