1. Gather the necessary tools and parts. You will need a Phillips head screwdriver, a flat head screwdriver, and a new passenger side power window switch.
2. Park your Sienna in a safe location and turn off the engine.
3. Locate the passenger side power window switch. It is located on the passenger side door, near the armrest.
4. Remove the door panel. There are two screws that hold the door panel in place. One is located at the bottom of the door panel, and the other is located near the top of the door panel. Remove these screws with the Phillips head screwdriver.
5. Disconnect the electrical connector. There is a small electrical connector that connects the power window switch to the wiring harness. Disconnect this connector by pressing on the release tab and pulling the connector apart.
6. Remove the old power window switch. There are two screws that hold the power window switch in place. Remove these screws with the Phillips head screwdriver and remove the switch.
7. Install the new power window switch. Insert the new power window switch into the slot in the door panel and secure it with the two screws.
8. Reconnect the electrical connector. Push the electrical connector back into place until it clicks into place.
9. Reinstall the door panel. Replace the door panel and secure it with the two screws.
10. Test the power window switch. Roll up and down the window to make sure that the new switch is working properly.
That's it! You have now successfully replaced the passenger side power window switch on your 2003 Toyota Sienna.
