Nissan Murano. Manual - part 846

HAC-158

< SYSTEM DESCRIPTION >

[WITH 7 INCH DISPLAY]

AIR MIX DOOR CONTROL SYSTEM

AIR MIX DOOR CONTROL SYSTEM

System Diagram

INFOID:0000000009722146

System Description

INFOID:0000000009722147

The air mix doors are automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by the temperature setting, ambient temperature, 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 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 operation is selected. The newly selected data is

returned to the A/C auto amp.

Door Motor Circuit

Air Mix Door Control Specification

JSIIA1545GB

JPIIA0495GB

AIR MIX DOOR CONTROL SYSTEM

HAC-159

< SYSTEM DESCRIPTION >

[WITH 7 INCH DISPLAY]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

When ignition switch is ON, the A/C auto amp. continuously and
automatically controls temperatures regardless of air conditioner
operational condition. When setting a target temperature with the
temperature control switch, the A/C auto amp. corrects the set tem-
perature and decides a target air mix door opening angle. The A/C
auto amp. controls air mix door according to the target air mix door
opening angle and current air mix door opening angle, keeping an
optimum air mix door opening angle. When the temperature is set at
18

°

C (60

°

F), air mix door is set on full cold, and when the tempera-

ture is set at 32

°

C (90

°

F), it is set to full hot.

JPIIA0633GB

HAC-160

< SYSTEM DESCRIPTION >

[WITH 7 INCH DISPLAY]

INTAKE DOOR CONTROL SYSTEM

INTAKE DOOR CONTROL SYSTEM

System Diagram

INFOID:0000000009722148

System Description

INFOID:0000000009722149

The intake doors are automatically controlled by the temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature, amount of sunload and ON/OFF operation of the compressor.

SYSTEM OPERATION

The intake door control judges intake door position based on the ambient temperature, the intake air tempera-
ture and the in-vehicle temperature. When in shifting mode position D/F, if the DEF or ON/OFF switches are
pressed, or when the A/C switch is OFF, the A/C auto amp. sets the intake door to the FRE position.

Door Motor Circuit

Intake Door Control Specification

JSIIA1546GB

JPIIA0495GB

INTAKE DOOR CONTROL SYSTEM

HAC-161

< SYSTEM DESCRIPTION >

[WITH 7 INCH DISPLAY]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Intake door position is basically set to the FRE when the FRE indica-
tor of the DEF switch and the intake switch turn ON, and set on the
REC when the REC indicator of intake switch turns ON.
The intake door automatic control selects the FRE, the 20%FRE, or
the REC depending on the target air mix door opening angle, based
on in-vehicle temperature, ambient temperature, and sunload.

JPIIA0634GB