Is your 2009 Toyota Prius key fob starting to act up? Maybe it’s beeping at you after you turn off the engine, or perhaps the remote range has diminished. You might have even noticed the security key icon flashing on your dashboard. These are all tell-tale signs that your key fob battery is running low and needs replacing. Since your Prius relies entirely on this electronic key, and lacks a traditional mechanical key start, it’s crucial to address this issue promptly. Fortunately, changing the battery in your 2009 Toyota Prius key fob is a simple task you can easily do yourself. This guide will walk you through each step, ensuring you can get your key fob back in top shape in no time.
Before we begin, remember to prioritize safety. While this is a straightforward procedure, taking precautions is always wise.
Tools You’ll Need:
- Precision Screwdrivers: You’ll need a Philips head screwdriver, size #0 is ideal. A set of precision screwdrivers is recommended for delicate work.
- Thin Flat-head Screwdriver or Paperclip: This will be used for gently prying open the key fob components.
Parts Required:
- CR2032 Battery: This is the standard battery type for most Toyota Prius key fobs. It’s readily available at most drugstores, supermarkets, and online retailers. Panasonic is often the original manufacturer, but any reputable brand of CR2032 battery will work.
Step 1: Removing the Emergency Key
To start, locate the emergency key release mechanism on your key fob. With the buttons facing upwards, you’ll see a small, spring-loaded holder. Slide this holder to the left (indicated in RED). While holding it in this position, pull the emergency key upwards and out (indicated in BLUE). This key is a backup and can be used to manually unlock the driver’s side door if needed, but it’s not used for starting the car. Set the emergency key aside in a safe place.
Step 2: Accessing the Key Fob Casing
Now, flip the key fob over so the buttons are facing downwards. You’ll again see a spring-loaded holder, similar to the one you just used for the emergency key. This time, slide the holder to the right (indicated in RED). While sliding it to the right, push the back panel upwards (indicated in BLUE). This 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 to improve your grip on the fob for better leverage. Avoid using excessive force, as you don’t want to damage the casing.
Step 3: Exposing the Battery
With the back panel removed, you’ll now see the circuit board and the battery cover plate. Locate the four small screws circled in RED. These screws secure the battery cover plate. Using your Philips #0 screwdriver, carefully remove all four screws. Once the screws are removed, you can use your paperclip or thin flat-head screwdriver to pry up the battery cover plate. The BLUE arrow in the image indicates a good spot to gently pry from. Insert the paperclip or screwdriver into the small slot and gently lift upwards. The cover plate should pop off, exposing the CR2032 battery.
Step 4: Replacing the Battery
Now you can access the old CR2032 battery. Take note of the battery orientation before removing it. The positive (+) side of the battery should be facing upwards, towards the cover panel you just removed. Gently pry out the old battery. Install the new CR2032 battery, ensuring the positive (+) side is facing upwards as well. Once the new battery is securely in place, you can begin reassembling the key fob.
Step 5: Reassembly
Assembly is simply the reverse of the disassembly process.
- Place the battery cover plate back over the battery, ensuring it’s aligned correctly.
- Reinstall the four small Philips screws, tightening them gently but firmly. Avoid over-tightening.
- Slide the back panel back onto the key fob until it clicks into place.
- Finally, slide the emergency key back into its slot until it locks securely.
Testing Your Key Fob
Once you’ve reassembled your key fob, test it to ensure it’s working correctly. Try locking and unlocking your Prius remotely, and start the car to confirm the new battery has resolved the low battery warnings.
Lifespan and Maintenance Tips
Typically, a Toyota Prius key fob battery lasts between 3 to 5 years under normal usage conditions. Factors like frequency of use and environmental conditions can affect battery life. To prolong the life of your key fob battery:
- Avoid storing your key fob in extreme temperatures.
- Keep your key fob away from excessive moisture.
- Consider replacing the battery every 3 years as preventative maintenance, even if you haven’t noticed any warning signs yet.
By following these simple steps, you’ve successfully replaced the battery in your 2009 Toyota Prius key fob. This DIY task can save you time and money compared to visiting a dealership for a battery replacement. Enjoy the peace of mind knowing your key fob is powered up and ready to go! If you encounter any difficulties or are uncomfortable performing this replacement yourself, always consult a qualified automotive technician.
