Changing the Battery in Your Mazda 3 Key Fob

There is nothing more frustrating than returning to your car after a long day, and discovering that the key fob battery is dead. This is a simple fix that is easily done at a big box retailer or hardware store.

A spare key fob for your Mazda 3 is an inexpensive alternative to not having to be towed to a dealership to have them reprogram the keys.

Battery Replacement

The battery replacement in the Mazda 3 key fob is an easy procedure that you can do at home. But, you should only replace the battery if it goes out of service, or if the key fob displays a message in the multi-information display saying, "Low key fob battery. Replace battery."

You'll need to use a flathead screwdriver, tape and patience to open the case. The flathead screwdriver's head in a notch, or gap on the bottom metal of the mazda replacement keys 3 key fob to pry the lower half off. Repeat this process for the top portion of the metal but be careful not to damage the rubber ring on the bottom of the key fob's case.

Once the fob's case is opened, you'll notice a slot on either side of the case, which houses the battery. Start on the other side of the case, and then gently open it. Remove the old battery and put in the new CR2025 ensure that it's in the right orientation for proper orientation. Install the cap on the battery again, and then attach both sides of your key fob case by pressing until they click.

After replacing the battery after replacing the battery, lock and unlock your doors to verify whether the fob works. If everything is in order then you're able to use the Mazda 3's remote features in the road!

Pairing Issues

This could be a sign that the transmitter in your car is damaged. It's usually a job for a professional, and you will require a brand new key fob.

If you've tried replacing the battery and reprogramme the key fob but it hasn't worked, the chip inside the key fob might be faulty. This can happen when the key fob was dropped on hard surfaces, exposed to salt water or even touched by dirty hands.

To diagnose this issue, you will need to locate a tiny "key" embedded in the fob's seam that lets you open it up and take out the circuit board. You can then check the electronic chip for damage or corrosion. To avoid damaging the chip, it is recommended to use a clean paper towel.

You may also take a closer look at the battery connector terminals to see if they are cracked or broken. If this is the case you can solder the terminals back into place will typically restore the functionality of the key fob. It is also possible to check the buttons for damage or wear. If the buttons are loose, they can easily be soldered back in place in the event that a button has physically snapped off.

Interference Signals

Few things are more frustrating than glancing at a "No Fob Detected" message when you attempt to start your car. This can happen at the most inconvenient possible times, like when you're running late to work or when you have to pick up your children from daycare/school. There are some things you can do to find out what's the cause.

Interference signals can disrupt the remote key fob signal coming from the vehicle which causes it to not work correctly. This could be caused by objects like buildings, weather conditions, and transmitters that operate on the same frequency. Interference may also occur if you have aftermarket equipment installed in the vehicle that transmits on the same frequency as the key fob.

In addition, if the key fob is exposed to water or salt water it may be damaged. The rubber seals on the chip's electronic components can be shattered by water, particularly if it is submerged for long periods of time such as in the ocean or a pool at the beach. This can cause the chip to cease working, requiring replacement of the key fob. If you have a key that is able to be programmed and cleaned using electronic cleaners or isopropyl to bring it back to its original function. If this doesn't help the chip, it is likely fried and will need to be replaced.

Locking and Unlocking of Doors

The buttons on the key fob transmit electronic signals to the solenoid inside the car, which then transforms the signal into mechanical action. It locks and unlocks doors. If the door lock doesn't work it could be due to an issue with the solenoid. This will require professionals from auto repair shops to investigate.

A dead battery of 12 volts can also prevent the fob from functioning correctly. This happens when the battery loses its charge or the contacts become corroded, and stop transferring electricity. The good news is that a new battery is able to resolve this issue in a matter of minutes.

If the key fob won't work after you have changed the battery or reprogram it, the issue might be in the receiver module. The device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle. If it malfunctions, it can be expensive to repair.

To check whether this is the case, begin by putting your spare key into the key slot and setting the ignition to ON. Press the key fob button twice within 10 seconds without removing it. The mazda replacement keys 3 system synchronizes the key with the vehicle, so you can use it as your primary remote for driving. This lets you program up to three keys.