My windshield wipers only work on low.
The wiper high setting is controlled through the wiper switch to "ask" the GEM module to turn on the wiper high relay. The most common problem is the wiper switch, but before the switch is condemned, it can be tested to see if it is giving the correct signal to the GEM module by testing it, and the relay, for problems. I recommend that you have a mechanic, like the ones from YourMechanic, come by and inspect your wipers for you.
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