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Changing the Battery in Your Mazda 3 Key Fob

It can be a bit frustrating to pull into your car at the conclusion of a long and tiring day and discover that the key fob is dead. Luckily, this is an easy fix by purchasing an easy battery replacement at the hardware store or big box retailer.

The addition of a spare key fob to your Mazda 3 can be an affordable way to keep yourself from having to be transported to a dealership and having them reprogram your keys.

Battery Replacement

Changing the battery in your Mazda 3 key fob is a simple process that you can do at home. You should only replace it when the battery dies or if you notice a message stating "Low keyfob battery" on the multi-information display. Replace battery."

You'll need to use a flathead screwdriver, tape and patience to open the case. Find a gap or notch in the bottom metal part of the Mazda 3's key fob and then insert the tip of the screwdriver to pry off the lower portion. Repeat this process for the top metal part Be careful not to scratch the rubber ring at bottom of the key fob's case.

There's a slot on the opposite side of the case, where you can find the battery. Use the tape-wrapped flathead screwdriver to gently pry open the case, beginning on one side and then shifting to the other. Remove the old battery and then put in the new CR2025 ensure that it's facing up to ensure proper orientation. Finally, put the cap of the battery back on and reconnect both sides of the key fob case. Keep pressing until mazda key fobs hear them click.

After replacing the battery after replacing the battery, lock and unlock your doors to verify whether the fob works. If everything appears to be working the Mazda 3 remote features can be used again.

Pairing Issues

This could mean that the transmitter in your car is damaged. It is typically a need for a professional to repair and may require a replacement key fob.

If you have tried replacing the battery and reprogramming the key fob, but has not solved the problem it is possible the chip inside the key fob may be defective. This can happen if the keyfob has been dropped or exposed to saltwater or was touched by dirty fingers.

To identify the issue You will need to find a small "key" located in the fob's seam which allows you to open it up and remove the circuit board. Then, you will be able to examine for any damage or corrosion on the chip. To avoid damaging the chip, it is recommended to use a clean paper towel.

It is also possible to inspect the battery connector's terminals to determine if they're cracked or broken. If this is the case, then carefully connecting them back can often restore the function of the key fob. Also, you can check the buttons to see whether they are worn out or damaged. If they are loose, they can be soldered back into place, unless one has physically snapped.

Interference Signals

There is nothing more frustrating than gazing at the "No Fob Detected" message when trying to start your car. It usually happens at the most awkward times, such as the time you're late to work or if you're picking up kids from school/daycare. There are some things you could try to figure out what's causing the issue.

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

The key fob can also be damaged if exposed to salt water or water. The rubber seals on the electronic chip could be shattered by water, particularly when it is submerged over an extended period of time such as in a swimming pool or at the beach. This can cause the chip to stop working, requiring replacement of the key fob. If you have a programmeable key, you can clean the chip using isopropyl alcohol or an electronic cleaner to help it come back to normal. If this does nothing, it is likely that the chip has burned out and requires replacement.


Locking or Unlocking the Doors

The buttons on the key fob transmit electronic signals to a solenoid inside the car. It then converts that signal into a mechanical action that locks and unlocks the doors. If your door lock isn't working it could be due to an issue with the solenoid. This will require professional repair shops to analyze.

A dead 12 volt could also prevent the fob from working properly. This could happen if the battery is unable to charge or if the contactors are corroded and stop transmitting electricity. This issue can be resolved in just a few minutes by purchasing a new battery.

The receiver module could be the problem if the key fob doesn't work after replacing batteries or reprogram the device. The device receives radio frequency signals from the key fob and interprets them into controlling the vehicle's functions. It could be a costly repair if it is damaged.

To check if this is the case, begin by putting your spare key into the key slot and turning the ignition to ON. Press the key fob two times within 10 seconds, but without removing it. The Mazda 3 system will now synchronize the key with the car and you can use it as your primary remote for driving. You can program up to three keys this way.

Read More: https://www.thekeylab.co.uk/mazda-car-keys/