9-3 FWD (9440) L4-2.0L Turbo (B207R) (2009)
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When the stepping motor is stationary, two windings are continuously grounded in order to lock the motor. The stepping motor does not need to be
reconnected to the control module (position sensor). By sending a specific number of ground pulses, the ACC unit knows how far the air distribution
damper has moved.
