Nissan Quest E52. Manual - part 759

HAC-166

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

SYSTEM

FRONT MANUAL AIR CONDITIONING SYSTEM : Circuit Diagram

INFOID:0000000009652630

REAR MANUAL AIR CONDITIONING SYSTEM

JMIIA1865GB

SYSTEM

HAC-167

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

REAR MANUAL AIR CONDITIONING SYSTEM : System Description

INFOID:0000000009652631

SYSTEM DIAGRAM

DESCRIPTION

• Rear manual air conditioning system is controlled by each function of A/C amp.
• Each operation of rear manual air conditioning can be controlled by front A/C control (built-in A/C amp.) and

rear A/C control.

CONTROL BY A/C AMP.

•

HAC-167, "REAR MANUAL AIR CONDITIONING SYSTEM : Air Flow Control"

•

HAC-168, "REAR MANUAL AIR CONDITIONING SYSTEM : Door Control"

REAR MANUAL AIR CONDITIONING SYSTEM : Air Flow Control

INFOID:0000000009652632

DESCRIPTION

• A/C amp. changes duty ratio of rear blower motor control signal to control air flow continuously. When air

flow is increased, duty ratio of rear blower motor control signal gradually increases to prevent a sudden
increase in air flow.

• In addition to manual control, air flow control is compose of fan speed control at door motor operation.

FAN SPEED CONTROL AT DOOR MOTOR OPERATION

When rear mode door motor is activated while air flow is more than the specified value, A/C amp. reduces
temporarily fan speed so that rear mode door moves smoothly.

JMIIA1790GB

HAC-168

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

SYSTEM

REAR MANUAL AIR CONDITIONING SYSTEM : Door Control

INFOID:0000000009652633

DOOR MOTOR CONTROL

• LCU (Local Control Unit) is built into each door motor. And detects door position by PBR (Potentio Balance

Resistor). 

• A/C amp. communicates with each LCU via communication line. And receives each door position feedback

signal from each LCU.

• Each LCU controls each door to the appropriate position depending on the control signal from A/C amp. 
• Each LCU transmits the signal of door movement completion to A/C amp., when the door movement is com-

pleted.

SWITCHES AND THEIR CONTROL FUNCTION

JMIIA1868GB

1.

Rear blower motor

2.

Rear evaporator

3.

Rear air mix door

4.

Rear heater core

5.

Rear mode door

Recirculation air

Discharge air

Rear ventilator

Rear foot

JMIIA1008ZZ

SYSTEM

HAC-169

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

AIR DISTRIBUTION

REAR MANUAL AIR CONDITIONING SYSTEM : Circuit Diagram

INFOID:0000000009652634

Switch position

Door position

Rear mode door

Rear air mix door

MODE switch

C

—

D

E

Temperature control switch (front A/C control) or temperature 

control switch (rear A/C control)

Full cold

—

A

Full hot

B

ON·OFF switch (front A/C control)

OFF

E

—

OFF switch (rear A/C control)

Discharge air flow

Mode position

Air outlet/distribution

Rear ventilator

Rear foot

100%

—

62%

38%

—

100%

JMIIA1866GB