Nissan Teana J32. Manual - part 689

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-125

< FUNCTION DIAGNOSIS >

[WITH 7 INCH DISPLAY]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

DISCHARGE AIR FLOW

JPIIA0884GB

HAC-126

< FUNCTION DIAGNOSIS >

[WITH 7 INCH DISPLAY]

AUTOMATIC AIR CONDITIONER SYSTEM

AIR DISTRIBUTION

SWITCHES AND THEIR CONTROL FUNCTION

JPIIA0877GB

JPIIA0885GB

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-127

< FUNCTION DIAGNOSIS >

[WITH 7 INCH DISPLAY]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

AIR CONDITIONER LAN CONTROL SYSTEM

The LAN (Local Area Network) system consists of the A/C auto amp., the mode door motor, the air mix door
motors and the intake door motor.
A configuration of these components is as shown in the figure below.

SYSTEM CONSTRUCTION

A small network exists between the A/C auto amp., the mode door motor, the air mix door motor and the intake
door motor. The A/C auto amp. and motors are connected by data transmission lines and motor power supply
lines. The LAN network is built through the ground circuits of each door motor.
Addresses, motor opening angle signals, motor stop signals and error checking messages are all transmitted
through the data transmission lines connecting the A/C auto amp. and each door motor.
The following functions are contained in LCUs built into the mode door motor, the air mix door motors and the
intake door motor.
• Address
• Motor opening angle signals
• Data transmission
• Motor stop and drive decision
• Opening angle sensor (PBR function)
• Comparison

JSIIA1189GB

JSIIA1129GB

HAC-128

< FUNCTION DIAGNOSIS >

[WITH 7 INCH DISPLAY]

AUTOMATIC AIR CONDITIONER SYSTEM

• Decision (A/C auto amp. indicated value and motor opening angle comparison)

Operation

The A/C auto amp. receives data from each of the sensors. The A/C auto amp. sends mode door, the air mix
door and the intake door opening angle data to the mode door motor LCU, the air mix door motor LCUs and
the intake door motor LCU.
The mode door motor, the air mix door motors and the intake door motor read their respective signals accord-
ing to the address signal. Opening angle indication signals received from the A/C auto amp. and each of the
motor position sensors is 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 new selection
data is returned to the A/C auto amp.

Transmission Data and Transmission Order

A/C auto amp. data is transmitted consecutively to each of the door motors following the form as shown in the
figure below.

START:

• Initial compulsory signal is sent to each of the door motors.

ADDRESS:

• Data sent from the A/C auto amp. is selected according to data-based decisions made by the mode door

motor, the air mix door motors and the intake door motor.

• If the addresses are identical, the opening angle data and error check signals are received by the door motor

LCUs. The LCUs then make the appropriate error decision. If the opening angle data has no error, door con-
trol begins.

• If an error exists, the received data is rejected and the corrected data received. Finally, door control is based

upon the corrected opening angle data.

OPENING ANGLE:

• Data that shows the indicated door opening angle of each door motor.

ERROR CHECK:

• In this procedure, transmitted and received data is checked for errors. Error data is then compiled. The error

check prevents corrupted data from being used by the mode door motor, the air mix door motors and the
intake door motor. Error data can be related to the following symptoms.

- Malfunction of electrical frequency
- Poor electrical connections
- Signal leakage from transmission lines
- Signal level fluctuation

STOP SIGNAL:

JSIIA1130GB

JSIIA1131GB