Why do windshield wipers on 1994 Pontiac transport work on high speed but not on low speed?

If the windshield wipers on a 1994 Pontiac Transport work on high speed but not on low speed, it could be due to a faulty wiper motor or a problem with the wiper relay or switch. The low-speed setting may rely on different electrical contacts or circuits than the high-speed setting, which could be malfunctioning. Additionally, worn-out components like the wiper linkage or a clogged motor could contribute to this issue. It's advisable to have the electrical system and wiper assembly inspected for a proper diagnosis.