Owner's Manual

AIR CONDITIONER CONTROL
MTC-21
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MTC
Revision: March 2005 2005 Altima
AIR CONDITIONER CONTROL PFP:27500
Overview Air Conditioner LAN Control System EJS002S5
The LAN (local area network) system consists of front air control, air mix door motor, intake door motor, and
mode door motor.
A configuration of these components is shown in the diagram below.
System Construction EJS002S6
A small network is constructed between the front air control, air mix door motor, intake door motor, and mode
door motor. The front air control and motors are connected by data transmission lines and motor power supply
lines. The LAN network is built through the ground circuits of the two motors.
Addresses, motor opening angle signals, motor stop signals and error checking messages are all transmitted
through the data transmission lines connecting the front air control and each motor.
The following functions are contained in LCUs built into the air mix door motor, intake door motor, and the
mode door motor.
● Address
● Motor opening angle signals
● Data transmission
● Motor stop and drive decision
● Opening angle sensor (PBR function)
● Comparison
● Decision (front air control indicated value and motor opening angle comparison)
OPERATION
The front air control receives signals from its various dials and switches. The front air control then sends air
mix door, mode door and intake door opening angle data to the air mix door motor LCU, mode door motor LCU
and intake door motor LCU.
The air mix door motor, mode door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the front air control and each of the motor posi-
tion sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subse-
WJIA0876E
WJIA0877E