Nissan Murano Z51. Manual - part 843

MODE DOOR CONTROL SYSTEM

HAC-27

< SYSTEM DESCRIPTION >

[WITHOUT 7 INCH DISPLAY]

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MODE DOOR CONTROL SYSTEM

System Diagram

INFOID:0000000005514582

System Description

INFOID:0000000005514583

The mode door is automatically controlled by the temperature setting, ambient temperature, in-vehicle temper-
ature, intake temperature and amount of sunload.

SYSTEM OPERATION

• The A/C auto amp. receives data from each of the sensors.
• The A/C auto amp. sends the air mix door, the mode door, the upper ventilator door and the intake door

opening angle data to the air mix door motor LCU(s), the mode door motor LCU, the upper ventilator door
motor LCU and the intake door motor LCU.

• The air mix door motor(s), the mode door motor, the upper ventilator door motor and the intake door motor

read their respective signals according to the address signal. Opening angle indication signals received from
the A/C auto amp. and each of the motor position sensors are compared by the LCUs in each door motor
with the existing decision and opening angles.

• Next, HOT/COLD, DEF/VENT, OPEN/SHUT or FRE/REC operations is selected. The newly selected data is

returned to the A/C auto amp.

Door Motor Circuit

Mode Door Control Specification

JMIIA0491GB

JPIIA0495GB

HAC-28

< SYSTEM DESCRIPTION >

[WITHOUT 7 INCH DISPLAY]

MODE DOOR CONTROL SYSTEM

Mode position can be selected manually by pressing the MODE
switch or the DEF switch on the A/C control. This enables to fix a
mode position. Pressing the AUTO switch allows automatic control
by the A/C auto amp. During the automatic control of a mode posi-
tion, a mode door position (VENT, B/L, FOOT, or D/F) is selected
based on a target the air mix door opening angle and sunload
depending on the temperature calculated by the A/C auto amp. In
addition, the D/F is selected to prevent windshield fogging only when
ambient temperature is extremely low with mode position the FOOT.

JPIIA0767GB

UPPER VENTILATOR DOOR CONTROL SYSTEM

HAC-29

< SYSTEM DESCRIPTION >

[WITHOUT 7 INCH DISPLAY]

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UPPER VENTILATOR DOOR CONTROL SYSTEM

System Diagram

INFOID:0000000005514584

System Description

INFOID:0000000005514585

The upper ventilator door motor is attached to the heater & cooling unit assembly. The upper ventilator door
motor operates by the UPPER VENT switch ON/OFF. Motor rotation is conveyed to a rod which activates the
upper ventilator door.

SYSTEM OPERATION

• The A/C auto amp. receives data from each of the sensors.
• The A/C auto amp. sends air mix door, the mode door, the upper ventilator door and the intake door opening

angle data to the air mix door motor LCU(s), the mode door motor LCU, the upper ventilator door motor LCU
and the intake door motor LCU.

• The air mix door motor(s), the mode door motor, the upper ventilator door motor and the intake door motor

read their respective signals according to the address signal. Opening angle indication signals received from
the A/C auto amp. and each of the motor position sensors are compared by the LCUs in each door motor
with the existing decision and opening angles.

• Next, HOT/COLD, DEF/VENT, OPEN/SHUT or FRE/REC operations is selected. The newly selected data is

returned to the A/C auto amp.

Door Motor Circuit

Upper Ventilator Specification

JPIIA0496GB

JPIIA0495GB

HAC-30

< SYSTEM DESCRIPTION >

[WITHOUT 7 INCH DISPLAY]

UPPER VENTILATOR DOOR CONTROL SYSTEM

UPPER VENT switch

MODE position

Upper ventilator door position

OFF

—

Close

ON

VENT or B/L

Open (Fully-open)

ON

FOOT or D/F

Open (Intermediate)

ON

DEF

Close