GM Service Manual Online
For 1990-2009 cars only
(Mist):  Turn the band to mist, for a single wiping cycle. Hold it there until the wipers start, then release it. The wipers will stop after one wipe. Hold the band on mist longer if more wipe cycles are needed.

(Off):  Turns the wipers off.

(Windshield Wipers):  Turn the band to control the windshield wipers.

Turn the band to set the wiper speed for a long or short delay between wipes. The closer to the top of the lever, the shorter the delay time.

For steady wiping at low speed, turn the band away from you to the first solid band past the delay settings. For high-speed wiping, turn the band further, to the second solid band past the delay settings.

Be sure to clear ice and snow from the wiper blades before using them. If they are frozen to the windshield, gently loosen or thaw them. If they become worn or damaged, get new blades or blade inserts.