If your Honda key fob isn’t working like it used to, a dead battery is the most common cause. This simple guide will show you exactly how to change battery in Honda key fob, saving you a trip to the dealership.
It’s a quick and easy task that anyone can do at home with just a few basic tools. You’ll have your remote locking and unlocking back to normal in just a few minutes.
How to Change Battery in Honda Key Fob
Before you start, it’s helpful to know which style of key fob you have. Honda has used a few different designs over the years, but the process is similar for most models. The two most common types are the rectangular “switchblade” style with a flip-out key and the newer smart key fobs, often called “keyless remotes.”
We’ll cover the steps for both. First, let’s gather what you need.
What You’ll Need
You won’t need many supplies for this job. Having everything ready before you start makes the process smoother.
- A new battery. This is usually a CR2032 or CR1616 3-volt coin battery. Check your owner’s manual or the old battery to be sure.
- A small flat-head screwdriver or a sturdy plastic pry tool. A butter knife can work in a pinch, but be careful.
- A clean, well-lit workspace, like a table. This prevents tiny parts from getting lost on the floor.
- Optional: A pair of tweezers can be helpful for handling the small battery.
Identifying Your Honda Key Fob Type
Take a close look at your key fob. Identifying the type is the first real step.
- Standard Rectangular Fob (with buttons): This is the most common. It’s a rectangular remote, sometimes with a flip-out physical key. Models like the Civic, CR-V, and Accord from the 2000s to early 2020s often use this.
- Smart Key Fob (Keyless Entry): This fob is often more sculpted and may not have a visible key. The physical key is usually hidden inside a slot. You use the fob for proximity locking/unlocking. Common on higher-trim models.
If your fob has a small slot on the side, it likely has a release for a hidden key. This is a crucial part of opening it.
Step-by-Step Guide for Standard Honda Key Fobs
This method applies to most standard remotes where the key does not flip out. If your key flips out, see the next section.
- Find the Seam: Look at the sides of your key fob. You’ll see a thin seam running all the way around it. This is where the two halves of the case meet.
- Insert Your Tool: Take your small flat-head screwdriver or pry tool. Gently insert it into the seam. A good spot is often near the key ring hole or in a notch along the side.
- Twist to Separate: Apply gentle, twisting pressure with the tool. The goal is to pop the plastic clips that hold the case together, not to force it open. Work your way around the seam if needed.
- Open the Case: Once the clips are released, the two halves of the fob will seperate. Carefully pull them apart. Be mindful of the rubber button pad inside; it can fall out.
- Locate the Battery: Inside, you’ll see the circular battery held in a small compartment. It might be under a plastic bracket or just sitting in a slot.
- Remove the Old Battery: Use your fingernail, the screwdriver, or tweezers to pop the old battery out. Note which side (positive + or negative -) is facing up. Usally the positive side is up.
- Insert the New Battery: Place the new battery into the slot with the correct polarity. It should snap into place flatly.
- Reassemble the Fob: Align the two halves of the case carefully. Press them firmly together until you hear all the clips click back into place. Give it a gentle squeeze to ensure it’s secure.
For Flip-Key (Switchblade) Style Fobs
If your Honda key fob has a metal key that folds out, the opening process is slightly different.
- Extract the Hidden Key: First, look for a small release button or slide on the fob. Press or slide it to pull the physical metal key completely out of its slot.
- Use the Key as a Tool: With the key removed, you’ll see a narrow slot where it was stored. Insert the tip of the metal key itself into this slot. It’s designed to act as a lever.
- Twist the Key: Gently twist the key to pry open the fob casing. The two halves should start to seperate along the seam.
- Follow Battery Steps: Once open, follow steps 5 through 8 from the standard fob guide above to replace the battery and reassemble. Don’t forget to re-insert the metal key when you’re done.
Step-by-Step Guide for Honda Smart Key Fobs
Smart key fobs, used for keyless entry and push-button start, are a bit more sealed but still manageable.
- Remove the Hidden Key: Almost all smart fobs have a hidden physical key for the door. Find the small release switch, usually on the back or side, and slide it to pull out the emergency key.
- Find the Opening Notch: Look at the fob where the key was stored. There is often a small notch or groove near that area.
