Infiniti M45 (Y34). Manual — part 135
AIR CONDITIONER CONTROL
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AIR CONDITIONER CONTROL
PFP:27500
Description of Air Conditioner LAN Control System
AJS00079
The LAN (Local Area Network) system consists of auto amp., mode door motor, air mix door motor and intake
door motor.
A configuration of these components is shown in the diagram below.
System Construction
AJS0007A
A small network is constructed between the auto amp., air mix door motor, mode door motor and intake door
motor. The 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 motors.
Addresses, motor opening angle signals, motor stop signals and error checking messages are all transmitted
through the data transmission lines connecting the auto amp. and two motors.
The following functions are contained in LCUs built into the air mix door motor, the mode door motor and the
intake door motor.
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Address
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Motor opening angle signals
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Data transmission
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Motor stop and drive decision
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Opening angle sensor (PBR function)
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Comparison
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Decision (Auto amp. indicated value and motor opening angle comparison)
RHA439GC
RJIA0200E
ATC-26
AIR CONDITIONER CONTROL
OPERATION
The auto amp. receives data from each of the sensors. The amp. sends mode door, air mix door and intake
door opening angle data to the mode door motor LCU, air mix door motor LCU and intake door motor LCU.
The mode door motor, air mix door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the auto amp. and each of the motor position
sensors is compared by the LCUs in each motor with the existing decision and opening angles. Subsequently,
HOT/COLD, DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is
returned to the auto amp.
TRANSMISSION DATA AND TRANSMISSION ORDER
Auto amp. 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 amp. is selected according to data-based decisions made by the air mix door motor,
mode door motor and 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 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 symptoms.
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Malfunction electrical frequency
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Poor electrical connections
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Signal leakage from transmission lines
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Signal level fluctuation
RJIA0201E
AIR CONDITIONER CONTROL
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Stop Signal:
At the end of each transmission, a stop operation, in-operation, or internal problem message is delivered to
the auto amp. This completes one data transmission and control cycle.
AIR MIX DOOR CONTROL (AUTOMATIC TEMPERATURE CONTROL)
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.
FAN SPEED CONTROL
Blower speed is automatically controlled by the temperature setting, ambient temperature, in-vehicle tempera-
ture, 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
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.
OUTLET DOOR CONTROL
The outlet door is automatically controlled by the temperature setting, ambient temperature, in-vehicle temper-
ature, intake temperature and amount of sunload.
RJIA0202E
ATC-28
AIR CONDITIONER CONTROL
MAGNET CLUTCH CONTROL
The ECM controls compressor operation using input signals from the refrigerant pressure sensor, throttle posi-
tion sensor and auto amp.
SELF-DIAGNOSTIC SYSTEM
The self-diagnostic system is built into the auto amp. to quickly locate the cause of symptoms.
RJIA1262E
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