The single speed wiper motor and the single speed wiper switch are partners, likewise the two-speed wiper motor and two-speed wiper switch are partners. The two-speed wiper switch harness plug has three tabs and I believe the single speed wiper switch has a single tab. Check your switch. If it has three tabs that match the two-speed wiper switch you have, plug it in a see if it operates the existing wiper motor at low and high speed. I don't think they are interchangable.