- Pry the Case Open: Insert your small screwdriver or the tip of the emergency key into this notch. Apply gentle, twisting pressure to pop the back cover off. It is held by clips.
- Access the Battery: Once the back is off, the battery will be visible. It’s usually a CR2032, held in place by a small plastic clip or just friction.
- Swap the Battery: Carefully lift the old battery out. Insert the new one, ensuring the positive (+) side is facing the correct direction (it’s usually marked on the plastic).
- Snap the Cover Back On: Align the back cover and press firmly around the edges until it clicks securely into place. Re-insert the emergency key into its slot.
Testing and Troubleshooting
After you’ve replaced the battery, it’s important to test the fob.
- Stand near your Honda and press the lock and unlock buttons. You should see the car’s lights flash or hear the locks cycle.
- If it doesn’t work, don’t panic. First, double-check that the battery is seated correctly and the polarity is right.
- Open the fob again and ensure the battery contacts are clean and not corroded. You can gently clean them with a cotton swab and a bit of rubbing alcohol if needed.
- Make sure you reassembled the fob completely. Sometimes if the halves aren’t fully snapped together, the buttons won’t make contact.
- If it still doesn’t work, try reprogramming the fob. The process varies by model, but often involves putting the car in programming mode with the driver’s door and ignition. Consult your owner’s manual for the exact steps for your Honda.
Rarely, the fob itself may be damaged. If you’ve tried a second new battery and reprogramming, it might be time to consult a dealership or locksmith.
Helpful Tips and Safety Notes
Keeping a few extra pointers in mind will make the process even easier and safer.
- Always handle the new battery by the edges. Oils from your skin on the faces can reduce its effectiveness.
- Dispose of the old battery properly. Many electronics stores or battery retailers have recycling bins.
- Write down your key fob’s part number (found inside the case) before you close it. This helps if you ever need a replacement.
- If your fob gets wet during the process, dry it thoroughly with a towel before putting in the new battery or reassembling.
- While the steps are similar, always refer to your specific vehicle’s owner manual for the most accurate information. They sometimes have little quirks.
Changing the battery yourself is a great way to save money. Dealerships often charge a significant fee for this simple service.
Frequently Asked Questions (FAQ)
What battery does my Honda key fob use?
Most Honda key fobs use a 3-volt coin battery, either a CR2032 or a CR1616. The CR2032 is the most common. The best way to know for sure is to open your fob and check the label on the old battery.
How often should I change my Honda key fob battery?
A typical Honda key fob battery lasts 2 to 4 years with normal use. If you have to get very close to the car for it to work, that’s a sign the battery is getting weak and should be replaced soon.
Can I change the battery in a Honda key fob myself?
Absolutely. As this guide shows, it’s a straightforward DIY task that requires only a new battery and a small tool. You do not need any special technical skills.
Will I need to reprogram my Honda remote after a battery change?
Usually, no. The key fob’s memory is retained during a simple battery swap. You should be able to use it immediately. If it stops working, a reprogramming procedure might be needed, which is also often doable at home.
Where can I buy a replacement battery for my Honda key?
You can find the correct battery at most pharmacies, supermarkets, electronics stores (like Best Buy), hardware stores (like Home Depot), or online retailers like Amazon. They are very inexpensive.
My key fob still doesn’t work after a new battery. What’s wrong?
First, re-check the battery orientation and assembly. If that’s correct, the fob may need reprogramming to the car. If reprogramming doesn’t fix it, there could be internal damage or a problem with the car’s receiver, requiring professional diagnosis.
Is it hard to open a Honda key fob?
Not at all. They are designed to be opened for battery service. The trick is to use gentle, prying pressure at the correct seam. Using the right tool prevents damage to the plastic case.
Final Thoughts
Replacing the battery in your Honda key fob is a simple and satisfying repair. With the right battery and a few careful steps, you can restore full functionality to your remote in less than five minutes.
Keeping a spare battery in your glove box is a smart idea, so you’re never stuck with a non-responsive fob. Remember to handle the components gently and double-check the battery’s position before closing the case. Now you can enjoy the convenience of your keyless entry for years to come without an unnessary expense.