System Description

SYSTEM DIAGRAM

Courtesy of NISSAN NORTH AMERICA, INC.

INPUT SIGNAL AND OUTPUT SIGNAL

Component	Signal description
AV control unit	Mainly transmits the following signals to A/C auto amp. via CAN communication: Heated steering wheel ON/OFF signal Heated steering wheel AUTO function ON/OFF signal Mainly receives the following signals from Integral switch via AV communication: Heated steering wheel ON/OFF signal Heated steering wheel AUTO function ON/OFF signal
A/C auto amp.	Transmits the heated steering wheel relay signal to heated steering wheel relay.
Integral switch	Mainly transmits the following signals to AV control unit via AV communication: Heated steering wheel function ON/OFF signal Heated steering wheel AUTO function ON/OFF signal

Component

Signal description

AV control unit

Mainly transmits the following signals to A/C auto amp. via CAN communication:

Mainly receives the following signals from Integral switch via AV communication:

A/C auto amp.

Transmits the heated steering wheel relay signal to heated steering wheel relay.

Integral switch

Mainly transmits the following signals to AV control unit via AV communication:

FUNCTION FLOW

Courtesy of NISSAN NORTH AMERICA, INC.

DESCRIPTION

Normal Control

The heated steering wheel system maintains the surface temperature of the steering wheel between 68°F (20°C) and 86°F (30°C).
Once heated steering wheel function turns ON on the integral switch display, A/C auto amp. that has received signal via AV control unit turns the heated steering wheel relay ON and electrifies to the heat elements built-in the steering wheel to heat the steering wheel.
When heated steering wheel function turns OFF, A/C auto amp. turns OFF the heated steering wheel relay and stops the electricity supply to the heat elements.
When the surface temperature of the steering wheel is higher than 86°F (30°C), the thermostat built-in the steering wheel turns OFF, and electricity to the heating element is turned OFF. When the surface temperature drops to less than 68°F (20°C), the thermostat built-in the steering wheel turns ON, and electricity to the heating element is turned ON.

Auto Control

Once heated steering wheel auto function turns ON on the integral switch display part, the heated steering wheel switches to the auto control.
Under the auto control, A/C auto amp. turns the heated steering wheel relay ON and electrifies the heat elements built in the steering wheel to heat the steering wheel when the temperature in the passenger room is low.
After the heated steering wheel relay turns ON, the electricity to the heat element switches ON/OFF corresponding to the steering wheel surface temperature as well as under the normal control.
If ON↔OFF operation of "Heated Steering Wheel" is performed on the integral switch display, the auto control is cancelled.

Timer Function

The A/C auto amp. has a timer. After heated steering wheel function or heated steering wheel auto function turns ON, when operating time becomes more than the specified time (30 minutes), the A/C auto amp. turns OFF the heated steering wheel relay to stop heating.

Condition for Electrifying Heat Elements

Ignition switch	Timer function judgment result	Heated Steering Wheel Mode	Electrifying heat elements
ON	ON	Heated Steering Wheel ON	Turns ON/OFF corresponding to the steering wheel surface temperature.
		Heated Steering Wheel Auto ON	Turns ON when the passenger room temperature is low. Turns ON/OFF corresponding to the steering wheel surface temperature after electricity turns ON.
		Heated Steering Wheel OFF Heated Steering Wheel Auto OFF	OFF
	OFF	-	OFF
OFF	-	-	OFF