On most cars there is a parking circuit within the motor mechanism which returns the arms to the rest position after the inside wiper switch is turned off. so there is always some power going to the wiper motor. again on most cars the problem you describe is generally a defect in that circuit. however on some cars this circuit is in an external box attached to the wiper motor. so you need to find out if that circuit is contained within the SaaB wiper motor or is external. if there are any dealers left you could call one and ask at their service desk. if it is internal then you are going to need a new wiper motor.
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