1. Blown Fuse: The power window circuit may have a blown fuse. Check the fuse panel and replace any blown fuses.
2. Faulty Master Switch: The master window switch, which usually is placed on the driver's door, could be defective. Test the switch by replacing it temporarily with a known-good one.
3. Faulty Motor or Regulator: If one or more windows are affected, the issue could lie with the electric motor that raises and lowers the windows or the window regulator mechanism. Check for any abnormal noises or grinding when operating the windows, and inspect the cables for damage.
4. Connection Issues: Check the electrical connections related to the window circuit. Loose or corroded connections may disrupt the power supply to the instrument cluster. Clean and secure any loose connections.
5. Bad Instrument Cluster: In rare cases, the instrument cluster itself may be faulty. Test it by temporarily swapping it with a known-good one.
If diagnosing and fixing the problem is overwhelming or requires specialized electrical or mechanical expertise, it's recommended to consult a certified mechanic or a Toyota dealership for an accurate diagnosis and repair.
