9-3 (9440) V6-2.8L Turbo (2008)
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Main task
The stepping motor is connected via a linkage to damper for the floor vent, which is used for both climate zones.
Type
The unipolar stepping motor consists of a rotor (10 poles) and four stator windings. A gearbox transfers the power from the rotor to the lever which
controls the damper.
Connect
The four stepping motor windings receive a common B+ feed from ACC unit pin 32 (K32).
The ACC unit grounds each winding (pin 10, 27, 11 and 12 in K32) in a specific order thus operating the motor in short pulses, which explains the name
stepping motor. The rotational direction can be changed.
