Abstract: An automotive windshield wiper system with adjustable wiping pressure includes a drive shaft, a head rigidly mounted to the drive shaft for unitary rotation therewith, a wiper arm pivotally connected to the head at a first end and retaining a wiper blade at a second end, and a spring between the head and the wiper arm inducing a force pivoting the wiper arm toward an associated wiping surface. A controller is disposed between the spring and the head and relies exclusively on the relative rotation between the wiper arm and the vehicle body as a source of all motive power to selectively displace an end of the spring and thereby vary the force on the wiper arm.