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Changing the Battery in Your Mazda 3 Key Fob

There's nothing more frustrating than stepping into your vehicle after a long and tiring day and realizing that the key fob battery is dead. This is a simple solution that can be accomplished at a big box retailer or hardware store.

A spare key fob to your mazda replacement key fob 3 can be an inexpensive way to save yourself from the hassle of being transported to a dealership and having them reprogram your keys.

Battery Replacement

You can change the battery on your Mazda 3 keyfob at home. However, you should replace the battery when it is dead, or if the key fob displays a message on the multi-information display that reads, "Low key fob battery. Replace battery."

To open the key fob's casing You'll need a tape wrapped flathead screwdriver, along with some patience. Locate a notch or gap in the bottom metal part of the 2016 mazda 3 Key fob programming 3's key fob, and then insert the head of the screwdriver into it to cut off the lower half. Repeat the procedure for the top piece of metal Be careful not to damage the rubber ring at the bottom of the case.

Once the fob case is open, you'll be able to see an opening on either side of the case, which houses the battery. Start on the opposite side of the case, and then gently open it. Take out the old CR2025 and replace it with a brand new one, making sure that you place it face-up to ensure proper direction of polarity. Then, put the battery cap back on and then reattach both sides of the key fob's case. Continue pressing until you hear them click.

After you've replaced the battery, test the fob to confirm it works by locking and unlocking your doors. If everything appears to be working then you're able to use your Mazda 3's remote features for the first time!

Pairing Issues

If your key fob stops working all of a sudden it could be a sign that the transmitter inside the car is damaged. It's usually a job that requires a professional. You will need a new key fob.

If you've tried replacing the battery and reprogram the key fob but it hasn't worked then the chip in the key fob might be defective. This can happen if the key fob was dropped on hard surfaces and exposed to salt water or even touched by dirty hands.

To identify the issue You will need to find a small "key" built into the fob's seam that lets you open it and take out the circuit board. Then, you will be able check for any damage or corrosion on the electronic chip. It is recommended to use a clean, dry paper towel to avoid damaging the microchip.

It is also possible to take a close look at the battery connector terminals to see if they are cracked or broken. If this is the case, carefully attaching them back can generally restore the functionality of the key fob. You can also inspect the buttons for wear or damage. If the buttons are loose, they can easily be re-soldered regardless of whether the button is physically snapped off.

Interference Signals

Few things are more annoying than gazing at the "No Fob Detected" message when trying to start your car. This typically happens at most inconvenient times, such as the time you're late to work or when you are picking up your children from daycare or school. There are some things you can do to help figure out what's causing the problem.

Interference signals can cause the remote key fob to cease working in a proper manner. This could be caused by things like buildings, weather conditions, and transmitters that use the same frequency. Interference can also occur when you have equipment from an aftermarket manufacturer installed in your vehicle that transmits at the same frequency as the key fob.

The key fob can also be damaged if it is exposed to salt water or water. The water can penetrate the rubber seals of the electronic chip, especially when the key fob is submerged in water for a lengthy period of time. The chip may cease to function and require replacement of the keyfob. If you have a programmable key it is possible to clean the chip with isopropyl Alcohol or an electronic cleaner to aid in its get back to its original functionality. If this doesn't work then it's likely that the chip has burned out and requires replacement.

Locking/Unlocking the Doors

The key fob's buttons send electronic signals to the solenoid inside the car, which transforms the signal into a mechanical action that locks and unlocks the doors. If the door lock isn't working, it could be a solenoid issue that requires some investigation by an expert auto repair shop.

A dead 12 volt battery could hinder the fob from functioning correctly. This can happen if the battery is unable to charge or the contacts become corroded and stop conducting electricity. This issue can be resolved in just a few minutes by purchasing a new battery.

If the key fob isn't functioning after you have changed the battery or re-program it, the issue might be with the receiver module. The device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle. It could be a costly repair if it is damaged.

To verify if this is true, place your spare key into the key slot. Then, turn the ignition ON. Press the key fob two times in a period of 10 seconds, without removing it. The Mazda 3 system synchronizes the key with the vehicle and you can now use it as your primary remote for driving. This allows you to program up to three keys.