900 SE Hatchback L4-1985cc 2.0L DOHC Turbo EFI (1997)
A stepping motor requires no feedback to the ACC control module. By sending a definite number of pulses, the ACC control module always
knows how much the damper moves. A condition for this is that the control module calibrates itself by rotating the damper to an end position so
that the exact position of the damper is known.
Calibration is carried out by means of an ISAT or by simultaneously pressing the AUTO and OFF buttons. Calibration must be carried out if the
battery has been disconnected or discharged of if the ACC panel or stepping motors have been replaced. The air-blending damper is set by the
ACC control module with the aid of the blended air temperature sensor so that a suitable air temperature will be obtained.
The cabin temperature, selected temperature and outside temperature are decisive for the blended air temperature.
If the air-blending damper is set at the position for maximum cold and this is still insufficient to maintain the selected temperature, recirculation
will be selected.
If the selected temperature is HI" or "LO" the air blending damper will be set to the maximum heat or maximum cold position.