Quote:
Originally Posted by Joeypete
Yes love new toys! This one needs so much little stuff done to it...seems like everything that is electrical has some kind of malfunction. The wipers wouldn't turn off yesterday...did eventually but I had to keep changing speeds until it finally stopped. Think it needs a new turn signal lever.
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Hmmm.... Brake booster, HVAC, now the wipers.
The GM two speed wiper motors use a unique wiring scheme. There is a primary motor winding that provides the high speed. There is a reverse-wound shunt winding that is energized at the same time as the primary winding at the low speed setting. The shunt winding partly negates the magnetic field from the primary winding, slowing the motor down. The shunt winding is also used to park the wiper arms when you shut it off. Frequently either the internal contacts or the wiring for the shunt goes bad, resulting in the inability to turn it off (or worse, the 3" up-down motion of the wiper arms). Could be the motor, the switch, or the wires in between.