Is your Honda key fob displaying a low battery warning on your dashboard? Don’t worry, replacing the battery in your Honda key fob is a straightforward task you can easily do yourself. This guide provides a comprehensive, step-by-step walkthrough on how to replace your Honda key fob battery, saving you time and money compared to visiting a dealership.
Before we begin, it’s important to understand why your key fob battery needs replacement. Typically, Honda key fob batteries last for a couple of years depending on usage. When the battery starts to weaken, you might notice a warning message on your Honda’s instrument panel, or you may experience a decreased range when using your key fob to lock or unlock your doors. Ignoring these signs could eventually lead to a completely dead key fob, leaving you unable to remotely access your vehicle.
This guide will walk you through the process of replacing your Honda key fob battery quickly and efficiently. Let’s get started!
What You’ll Need to Replace Your Honda Key Fob Battery
Replacing your Honda key fob battery is a simple DIY task requiring minimal tools. Here’s what you will need:
- New CR2032 Battery: This is the standard battery type for most Honda key fobs. It’s a good idea to have a spare CR2032 battery on hand. You can purchase these batteries at most drugstores, supermarkets, and online retailers. Buying a multi-pack can be more economical, especially if you have multiple Honda vehicles or key fobs.
- Small Flathead Screwdriver or Emergency Key: A small flathead screwdriver will help you gently pry open the key fob casing. Alternatively, as we’ll explore, the emergency key hidden within your key fob can also be used for this purpose, often proving to be the most convenient tool.
Step-by-Step Guide to Replace Your Honda Key Fob Battery
Follow these simple steps to replace your Honda key fob battery:
Step 1: Remove the Emergency Key
The first step is to remove the mechanical emergency key from your Honda key fob. This key is a backup to unlock your car manually if the battery is dead or the remote system malfunctions.
Locate the small release button or slider on your key fob. It’s usually a small switch on the side or back of the fob. Slide or press this release, and the emergency key should slide out. Pull the key out completely and set it aside.
Side Note: The emergency key isn’t just for emergencies! It can also be used to open the trunk in situations where your car’s 12V battery is dead and you need access to the trunk, perhaps to get to a portable jump starter. The trunk lock cylinder is usually located behind the driver-side rear passenger headrest.
Step 2: Open the Key Fob Casing
With the emergency key removed, you now need to open the key fob casing to access the battery compartment.
The owner’s manual might suggest using a coin wrapped in cloth to avoid scratches. However, a more practical and often readily available tool is the emergency key you just removed.
Locate the small slots or tabs on the key fob casing where it splits into two halves. These tabs are usually visible after removing the emergency key. Insert the tip of your emergency key (or a small flathead screwdriver) into the slot between these tabs.
Gently twist or pry the key (or screwdriver) to separate the two halves of the key fob casing. You should feel a slight click as the casing begins to split. Work your way around the seam, gently prying until the two halves are completely separated.
Step 3: Remove the Old Battery
Once the key fob is open, you will see the CR2032 battery. Be careful at this stage, as the circuit board and buttons inside are not firmly secured and could potentially be dislodged.
The battery is typically held in place by small tabs. Carefully use your small flathead screwdriver to gently pry the old battery out from under these tabs.
Helpful Tip: To prevent accidentally dislodging the circuit board and buttons, place the key fob flat on a table while removing the battery. Hold the fob firmly against the table with one hand, and use the screwdriver in your other hand to pry the battery upwards. This stabilizes the circuit board and prevents it from lifting up with the battery.
Step 4: Insert the New Battery
Take your new CR2032 battery and insert it into the battery compartment. Ensure the positive (+) side of the battery is facing upwards (usually indicated in the battery compartment).
Slide one edge of the battery under the retaining tabs (usually the two tabs highlighted in yellow in the image above), and then press down on the other side until the battery snaps securely into place under the remaining tabs.
Step 5: Close the Key Fob Casing
Now it’s time to reassemble the key fob. Align the two halves of the casing and press them firmly back together until they snap closed.
Helpful Tip for Easier Closing: If you find it difficult to snap the casing completely closed, try this technique: First, align the two halves perfectly. Then, apply pressure to the end of the fob opposite to where the emergency key is inserted. Once that end snaps together, apply pressure to the emergency key end to close the casing completely. This method often requires less force and ensures proper alignment.
Once the key fob is reassembled, test it to ensure it’s working correctly. The low battery warning on your dashboard should disappear, and your key fob should function normally.
Helpful Tips for Honda Key Fob Battery Replacement
- Use the Emergency Key to Open the Fob: As mentioned, the emergency key is perfectly designed to open the key fob casing, often making it a more convenient tool than a coin or screwdriver.
- Keep the Fob Flat When Removing the Battery: This prevents accidental dislodging of internal components.
- Consider a Key Fob Cover: To protect your key fob from scratches and wear and tear, consider purchasing a silicone cover. These are readily available online and can help extend the lifespan and appearance of your key fob.
Replacing your Honda key fob battery is a simple and cost-effective way to maintain your vehicle. By following these steps, you can easily handle this task yourself and ensure your key fob is always ready to go.
