1. Faulty wiper switch: The switch that controls the wiper speed may be defective, causing the wipers to only work on high.
2. Bad wiper motor: The wiper motor itself could be faulty, preventing it from functioning properly at lower speeds.
3. Wiring issues: There may be a problem with the wiring that connects the wiper switch to the wiper motor, preventing the lower speed settings from working.
4. Faulty control module: In some cases, a faulty control module (also known as a body control module or BCM) can cause the wipers to only work on high.
To diagnose the exact cause of the issue, it's best to have a qualified mechanic inspect the wiper system and identify the specific component that is causing the problem.
