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Changing the Battery in Your Mazda 3 Key Fob

It is frustrating to pull into your car at the end of a long day and discover that your key fob is dead. Fortunately, it is an easy fix by purchasing the simple replacement of a battery at the hardware store or big box retailer.

A spare key fob to your Mazda 3 can be an affordable way to keep yourself from the hassle of being driven to the dealership and having them re-program your keys.

Battery Replacement

You can replace the battery on your Mazda 3 keyfob at home. It is recommended to replace it when the battery fails or you get a message that reads "Low keyfob battery" on the multi-information display. Replace mazda key battery."

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

There is a slot on both sides of the fob case that houses the battery. Make use of the tape-wrapped flathead screwdriver to gently open the case, beginning with one side and moving to the next. Remove the old CR2025 and replace it with a new one, making sure that you place it face-up to ensure the correct the polarity. Put the cap of the battery on again and secure both sides of your key fob case by pressing until they click.

After replacing the battery, lock and unlock your doors to ensure that the fob works. If everything looks good the Mazda 3 remote features can be used again.

Pairing Issues

This could mean that the transmitter in your car has been damaged. This is usually a matter for a professional and you will need a new key fob.

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

You'll need to locate a small "key", which is built into the seam to remove the circuit board to identify the problem. You can then examine the chip for corrosion or damage. It is best to use a clean paper towel to keep the microchip from being damaged.

You may also inspect the battery connector's terminals to examine if they're damaged or cracked. If this is the case, then carefully reconnecting them will usually restore the function of the key fob. Additionally, you can look at the buttons to see whether they're worn or damaged. If the buttons are loose they can be resoldered into position, unless they've physically snapped.

Interference Signals

There is nothing more frustrating than staring at the "No Fob Detected" message when you attempt to start your car. This typically happens at most unpopular moments, like when you are late for work or picking up children from school/daycare. The good news is that there are steps you can take to troubleshoot the issue and figure out the cause.

Interference signals can cause the remote key fob to stop functioning properly. This can be caused by things like buildings, weather conditions and transmitters that operate on the same frequency. Interference can also occur if you have an aftermarket device installed in your vehicle that transmits at the same frequency as the key fob.

In addition, if your key fob is exposed to salt or seawater, it may be damaged. The rubber seals on the electronic chip could be damaged by water, particularly if it is submerged for long periods of time like in a swimming pool or at the beach. This can cause the chip to stop functioning and require replacement mazda key of the key fob. If you have a key which can be programmed to work, you can clean it with isopropyl and electronic cleaners to restore its function. If this does nothing will be able to fix the issue, then the chip has burned out and will need to be replaced.

Locking and Unlocking the Doors

The buttons on the key fob transmit 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, the issue may be a solenoid issue that requires investigation with the assistance of an expert auto repair shop.

A dead 12 volt battery can hinder the fob from functioning correctly. This could happen if the battery loses charge, or if the contacts become corroded and stop conducting electricity. This issue can be solved in minutes with a new battery.

The receiver module could be the cause if the key fob doesn't work after you replace the battery or reprogram the device. This device receives radio frequency signals from the key fob and interprets them to control the functions of the vehicle. If it fails, it can be expensive to repair.

To verify if this is correct, place your spare key into the key slot. Then turn the ignition ON. Press the key fob button twice in a matter of 10 seconds without removing it. The Mazda 3 system will now connect the key to the car and you can use it as your primary remote for driving. This allows you to program up three keys.