Infiniti I35 (A33). Manual — part 527
RHA351H
Transmission Data and Transmission Order
NHHA0168S0102
Amplifier data is transmitted consecutively to each of the door motors following the form shown in figure below.
Start: Initial compulsory signal sent to each of the door motors.
Address: Data sent from the auto amplifier is selected according to data-based decisions made by the air mix
door motor, intake door motor and mode 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 is normal, door control
begins.
If an error exists, the received data is rejected and 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: Procedure by which sent and received data is checked for errors. Error data is then compiled.
The error check prevents corrupted data from being used by the air mix door motor, mode door motor and
intake door motor. Error data can be related to the following problems.
I
Abnormal electrical frequency
I
Poor electrical connections
I
Signal leakage from transmission lines
I
Signal level fluctuation
Stop signal: At the end of each transmission, a stop operation, in-operation, or internal problem message is
delivered to the auto amplifier. This completes one data transmission and control cycle.
RHA352H
Air Mix Door Control (Automatic Temperature Control)
NHHA0168S0103
The air mix door is automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by: The temperature setting, ambient temperature, in-vehicle temperature and amount of sunload.
GI
MA
EM
LC
EC
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AT
AX
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BR
ST
RS
BT
SC
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IDX
DESCRIPTION
Features (Cont’d)
HA-21
Fan Speed Control
NHHA0168S0104
Blower speed is automatically controlled based on temperature setting, ambient temperature, in-vehicle
temperature, intake temperature, amount of sunload and air mix door position.
With FAN switch set to “AUTO”, the blower motor starts to gradually increase air flow volume.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.
Intake Door Control
NHHA0168S0105
The intake doors are automatically controlled based on temperature setting, ambient temperature, in-vehicle
temperature, intake temperature, amount of sunload, air mix door position and ON-OFF operation of the com-
pressor.
Outlet Door Control
NHHA0168S0106
The outlet door is automatically controlled by: The temperature setting, ambient temperature, in-vehicle
temperature, intake temperature and amount of sunload.
Magnet Clutch Control
NHHA0168S0107
The ECM controls compressor operation using input signals from the throttle position sensor, refrigerant pres-
sure sensor and auto amplifier.
Self-diagnostic System
NHHA0168S0108
The self-diagnostic system is built into the auto amplifier (LCU) to quickly locate the cause of problems.
DESCRIPTION
Features (Cont’d)
HA-22
Overview of Control System
=NHHA0169
The control system consists of input sensors, switches, the automatic amplifier (microcomputer) and outputs.
The relationship of these components is shown in the diagram below:
RHA032IA
Control Operation
NHHA0170
RHA033IA
GI
MA
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LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
SC
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IDX
DESCRIPTION
Overview of Control System
HA-23
DISPLAY SCREEN
NHHA0170S01
Displays the operational status of the system.
AUTO SWITCH
NHHA0170S02
The compressor, intake doors, air mix door, outlet doors, and blower speed are automatically controlled so
that the in-vehicle temperature will reach, and be maintained at the set temperature selected by the operator.
ECON SWITCH
NHHA0170S03
By pressing the ECON switch, the display should indicate ECON and the compressor always turns OFF. With
the compressor OFF, the system will not remove heat (cool) or de-humidify. The system will maintain the in-
vehicle temperature at the set temperature when the set temperature is above the ambient (outside) tempera-
ture. The system will set the intake doors to the outside air position.
TEMPERATURE DIAL (POTENTIO TEMPERATURE CONTROL)
NHHA0170S04
Increases or decreases the set temperature.
OFF SWITCH
NHHA0170S05
The compressor and blower are OFF, the intake doors are set to the outside air position, and the air outlet
doors are set to the foot (80% foot and 20% defrost) position.
FAN SWITCH
NHHA0170S06
Manual control of the blower speed. Four speeds are available for manual control (as shown on the display
screen):
low
, medium low
, medium high
, high
RECIRCULATION (REC) SWITCH
NHHA0170S07
OFF position: Outside air is drawn into the passenger compartment.
ON position: Interior air is recirculated inside the vehicle.
DEFROSTER (DEF) SWITCH
NHHA0170S08
Positions the air outlet doors to the defrost position. Also positions the intake doors to the outside air position.
MODE SWITCH
NHHA0170S09
Control the air discharge outlets.
REAR WINDOW DEFOGGER SWITCH
NHHA0170S10
When illumination is ON, rear window is defogged.
DESCRIPTION
Control Operation (Cont’d)
HA-24
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