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Changing the Battery in Your Mazda 3 Key Fob

There's nothing more annoying than stepping into your car after a long day, and discovering that the key fob battery is dead. This is a simple fix that can be done at a major box retailer or hardware store.

Incorporating a spare key fob to your Mazda 3 can be an affordable solution to free yourself from the hassle of being transported to a dealership and having them reprogram your keys.

Battery Replacement

Removing the battery from the mazda 6 key 3 key fob is a simple process that you can do at home. But, you should only replace the battery when it fails, or when the key fob shows a message on the multi-information display stating, "Low key fob battery. Replace battery."

To open the key fob case it requires a tape-wrapped flathead screwdriver, along with some patience. Find a gap or notch in the bottom portion of the metal of your Mazda 3's key fob, and then insert the head of the screwdriver into it to remove the lower half. Repeat this process for the top metal piece however, be careful not to damage the rubber ring at bottom of the key fob's case.

Once the fob case is open, you'll be able to see the slot on either side of the case that houses the battery. Use the tape-wrapped flathead screwdriver to gently pry the case open, beginning at one end and moving to the next. Remove the old CR2025 and replace it with a new one, making sure you put it on its face to ensure the correct the polarity. Then, put the cap of the battery back on and reconnect both sides of the key fob case, pressing until you can hear them click.

After replacing the battery Test the fob to make sure it's working by locking and unlocking your doors. If everything is in order you're good to go. Mazda 3 remote features can be used again.

Pairing Issues

If your key fob has stopped working all of a sudden, this could indicate that the transmitter inside the car is damaged. This is usually a matter of an expert repair and may require a replacement key fob.

If you've tried replacing the battery and reprogramming the key fob, but this has not solved the problem it is possible the chip in the key fob is damaged. This can occur if the key fob has been dropped on hard surfaces, exposed to salt water or even touched by dirty hands.

To determine the cause of the issue To determine the cause, you must locate a small "key" built into the seam of the fob that allows you to open it up and take out the circuit board. Then, you can examine the electronic chip for fob corrosion or damage. To avoid damaging the microchip, it is best to use a fresh paper towel.

You can also take a close look at the battery connector's terminals to see if they are damaged or cracked. If this is the case, then carefully soldering them back in place can usually restore the function of the key fob. Additionally, you can look at the buttons to determine whether they've been worn out or damaged. If the buttons are loose, they can be soldered back into place as well unless the button has actually snapped off.

Interference Signals

Few things are more annoying than gazing at an "No Fob Detected" message when you attempt to start your car. It can happen at the most unfavorable time, for instance when you're late for work or when you have to pick up your children from daycare or school. The good thing is that there are steps you can take to investigate the issue and determine what is causing it.

Interference signals can interfere with the remote key fob signal from the vehicle and cause it to not function properly. This can be caused by objects like weather conditions, buildings, and transmitters that operate on the same frequency. Interference can also occur if you have equipment from an aftermarket manufacturer installed in the vehicle that transmits on the same frequency as the key fob.

In addition, if your key fob is exposed to salt or seawater, it may be damaged. Water can penetrate the rubber seals of the electronic chip especially if the key fob is submerged in water for a long time. This could cause the chip to cease working and may require replacement of the key fob. If you have a key that has the ability to be programmed to work, you can clean it using isopropyl or electronic cleaners to bring it back to its original function. If this doesn't help then it's likely that the chip has been damaged and requires replacement.

Locking/Unlocking the Doors

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

A dead battery of 12 volts can also prevent the fob from functioning properly. This could happen if your battery loses its charge or if the contacts become corrosion-prone. The good news is that a new battery is able to solve this issue in only minutes.

If the key fob doesn't work after you have changed the battery or reprogram it, the issue might be related to the receiver module. This device receives radio frequency signals from the key fob and interprets them to control the vehicle's functions. It can be expensive to repair if it becomes faulty.

To test if this is true, put your spare key into the key slot. Then, turn the ignition on. Press the key fob button three times in a matter of 10 seconds without removing it. The Mazda 3 system will now connect the key to the car and allow you to use it as your primary remote for driving. This lets you program up to three keys.