Is your Toyota Prius key fob acting up? Are you experiencing a reduced range, inconsistent locking/unlocking, or seeing a key symbol flashing on your dashboard? These are common signs that your Prius key fob battery is running low and needs replacement. Don’t worry, this is a simple and inexpensive DIY task you can easily accomplish at home in just a few minutes. This guide will walk you through How To Replace Battery In Prius Key Fob for 2004-2009 models, ensuring you get back to enjoying the convenience of your keyless entry system without a trip to the dealership.
Before you begin, please note this guide is for informational purposes and you should always consult your vehicle’s owner’s manual for specific instructions and safety information.
What You’ll Need:
- Precision Phillips Screwdriver (#0 or similar): Essential for removing the small screws in the key fob.
- Small Flat-head Screwdriver or Paperclip: To help pry open the battery compartment cover.
- CR2032 Battery: This is the standard replacement battery for 2004-2009 Toyota Prius key fobs. You can find these at most drugstores, supermarkets, and online retailers.
Step-by-Step Battery Replacement:
Let’s get started with the Prius key fob battery replacement process. Follow these simple steps to revitalize your key fob.
Step 1: Remove the Emergency Key
To begin, locate the small lever or button on the side of your Prius key fob, near the key ring. With the button side facing upwards, slide the spring-loaded release to the left (usually indicated in RED on diagrams) and simultaneously pull the mechanical emergency key straight up and out of the fob (as shown in BLUE). Set the emergency key aside in a safe place. This key is a backup and can be used to manually unlock the driver’s side door if needed, but it is not required for this battery replacement process. Removing it simply provides better access to the key fob casing.
Step 2: Open the Key Fob Casing
Now, flip the key fob over so the buttons are facing downwards. Locate the same spring-loaded holder you used in Step 1. This time, slide the holder to the right (again, usually RED in diagrams). While holding it in this position, gently push the back panel of the key fob upwards (indicated in BLUE). The back panel should slide off relatively easily, revealing the internal components of the key fob. If you encounter slight resistance, try using a rubber glove for a better grip on the fob to help slide the back panel. Avoid using excessive force, as you could damage the casing.
Step 3: Access the Battery Compartment
With the back cover removed, you’ll now see the internal circuit board and the battery compartment cover. Identify the four small screws, usually silver or gold, that secure the battery cover plate. These are typically circled in RED in diagrams for clarity. Using your precision Phillips #0 screwdriver, carefully remove all four screws. Once the screws are removed, you will need to gently pry off the battery cover plate. Locate the small notch or gap (indicated by the BLUE arrow in the image) designed for prying. Insert a paperclip or thin flat-head screwdriver into this gap and gently pry upwards. The cover should pop off, exposing the battery.
Step 4: Replace the Old Battery with a New CR2032
Now you can see the old CR2032 battery. Take note of the battery orientation before removing it. Typically, the positive (+) side of the battery faces upwards, towards the cover panel. Gently remove the old battery. You can use your fingertip or the small flat-head screwdriver to carefully lever it out if needed. Take your new CR2032 battery and insert it into the compartment, ensuring the positive (+) side is facing upwards, matching the original orientation.
Step 5: Reassemble the Key Fob
Assembly is simply the reverse of the disassembly process.
- Place the battery cover plate back into position and re-insert and tighten the four small Phillips screws. Be careful not to overtighten them, as this could damage the plastic casing.
- Slide the back panel of the key fob back into place until it clicks securely.
- Finally, re-insert the emergency mechanical key until it locks into place.
Testing Your Key Fob
Once you have reassembled your key fob, test it to ensure the battery replacement was successful. Try locking and unlocking your Prius remotely, and start the car to confirm the key fob is functioning correctly. If you had previously experienced warning signs like reduced range or a flashing key symbol, these should now be resolved.
Conclusion
Replacing the battery in your Toyota Prius key fob is a straightforward maintenance task that anyone can do with a few simple tools and a new CR2032 battery. By following these steps, you can save yourself time and money compared to visiting a dealership for this minor repair. Keeping your key fob battery fresh ensures reliable access to your vehicle and avoids potential inconvenience. Regular battery replacement, typically every 2-3 years or when you notice symptoms of a weak battery, will keep your Prius key fob working optimally.
