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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 end of a long, hard day and discover that the key fob is dead. Luckily, this is simple to fix it with a simple battery replacement from a hardware store or big box retailer.

Incorporating a spare key fob to your Mazda 3 can be an inexpensive way to save yourself from having to be towed to the dealership and having them reprogram your keys.

Battery Replacement

The battery replacement in the mazda car key replacement 3 key fob is an easy task that you can perform at home. But, it is best to replace the battery if it is dead, or if the key fob displays 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 as well as some patience. Locate a notch or gap in the bottom portion of the metal of your Mazda 3's key fob and then insert the tip of the screwdriver to remove the lower portion. Repeat the process for the top metal part however, be careful not to scratch the rubber ring that is at the bottom of the key fob's case.

Once the fob case has been open, you'll be able to see a slot on either side of the case that houses the battery. Start on one side of the case, and then gently open it. Remove the old CR2025 and replace it with a brand new one, making sure to place it face-up to ensure the correct the polarity. Finally, place the cap back on and reattach both sides to the key fob case, pressing until you can hear them click.

Now that you've replaced the battery, test the fob to confirm it is working by locking and unlocking your doors. If everything is in order, you can start using your mazda key car 3's remote capabilities for the first time!

Pairing Issues

If your key fob has stopped suddenly it could mean that the transmitter in the car has been damaged. This is usually a matter of the assistance of a professional for repair and will likely require a new replacement key fob.

If you've tried to replace the battery and reprogramme the key fob, but it hasn't worked it is possible that the chip inside the key fob could be faulty. This could be the case if the keyfob has been dropped, exposed to saltwater, or touched by dirty fingers.

You will need to locate the small "key" that is inserted into the seam, in order to remove the circuit board and diagnose the issue. You will then be able to look for any damage or corrosion on the electronic chip. It is recommended to use a clean towel to avoid damaging the microchip.

You may also examine the battery connector's terminals to see if they are damaged or cracked. If this is the situation then resoldering the terminals to their original position will usually bring back functionality to the key fob. You can also examine the buttons for damage or wear. If the buttons are loosened, they can be resoldered into place unless one has physically snapped.

Interference Signals

There's nothing more frustrating than trying to start your vehicle and getting the message "No Fob Detected". It happens at the worst time, for instance the time you're late to work or pick up your children from daycare/school. The good thing is that there are a few steps you can take to troubleshoot the issue and figure out the cause.

Interference signals can interfere with the remote key fob's signal from the vehicle making it unable to function properly. This can be caused from things like weather conditions, buildings, and transmitters using the same frequency. Interference may occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob.

In addition, if your key fob is exposed to salt or water it may be damaged. Water can penetrate the rubber seals of the electronic chip especially in the event that the key fob is submerged in water for an extended period of time. This can cause the chip to stop working and will require replacement of the key fob. If you have a key which can be programmed, you can clean it with isopropyl or electronic cleaners to restore its function. If this does not help the chip, it is likely to be fried and will require to be replaced.

Locking/Unlocking the Doors

The buttons on the fob's key send electronic signals to the solenoid in the car, which then transforms this signal into a mechanical action. It locks and unlocks doors. If the door lock isn't working, it could be a solenoid malfunction that requires investigation with the help of a professional auto repair shop.

A dead 12 volt battery can also prevent the fob from functioning correctly. This could happen if the battery loses charge or the contacts become corroded and stop conducting electricity. The good news is that a new battery is able to solve this issue in only minutes.

If the key fob isn't functioning after you replace the battery or try to re-program it then the problem may be with the receiver module. The device detects radio frequency signals sent by the key fob to control the vehicle. It could be a costly repair if it becomes faulty.

To determine if this is the case, start by inserting your spare keys into the key slot and turning the ignition to ON. Press the key fob button two times within 10 seconds without removing it. The mazda 3 car key 3 system synchronizes the key to the vehicle and you can use it as your primary remote for driving. You can program up to three keys in this way.