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Home >> Infiniti >> 2021 >> QX80 Premium Select, AWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heater & Air Conditioning Control System (Diagnostics) >> Description >> Component Parts >> Rear Automatic Air Conditioning System >> Component Location

Component Location

GNSILL0309535Courtesy of NISSAN NORTH AMERICA, INC.

1.

Rear A/C control

2.

Preset switch

3.

Engine coolant temperature sensor

Refer to Component Location .

4.

ECM

Refer to Component Location .

5.

Ambient sensor

6.

Display control unit

Refer to Component Location .

7.

BCM

Refer to Component Location .

8.

Combination meter

Refer to Component Location .

9.

Sunload sensor

10.

Front display

11.

Rear A/C solenoid valve

12.

Rear mode door motor

13.

Rear air mix door motor

14.

Rear in-vehicle sensor

15.

Rear blower motor

16.

Rear A/C relay

17.

Water cut valve *1

18.

Intake sensor

19.

A/C auto amp.

A.

Left side of rear A/C unit assembly

B.

Right side of rear A/C unit assembly

C.

Back side of engine room (RH)

D.

Engine rear side of bank 1

E.

Left side of heater & cooling unit assembly

F.

Cluster lid C is removed

*1: Except for Mexico

Component

Description

Ambient sensor

Ambient sensor measures ambient air temperature. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

Display control unit

Display control unit transmits front A/C control operation signal to A/C auto amp. via CAN communication line.

A/C auto amp.

A/C auto amp. controls rear automatic air conditioning system by inputting and calculating signals from each sensor and each switch. A/C auto amp. has self-diagnosis function. Diagnosis of rear automatic air conditioning system can be performed quickly.

BCM

BCM transmits key ID signal to A/C auto amp. via CAN communication line.

Combination meter

Combination meter transmits vehicle speed signal to A/C auto amp. via CAN communication line.

ECM

ECM transmits engine coolant temperature signal to A/C auto amp. via CAN communication line.

Engine coolant temperature sensor

Engine coolant temperature sensor measures engine coolant temperature. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

Front display

Front display indicates operation status of rear automatic air conditioning system.

Heater & cooling unit assembly

Intake sensor

Intake sensor measures temperature of front evaporator fin temperature. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

Preset switch

Preset switch is integrated with front A/C control and AV operation switch. Front A/C control operation signal is transmitted from preset switch to display control unit via communication line.

Rear A/C control

The operation of the rear A/C control is communicated with the A/C auto amp. via communication line.

Rear A/C relay

Power is supplied to the rear A/C solenoid valve through rear A/C relay with A/C auto amp. control.

Rear A/C unit assembly

Rear air mix door motor

The LCU (Local Control Unit) is installed to rear air mix door motor so as to perform the multiplex communication control (LIN).

Refer to System Description ..

Rear A/C solenoid valve

Rear A/C solenoid valve operates by power supply from rear A/C relay and opens refrigerant line to rear evaporator.

Rear blower motor

Refer to Component Description ..

Rear in-vehicle sensor

Rear in-vehicle sensor measures temperature of intake air that flows through rear blower motor to passenger room. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

Rear mode door motor

The LCU (Local Control Unit) is installed to rear mode door motor so as to perform the multiplex communication control (LIN).

Refer to System Description ..

Sunload sensor

Sunload sensor measures sunload amount. This sensor is a dual system so that sunload for driver side and passenger side are measured separately. This sensor converts sunload amount to voltage signal by photodiode and transmits to A/C auto amp.

Water cut valve *1

  • Water cut valve is the electromagnetic valve that is controlled by the A/C auto amp.
  • Controls the engine coolant flow to heater core by opening and closing the valve according to a control signal from the A/C auto amp.

*1: Except for Mexico