System Operation
The front air control receives data from each of the sensors. The front air control 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 position sensors are compared by the LCU's in each motor with the existing decision and opening angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the front air control.
Mode Door Control Specification
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor (1) is attached to the heater and cooling unit assembly. It rotates so that air is discharged from the outlet set by the front air control. Motor rotation is conveyed to a link which activates the mode door.
NOTE:
Confirm that the A/C compressor clutch is engaged (visual Inspection and intake door position is at (FRESH) when (DEF) or (D/F) is selected.
Can a symptom be duplicated?
YES >> GO TO 3
NO >> GO TO 2