1. Switch Assembly: The power window switch assembly might be faulty. Check the switch connections and ensure they are clean and free of any dirt or debris.
2. Relay: Although you have replaced the relays, it is possible that the replacement relay is faulty. If the relay is faulty, the window cannot be lowered. Try swapping the relay with another relay of the same type to see if that resolves the issue.
3. Power Window Motor: The power window motor is responsible for moving the window up and down. If the motor has failed, the window will not be able to move. Test the motor by applying a direct power source to it.
4. Window Regulator: If the window motor is getting power but the window does not move, it could be due to a problem with the window regulator. The window regulator is a set of gears and cables that move the window up and down. Inspect the regulator for any damage or obstructions and repair or replace it if necessary.
5. Wiring: Check all the wiring connections related to the power window system, especially the ground connection. Make sure they are clean, secure, and free of any damage. Use a multimeter to test the continuity of the wires and identify any breaks or shorts.
If none of the above steps help resolve the issue, you may need to consult a qualified mechanic or an auto electrician who specializes in electrical issues.
