Wipers only work on high?

Wipers only work on high, 2 weeks ago worked fine. Now only high speed works.

There is no relay for the wipers only a 25 fuse which in working order. I pulled the fuse and the wipers did not work at all. I put the fuse back in and the wipers still only worked on high on the intermittent wipers. Any other possibilities? When you say wiper switch, do you mean the whole blinker switch arm?

2002 Chevrolet Silverado, 45,000 miles, V-6 engine. When the problem began, the variable speed would work for a while, then the wipers would just stop. High speed would still work. After a while the wipers would work again. Now, the variable speed does not work at all and the wipers will not park. They only work on high. Any idea what could cause this?

Have a 98 with similar problems. It was caused by the connector plug to the drivers side wiper motor. When they go out wiggle the connector plug to see if they come back on. I ended up having connector plug replaced.

There is a windshield wiper module within the motor. It is a simple allen wrench repair. There are three small allens and the board comes out with the female plug end attached. Slide the new one in and you are done.

Thanks for your replies. Apparently on my 2002 Silverado, the control board is built into the plastic cover. When I removed the cover I saw no way to remove the board. I just today replaced the entire motor assembly, I got the whole thing on EBAY for the price of the cover alone. I am happy to say I have all speeds working now and all seems well. Sadly, as I was doing the work, I remembered I need a tune up, and can't even see the distributor cap, looks like major surgery just to replace the cap, don't ya just love these new vehicles. Thanks again, I really like this forum.