System Diagram

WARNING: This page is about a different car, the 2020 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.

Courtesy of NISSAN NORTH AMERICA, INC.

Component parts	Function
AWD control unit (Includes AWD actuator relay)	Refer to Component Description .
Electric controlled coupling	Refer to Component Description .
AWD solenoid	Refer to Component Description .
ABS actuator and electric unit (control unit)	Transmits the following signals to AWD control unit via CAN communication: Wheel speed signal from all wheels ABS operation signal TCS operation signal VDC operation signal Yaw rate sensor signal Side G sensor signal Decel G sensor signal
ECM	Transmits the following signals to AWD control unit via CAN communication: Accelerator pedal position signal Engine speed signal Engine torque signal Engine status signal
TCM	Transmits the following signals to AWD control unit via CAN communication: Gear position signal
BCM	Transmits the following signals to AWD control unit via CAN communication: Brake status signal
Combination meter	Transmits the following signals to AWD control unit via CAN communication. Parking brake status signal Odometer signal
Combination meter	Receives the following signal via CAN communication from AWD control unit: AWD warning icon/display signal
Chassis control module (with built in steering angle sensor)	Transmits the following signal via CAN communication to AWD control unit: Steering angle signal

OPERATION CHARACTERISTIC

Vehicle Starts Control

From a standing start, torque distribution for front and rear wheels fixed by the AWD control unit, and a stable start is achieved.
Makes stable driving with minimal wheel spin possible on snowy roads or other slippery surfaces.

Normal Control

On roads that do not require AWD, it contributes to improved fuel economy by commanding conditions close to front-wheel-drive, resulting in better fuel efficiency.
When wheel spin occurs at a front wheel, the AWD Control unit commands and distributes optimum torque to the rear wheels and enhances stable driving.
The vehicle cornering status is determined according to input information from each sensor. Optimum torque is distributed to the rear wheels to prevent tight cornering/braking symptoms.