What is the reason why the main driver of Volkswagen cannot control the four windows?
4 Answers
If the main driver of the Lavida cannot control the four windows, it may be due to a damaged window regulator or wiring issues. You can first check the plugs and fuses. The electric front windows have a one-touch up/down function with anti-pinch, so the BCM directly controls the front window switches and front window motors to achieve one-touch up/down and anti-pinch control. However, the rear window motors do not have the one-touch up/down with anti-pinch function, so they are not connected to the BCM. Here is some additional information: One-touch window control: One-touch window control refers to a system where the car window glass can be fully opened or closed with a single press of a button. Cars equipped with one-touch window control have a two-stage window control switch. The first stage works like a regular electric window. The second stage allows the window to automatically open or close completely with a single press and release. In contrast, regular electric windows require holding the switch until the window reaches the desired position, then releasing the button to stop the movement. Function: One-touch windows generally have an "anti-pinch" feature. During the automatic closing process, if an object is detected between the glass and the window frame, the window will stop closing and return to its initial position to prevent potential pinching hazards. The main purpose of one-touch windows is to provide convenience for drivers and passengers, reducing distractions from manually operating the windows and improving safety.
I've handled many similar cases where the driver's side can't control all windows. The most common issue is a faulty master switch. Think about it - when all four windows fail simultaneously, the problem usually lies in the switch assembly. It could be due to worn internal contacts causing signal failure. Another possibility is a blown fuse; check the window-labeled fuse in the driver's side left fuse box. Wiring harness shorts are also common, especially when aging wires break in the rubber boot connecting the door to the body. Window control module failures are relatively rare. If other door switches can control the windows normally, then it confirms the issue is with the driver's switch or related wiring. I recommend first trying to replace the fuse. If that doesn't work, have a repair shop remove the door panel to inspect the switch and wiring - Volkswagen door wiring harnesses are particularly prone to failure.
I had the same issue with my Volkswagen before, and it was quite annoying. First, you need to rule out the possibility of the windows being stuck, but the chance of all four windows getting stuck simultaneously is very slim. I tried using the individual window controls on each door, and they all worked, which means the problem lies with the master control on the driver's side. Most likely, the master switch assembly is faulty, and the buttons aren't responding when pressed. It could also be a loose wiring harness connector—a common issue with older Volkswagens. Another possibility, though less common, is a relay failure. I once took apart the door panel to check the wiring and found three broken wires in the harness near the door hinge. To be honest, it's best to leave such delicate work to a professional. They can quickly locate the issue using a multimeter, saving you time and effort.
If the driver's side cannot control all four windows, the entire control system needs to be considered. For example, oxidation of contact points in the window switch assembly can interrupt signal transmission. Checking the fuse is the easiest step—it's usually located behind the small storage compartment under the steering wheel. Wiring faults are also worth attention, especially the connecting wires inside the door panel, as wear and tear can cause open circuits. Another possibility is internal program errors in the control module, which may require reprogramming. Pay special attention to whether the wiring from the switch assembly to the central control unit is intact. If the other windows work fine with their individual switches, chances are the driver's side switch is faulty and replacing it should solve the issue.
