Why can the car window roll up but not down?

[OscarMarie]

Possible reasons for the malfunction of the Sagitar window glass button and the window not rolling down are as follows: 1. Lack of lubrication: The main reason for the electric window switch not operating smoothly is often the depletion of lubricant inside the door's lift mechanism. The inner cover should be removed and lubricant added. 2. Switch failure: If the glass cannot move at all, it may be due to a switch failure. If the switch is faulty, it can only be replaced. If the switch's operation deteriorates and the window cannot open smoothly, the likelihood of a switch failure is high. 3. Fuse damage: If electronic devices are not functioning, checking the fuse is a general rule. Carefully inspect whether the fuse for the electric window is damaged.

[McBryce]

I had a similar issue with my old Ford before—the window could roll up smoothly but just wouldn’t go down, which was really annoying. This was mainly because the contacts on the down switch were rusted or the wiring connections were loose, preventing the signal from reaching the motor. Another possible cause was the gears in the window regulator getting stuck in the down position, affecting only that movement. Back then, I tried taking off the door panel to check it myself but ended up making things worse and nearly ripped some wires. My advice is to avoid repeatedly operating the switch to prevent blowing a fuse—they’re cheap but losing power is a hassle. If possible, try replacing the fuse from the fuse box first. If that doesn’t work, have a mechanic quickly test it with a multimeter. For prevention, I make it a habit to clean the window tracks and spray lubricant every six months, which reduced the problem by 80%—now it’s quiet and worry-free. Bottom line: fix it early if it happens; don’t delay.

[LolaRose]

My new car is only two years old, but suddenly the driver's side window can only go down and not up, which was super embarrassing when I had to pay for parking. From what I've researched, this issue often stems from faults in the electronic control components, such as worn micro switches under the down button or a blown relay. The motor itself is fine, but the commands aren't getting through. Modern cars have complex wiring, so it could also be a loose connector or worn wiring at the door hinge interrupting the signal. I saw similar cases on car forums and tried lightly tapping the door panel, which sometimes provides temporary relief, but it's not a permanent fix. Nowadays, we rely on diagnostic tools, so I recommend getting regular maintenance and having the window system checked, especially to prevent moisture from corroding the circuits. The repair isn't expensive, but it affects convenience, so get it fixed quickly.

[AryaRose]

The repair shop has handled many such cases where customers report windows won't roll down but roll up smoothly. Common root causes include burnt contacts in the relay or switch assembly controlling the lowering function, interrupting the signal; sometimes it's wiring harness aging and breaking at the door seam. A simple diagnostic method is listening for a 'click' sound when operating the switch—if present, it indicates the switch works but current isn't passing; no sound means the switch is faulty. If the motor hums but doesn't move during operation, the guide rail might be blocked or jammed. DIY repairs carry risks, like damaging interior trim—better bring the car in for our professional equipment to pinpoint the issue, resolved within half an hour. Costs are controlled under 100 yuan, preventing bigger problems.