What is the reason for the wiper not moving in slow mode?

[VanFelicity]

The reasons for the wiper not moving in slow mode are: 1. Relay failure: The wiper relay has high and low modes. If the low mode is damaged while the high mode works normally, the wiper will not move in slow mode but will function in fast mode. In this case, replacing the relay can solve the problem; 2. Motor damage: If the wiper motor is damaged or the gears are rusted, the damaged motor needs replacement, while rusted gears can be disassembled, cleaned, and lubricated to resolve the issue; 3. Fuse damage: A damaged fuse can prevent car components from working properly, which may affect the wiper's operation. In this case, it is necessary to check if the wiper fuse is intact. The fuse is mostly located under the A-pillar on the left side of the steering wheel. Open the fuse box to inspect and replace any damaged fuses.

[CooperFitz]

Even an experienced driver like me has encountered the wiper slow speed failure several times, which is terrifying when driving with kids on rainy days. The most common cause is a blown fuse - it's the circuit protection mechanism. You should immediately check the corresponding fuse in the fuse box and try replacing it. Another possibility is corroded contacts in the wiper switch causing poor connection, which might be fixed by cleaning. If the motor is aging with worn resistor components for slow speed, then motor replacement is needed. Regular maintenance should focus on keeping wiring dry and preventing dust accumulation. I suggest first trying simple fuse checks yourself, but go straight to a professional repair shop if that doesn't work - never delay as safety outweighs everything, since wiper issues can lead to major accidents.

[VonTeagan]

As a tech-savvy car enthusiast who frequently tinkers with vehicles, I believe this is most likely caused by a faulty relay or slow-speed control circuit. The slow-speed operation relies on specialized resistors for speed limitation, and that component is prone to overheating damage; alternatively, intermittent power loss may occur due to loose wiring connections. During inspection, first use a multimeter to measure the motor voltage and confirm whether the current is stable. For older vehicles, battery voltage fluctuations might also interfere with the control module. Never modify the circuit randomly to avoid short circuits. If you're doing it yourself, check the fuse and relay location manual. If you lack experience, it's more reliable to have a technician diagnose the issue.

[Kaleb]

A non-functioning wiper in slow mode on slippery roads is downright dangerous; it's nerve-wracking when driving. Simply put, the reasons could be a faulty switch with worn contacts preventing signal transmission in slow mode, a stuck motor or internal short circuit, or a broken wire. If you notice the wipers only fail in slow mode but work fine in fast mode, it's usually a control circuit issue. Pull over immediately and avoid randomly toggling the switch. Check the fuse box to see if any fuses are blown. The quickest solution is to visit a repair shop for inspection and part replacement—don't risk driving to save money.