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HAC-18 < FUNCTION DIAGNOSIS > [AUTOMATIC AIR CONDITIONER] AUTOMATIC AIR CONDITIONER SYSTEM The front air control receives data from each of the sensors. The front air control sends mode door, air mix doors and intake door opening angle data to the mode door motor LCU, air mix door motors LCUs and intake door motor LCU. The mode door motor, air mix door motors 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 is compared by the LCUs in each door motor with the existing decision and opening angles. Sub- sequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection data is returned to the front air control. Transmission Data and Transmission Order Front air control data is transmitted consecutively to each of the doors motor following the form shown in figure below. START: • Initial compulsory signal is sent to each of the door motors. ADDRESS: • Data sent from the front air control are selected according to data-based decisions made by the mode door motor, air mix door motors 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 have no error, door control begins. • If an error exists, the received data are 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: • In this procedure, transmitted and received data is checked for errors. Error data are 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: AWIIA0051GB |