How To Change Battery Infiniti Key

Changing the battery in your Infiniti key fob is a relatively straightforward task, but it's one that every Infiniti owner will inevitably face. A dead key fob battery can leave you stranded or unable to access and start your vehicle. This article will guide you through the process, providing a detailed technical breakdown, highlighting common issues, and offering best practices to ensure a smooth and successful battery replacement.

Understanding the Infiniti Intelligent Key System

Before diving into the battery replacement procedure, it's crucial to understand the basics of the Infiniti Intelligent Key System. This system, common in modern vehicles, allows for keyless entry and ignition. Instead of a traditional metal key, the Intelligent Key communicates wirelessly with the vehicle's onboard computer via Radio Frequency Identification (RFID) and, depending on the model, Near Field Communication (NFC). When you press the unlock button on the fob, it transmits a coded signal that the car's receiver recognizes. If the code matches, the doors unlock. Similarly, when you press the start button with the key fob inside the vehicle, the system authenticates the key and allows the engine to start. The system relies on a constant power source within the key fob itself – the battery.

Components of the Intelligent Key Fob

The key fob contains several key components:

Battery: Typically a CR2032 or similar coin cell battery. This provides the power for all the fob's functions.
Printed Circuit Board (PCB): The heart of the fob, containing the microcontrollers, antenna, and other electronic components that process signals and communicate with the vehicle.
Buttons: These activate specific functions, like locking/unlocking doors, opening the trunk, or activating the panic alarm.
Antenna: This transmits the radio frequency signal to the vehicle's receiver.
Housing: The plastic or metal casing that protects the internal components.
Emergency Key: A physical key hidden within the fob that can be used to manually unlock the door in case of battery failure or system malfunction.

Technical Breakdown: Replacing the Battery

Now, let's get to the core of the matter: replacing the battery. This process can vary slightly depending on your specific Infiniti model, but the general steps remain the same.

Gather Your Tools: You'll need a small flathead screwdriver (preferably plastic to avoid damaging the fob), a new CR2032 battery (or the battery type specified in your owner's manual), and a soft cloth to protect the fob's surface. Optionally, have a small Phillips head screwdriver if your fob has screws.
Access the Emergency Key: Most Infiniti key fobs have a mechanical emergency key that slides out. Locate the release button or latch on the fob (usually on the back or side) and press or slide it to release the key. Set the key aside in a safe place.
Open the Key Fob Housing: This is where the process can differ slightly. Some fobs have a small slot near where the emergency key was located. Insert the flathead screwdriver into this slot and gently twist. This should pry the two halves of the fob apart. Be patient and apply even pressure to avoid breaking the plastic. Other fobs might have small screws holding the two halves together. If you see screws, use the appropriate sized Phillips head screwdriver to remove them before attempting to pry the fob open. Do not force the fob open if it doesn't come apart easily; double-check for hidden screws or latches.
Locate the Battery: Once the fob is open, you'll see the PCB and the battery. The battery is usually held in place by a small clip or bracket.
Remove the Old Battery: Use the flathead screwdriver to gently pry the old battery out of its holder. Be careful not to damage the PCB or the battery contacts. Note the orientation of the battery; the positive (+) side usually faces up.
Install the New Battery: Insert the new battery into the holder, making sure the positive (+) side is facing the correct direction. The battery should snap into place securely.
Reassemble the Key Fob: Carefully align the two halves of the fob and snap them back together. Ensure that all the edges are flush and that the fob is securely closed. If your fob had screws, re-install and tighten them carefully, being sure not to overtighten and strip the threads.
Test the Key Fob: Press the buttons on the fob to ensure they are working. Try locking and unlocking your car remotely. If the fob doesn't work, double-check that the battery is installed correctly and that the fob is properly assembled.
Reinsert the Emergency Key: Slide the emergency key back into its slot until it clicks into place.

Common Issues and Maintenance Concerns

While replacing the battery is generally simple, several common issues can arise:

Incorrect Battery Type: Using the wrong battery type can damage the key fob or prevent it from working correctly. Always refer to your owner's manual or the markings on the old battery to ensure you're using the correct replacement.
Damaged Fob Housing: Applying too much force when opening the fob can crack or break the plastic housing. Be gentle and patient, and use the correct tools.
Damaged PCB: Carelessness when removing the battery can damage the PCB, rendering the fob useless. Handle the PCB with extreme care.
Bent Battery Contacts: The battery contacts can become bent or corroded over time, preventing proper electrical connection. Clean the contacts with a cotton swab dipped in isopropyl alcohol if necessary. Gently bend the contacts back into place if they are bent.
Key Fob Still Not Working: If the fob still doesn't work after replacing the battery, the problem could be more serious. The fob may need to be reprogrammed by a dealership or a qualified automotive locksmith. It's also possible that the fob itself is faulty and needs to be replaced.
Water Damage: Water damage to the internal components can lead to corrosion and malfunction. Avoid exposing the key fob to excessive moisture.

Maintenance Tips

Regularly check battery strength. Many Infiniti models display a low key fob battery warning on the dashboard. Heed these warnings and replace the battery promptly.
Keep the key fob clean and dry. Wipe the fob with a soft, dry cloth to remove dirt and debris.
Store the key fob in a safe place. Avoid exposing the fob to extreme temperatures or direct sunlight.
Consider a protective case. A silicone or hard plastic case can help protect the fob from damage.

Do's and Don'ts / Best Practices

To ensure a successful battery replacement, follow these do's and don'ts:

Do's

Do use the correct battery type.
Do use the correct tools for the job.
Do be gentle when opening the fob and removing the battery.
Do note the orientation of the old battery before removing it.
Do clean the battery contacts if necessary.
Do test the fob after replacing the battery.
Do consult your owner's manual for specific instructions for your Infiniti model.

Don'ts

Don't force the fob open.
Don't use excessive force when removing the battery.
Don't touch the PCB with your bare fingers; static electricity can damage sensitive components.
Don't use sharp or metallic objects to pry open the fob, which can damage the housing or internal components.
Don't overtighten screws if your fob has them.
Don't dispose of old batteries improperly; recycle them according to local regulations.

Conclusion

Replacing the battery in your Infiniti key fob is a manageable task that can save you time and money. By understanding the Intelligent Key system, following the detailed steps outlined above, and adhering to the do's and don'ts, you can confidently perform this maintenance task yourself. However, if you encounter any difficulties or are uncomfortable working with electronic components, it's always best to consult a qualified mechanic or automotive locksmith. And remember, always keep a spare battery on hand to avoid being caught off guard by a dead key fob.