When the power window switch malfunctions or produces abnormal noises, the first step is to check whether the button is stuck. Gently press it to see if it can return to normal. If the button has weak rebound, the contacts may need cleaning. Spray an appropriate electronic contact cleaner onto the contacts and wipe them gently with a clean cloth.

If the issue persists, check the wiring harness to ensure proper connections and avoid malfunctions caused by poor contact. In addition, if abnormal sounds occur, they may be due to worn internal parts or insufficient lubrication of moving components. In such cases, apply a specialized lubricant directly to the relevant parts to reduce friction.

During the process, be especially careful to prevent moisture from entering, as this may lead to further issues. For buttons that frequently malfunction, replacement is recommended to ensure safe use.