1. Park your Sienna in a safe location and turn off the engine. Engage the parking brake to ensure that the vehicle does not roll while you are working.
2. Locate the wiper arm cap. It is usually a small, plastic cap located on the top of the wiper arm, close to the windshield.
3. Use a flat-head screwdriver or your fingernail to pry off the wiper arm cap.
4. Once the cap is removed, you will see a nut holding the wiper arm in place.
5. Use a wrench to loosen and remove the nut. Be careful not to drop the nut into the engine bay.
6. Once the nut is removed, lift the wiper arm up and away from the windshield.
7. To remove the old wiper blade, simply press the release tab on the wiper arm and slide the blade out of the arm.
8. Insert the new wiper blade into the wiper arm and slide it into place until it snaps into position. Make sure that the blade is securely fastened.
9. Replace the wiper arm cap.
10. Test the wiper by turning on the rear defroster and wiper switch. Make sure that the wiper blade wipes the windshield evenly and securely.
