Nissan Murano: Heater & Air Conditioning Control System :: System Description / Operation

Nissan Murano (Z52) 2015-2024 Service Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning Control System :: System Description / Operation

Switch Name and Function

Controller (A/C switch assembly)

1. AUTO switch 2. Temperature control dial (driver side) 3. Defroster switch
4. Fan switch 5. A/C switch 6. Recirculation switch
7. Fresh air switch 8. Temperature control dial (passenger side) 9. DUAL switch
10. MODE switch 11. Display 12. ON·OFF switch

Switch Operation

AUTO switch

Turns the switch indicator lamp and “AUTO” indicator on the display ON and then front air conditioning system becomes the following state:

  • Air inlet: Automatic control

  • Air outlet: Automatic control

  • Blower fan: Automatic control

  • A/C compressor: ON

Defroster switch

Turns defroster mode (switch indicator) between ON ⇔ OFF each time.

When defroster switch is pressed while front air conditioning system is in the ON position.

  • When defroster mode is turned ON, front air conditioning system becomes the following state:

    • Air inlet: Fresh air intake

    • Air outlet: DEF

    • Blower fan: Automatic control (If fan speed other than AUTO is selected before pressing defroster switch, fan speed is manual control.)

    • A/C compressor: ON

  • When defroster mode is turned OFF, front air conditioning system state returns to the previous state before defroster mode is selected. But, the following state is continued:

    • Air inlet: Fresh air intake

    • A/C compressor: ON

When defroster switch is pressed while front air conditioning system is in the OFF position.

  • When defroster mode is turned ON, front air conditioning system becomes the following state:

    • Air inlet: Fresh air intake

    • Air outlet: Defroster

    • Blower fan: Automatic control

    • Compressor: ON

  • When defroster mode is turned OFF, entire front air conditioning system is set to auto mode.

NOTE:

When defroster mode turns ON while front air conditioning system is in automatic control (“AUTO” is indicated), automatic control is released (“AUTO” turns OFF).

DUAL switch
  • Turns left and right ventilation temperature control (switch indicator) between ON ⇔ OFF each time.

  • When DUAL switch indicator is ON, the driver side and passenger side temperatures can each be set independently.

  • When DUAL switch indicator is OFF, the driver side outlet and setting temperature is applied to both sides.

  • Left and right ventilation temperature control is cancelled by turning the DEF mode ON.

NOTE:

When front air conditioning system is in the OFF position, left and right ventilation temperature control can be selected only while front air conditioning system state (when MODE switch is pressed) is indicated on the display.

Fan switch (UP/DOWN)

Blower fan speed is manually controlled with these switches. Seven speeds are available for manual control (as shown on the display screen).

NOTE:

  • When fan switch is pressed while front air conditioning system is in OFF, front air conditioning system is activated. (Compressor control state returns to the previous state before front air conditioning system OFF.)

  • When fan switch is pressed while front air conditioning system is in automatic control (“AUTO” is indicated), automatic control is released (“AUTO” turns OFF).

A/C switch

Compressor control (switch indicator) changes between ON ⇔ OFF each time this switch is pressed while front blower motor is operated.

NOTE:

  • A/C switch cannot be turned ON when front blower motor is OFF.

  • A/C switch cannot be turned OFF when air outlet is D/F or DEF.

  • Air inlet changes to fresh air intake when A/C switch is turned OFF while air inlet is set to recirculation.

MODE switch

Selects air outlet sequentially from VENT ⇒ B/L ⇒ FOOT ⇒ D/F ⇒ VENT each time.

NOTE:

  • When front air conditioning system is in the OFF position, air outlet can be selected.

  • When MODE switch is pressed while front air conditioning system is in automatic control (“AUTO” is indicated), automatic control is released (“AUTO” turns OFF).

ON·OFF switch
  • Turns front air conditioning system ON·OFF.

  • When front air conditioning system turns OFF:

    • air outlet becomes automatic control.

    • air inlet is set to recirculation.

Fresh air switch

Air inlet changes to fresh air (FRE) when this switch is pressed:

  • Fresh air switch indicator ON: Fresh air intake

  • Fresh air switch indicator OFF: Recirculation

NOTE:

When front air conditioning system is in the OFF position, air inlet can be selected.

Recirculation switch

Air inlet changes to recirculation (REC) when this switch is pressed:

  • Recirculation switch indicator ON: Recirculation

  • Recirculation switch indicator OFF: Fresh air intake

NOTE:

  • When front air conditioning system is in the OFF position, air inlet can be selected.

  • When MODE switch and DEF switch is in the DEF position, air inlet cannot be selected to recirculation (REC).

  • When MODE switch and DEF switch is in the D/F position, air inlet can be selected to recirculation (REC).

Temperature control dial (Driver side)

Setting temperature is selected using this dial within a range between 60°F or 61°F (18°C) and 89°F or 90°F (32°C) at a rate of 1.0°F (0.5°C) per adjustment.

NOTE:

When air conditioning system is OFF, setting temperature can be selected only while air conditioning system status screen [only when MODE switch (driver side) is pressed] is indicated on display.

Temperature control dial (Passenger side)
  • Outlet air flow temperature of passenger side can be changed without changing outlet air flow temperature of driver side.

  • Setting temperature is selected using this dial within a range between 60°F or 61°F (18°C) and 89°F or 90°F (32°C) at a rate of 1.0°F (0.5°C) per adjustment.

NOTE:

  • When air conditioning system is OFF, setting temperature can be selected only while air conditioning system status screen [only when MODE switch (passenger side) is pressed] is indicated on display.

  • When DEF mode is ON, temperature control dial (passenger side) is inoperative.

    System

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    Diagnosis System (hvac)

    Description Air conditioning system performs self-diagnosis, operation check, function diagnosis, and various settings using diagnosis function of each control unit...

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