Nissan Maxima. Manual - part 736

HAC-120

< SYSTEM DESCRIPTION >

[WITH MONOCHROME DISPLAY]

MODE DOOR CONTROL SYSTEM

Mode position can be selected manually by pressing the MODE

switch or the DEF switch on the A/C switch assembly. Pressing the

AUTO switch allows automatic control by the A/C auto amp. During

the automatic control of a mode position, a mode door position

(VENT, B/L, FOOT, or D/F) is selected based on a target air mix door

opening angle and the sunload sensor, 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.

AWIIA1183GB

AIR MIX DOOR CONTROL SYSTEM

HAC-121

< SYSTEM DESCRIPTION >

[WITH MONOCHROME DISPLAY]

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AIR MIX DOOR CONTROL SYSTEM

System Diagram

INFOID:0000000010051117

System Description

INFOID:0000000010051118

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 and the intake door opening angle data to the air mix

door motor LCU(s), the mode door motor LCU and the intake door motor LCU.

• The air mix door motor(s), the mode 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 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

AWIIA1122GB

AWIIA1066GB

HAC-122

< SYSTEM DESCRIPTION >

[WITH MONOCHROME DISPLAY]

AIR MIX DOOR CONTROL SYSTEM

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 the air mix door, according to the target air mix

door opening angle and the current air mix door opening angle,

keeping an optimum air mix door opening angle. When the tempera-

ture is set at 18

°C (60°F), air mix door is set on full-cold, and when

the temperature is set at 32

°C (90°F), it is set to full-hot.

JPIIA0633GB

INTAKE DOOR CONTROL SYSTEM

HAC-123

< SYSTEM DESCRIPTION >

[WITH MONOCHROME DISPLAY]

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INTAKE DOOR CONTROL SYSTEM

System Diagram

INFOID:0000000010051119

System Description

INFOID:0000000010051120

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 A/C 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 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

AWIIA1123GB

AWIIA1066GB