Is your 2009 Toyota Prius key fob acting up? Perhaps it’s beeping at you after you turn off the engine, the operating range has diminished, or maybe it’s stopped working altogether. You might have even noticed the security key icon flashing on your dashboard. These are all common signs that your key fob battery is getting weak and needs replacing. Since your Prius relies on this battery to start – there’s no traditional mechanical key – swapping it out promptly is crucial.
Just like many Prius owners, I recently encountered these tell-tale signs with my “new” 2009 Prius. While changing the key fob battery is documented in your Prius Owner’s Manual (page 392 in my 2009 edition), I wanted to create a dedicated guide for keyfobprog.com, especially as it’s a common maintenance task. From my experience with both my 2008 and 2009 Prius models, the original batteries appear to be Panasonic, and they typically last for about 3 to 5 years – a reasonable lifespan.
This guide will walk you through the simple process of replacing your 2009 Toyota Prius Key Fob Battery. Let’s get started!
Tools You’ll Need
Before you begin, gather these simple tools:
- Precision Philips Screwdriver: A #0 Philips head screwdriver is essential for removing the small screws in the key fob. A set of precision screwdrivers will give you the best options.
- Thin Flat-head Screwdriver or Paperclip: You’ll need a thin, flat tool to gently pry open the key fob casing and the battery cover plate. A small flat-head screwdriver or even a straightened paperclip will work perfectly.
Parts Needed
- CR2032 Battery: You’ll need one CR2032 3V lithium battery. This is a widely available and inexpensive battery. You can find these at most drugstores, supermarkets, and electronics stores, or online.
Step-by-Step Guide to Replacing Your 2009 Prius Key Fob Battery
Replacing the battery is a straightforward process that should take only a few minutes. Follow these steps carefully:
Step 1: Remove the Mechanical Key
- Hold the key fob with the buttons facing upwards.
- Locate the small, spring-loaded holder on the side of the fob.
- Slide this holder to the left (indicated by RED in the image).
- While holding the slider to the left, pull the mechanical key up and out of the fob (indicated by BLUE in the image). Set the mechanical key aside.
Step 2: Open the Key Fob Casing
- Flip the key fob over so the buttons are facing down.
- Locate the same spring-loaded holder you used to remove the mechanical key.
- Slide this holder to the right (indicated by RED in the image).
- While sliding the holder to the right, push the back panel upwards (indicated by BLUE in the image). This back panel should slide off relatively easily.
- If the back panel is difficult to slide off, try using a rubber glove to improve your grip on the fob for better leverage.
Step 3: Access and Replace the Battery
- You will now see the internal components of the key fob, including the battery cover plate.
- Using your Philips #0 screwdriver, remove the four small screws circled in RED in the image. Keep these screws in a safe place so you don’t lose them.
- Once the screws are removed, use a paperclip or thin flat-head screwdriver to gently pry up the battery cover plate. The BLUE arrow in the image indicates a good spot to pry from. Be careful not to damage the plastic casing.
- With the cover plate removed, you will see the CR2032 battery.
- Take note of the battery orientation. The positive (+) side should be facing upwards, towards the cover panel.
- Remove the old CR2032 battery. You can gently pry it out with your fingertip or the flat-head screwdriver if needed.
- Install the new CR2032 battery, ensuring the positive (+) side is facing upwards, matching the orientation of the old battery.
Step 4: Reassemble the Key Fob
- Place the battery cover plate back into position, aligning the screw holes.
- Reinstall the four small Philips screws, tightening them gently but securely. Do not overtighten.
- Slide the back panel of the key fob back into place until it clicks securely.
- Finally, slide the mechanical key back into the key fob until it clicks into its locked position.
Step 5: Test Your Key Fob
Test the key fob to ensure it is working correctly. Try locking and unlocking your Prius remotely, and start the car to confirm the new battery has resolved the issue.
Tips and Troubleshooting
- Battery Orientation is Key: Double-check the orientation of the old battery before removing it and ensure you install the new battery in the same way (positive side up). Incorrect orientation will prevent the key fob from working.
- Gentle Prying: When prying open the battery cover, be gentle to avoid damaging the plastic components of the key fob.
- Static Electricity: While not usually a major concern, try to ground yourself by touching a metal object before handling the circuit board inside the key fob to minimize any risk of static discharge.
- If It Still Doesn’t Work: If your key fob still doesn’t work after replacing the battery, double-check that you have installed the battery correctly and that it is a fresh CR2032 battery. If problems persist, there might be another issue with your key fob, and you may need to consult a Toyota dealer or a professional automotive locksmith.
Key Fob Battery Life and Maintenance
The battery in your 2009 Toyota Prius key fob typically lasts between 3 to 5 years, depending on usage and environmental factors. To prolong the life of your key fob battery:
- Avoid Extreme Temperatures: Extreme heat or cold can shorten battery life. Avoid leaving your key fob in direct sunlight or freezing temperatures for extended periods.
- Limit Button Presses: While designed for regular use, excessive and unnecessary button presses can drain the battery faster.
- Regular Checks: Pay attention to the signs of a weak battery mentioned at the beginning of this guide. Replace the battery as soon as you notice these symptoms to avoid being stranded.
Conclusion
Replacing the battery in your 2009 Toyota Prius key fob is a simple DIY task that anyone can accomplish with a few basic tools and a new CR2032 battery. By following these steps, you can restore your key fob’s functionality and avoid the inconvenience of a dead battery. Keep your Prius running smoothly and enjoy the convenience of a working key fob!
Resources:
- Toyota Prius Owner’s Manual
- Prius Key FOB Transmitter by Luscious Garage
- Random YouTube video on FOB battery replacement (search on YouTube for “Prius key fob battery replacement” for numerous video guides)
