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Changing the Battery in Your Mazda 3 Key Fob

There’s nothing more frustrating than getting in your car after a long work day and finding that the key fob battery is dead. Fortunately, it is simple to fix it with an easy battery replacement at an electronics store or big box retailer.

Adding a spare key fob to your Mazda 3 can be an affordable way to keep yourself from the hassle of being taken to the dealer and having them re-program your keys.

Battery Replacement

Changing the battery in the Mazda 3 key fob is an easy task that you can do at home. You should only replace it if the battery is dead or you get a message that reads “Low keyfob battery” on the multi-information display. Replace battery.”

You’ll need a flathead screwdriver, tape and patience to open the case. Locate a notch or gap in the bottom part of the metal of your Mazda 3’s key fob, and insert the head of the screwdriver in it to remove the lower half. Repeat this step for the top portion of the metal, but be careful not to damage the rubber ring at the bottom of the key fob’s case.

When the fob case is opened, you’ll notice a slot on either side of the case, which houses the battery. Make use of the tape-wrapped flathead screwdriver to gently open the case, beginning on one side and then moving to the other. Remove the old CR2025 and replace it with a new one, making sure to place it face-up to ensure the correct polarity. Put the cap of the battery on 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 test that the fob is working. If everything is in order then you’re able to use the Mazda 3’s remote functions for the first time!

Pairing mazda 3 replacement key fob

If your key fob stop functioning suddenly, this could indicate that the transmitter inside your car has been damaged. This usually requires an expert to repair it and will likely require a new key fob.

If you’ve tried replacing the battery and reprogramming the key fob, but isn’t solving the issue, it is possible that the chip inside the key fob might be damaged. This could happen if the keyfob has been dropped, exposed to saltwater, or was touched by dirty fingers.

To determine the cause of the issue To determine the cause, you must find a small “key” that is embedded into the seam of the fob that allows you to lift it open and remove the circuit board. You will then be able to examine for any damage or corrosion on the chip. To prevent damaging the microchip, it is recommended to clean the chip with a new paper towel.

If you are unsure you are not sure, you can check the battery connector terminals for cracks, or breaks. If this is the situation, soldering the terminals back into place will typically restore functionality to the key fob. Similarly, you can inspect the buttons to determine whether they’ve been worn out or damaged. If the buttons are loosened, they can be resoldered into place, unless one has physically snapped.

Interference Signals

There are few things more frustrating than looking at a “No Fob Detected” message when trying to start your car. This can happen at the most inconvenient possible times, like when you’re late for work or have to pick up your children from daycare or school. The good news is that there are a few steps you can take to investigate the issue and determine the cause.

Interference signals can disrupt the remote key fob’s signal from the vehicle, causing it to not work properly. This can be caused by things like weather conditions, buildings, and transmitters that use the same frequency. Interference can occur when your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob.

The key fob may also be damaged if exposed to salt water or water. The rubber seals on the electronic chip could be penetrated by water, especially when it is submerged for an extended period of time, like in a pool or at the beach. The chip can stop working and may require replacement of the keyfob. If you have a programmable key you can clean the chip with isopropyl alcohol or an electronic cleaner to help it get back to its original functionality. If this doesn’t work the chip, it’s likely fried and will need to be replaced.

Locking/Unlocking of 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. This locks and unlocks doors. If the door lock isn’t working, the problem could be a solenoid malfunction that requires investigation with the help of an expert auto repair shop.

A dead 12 volt could also prevent the fob from functioning properly. This could happen if the battery loses its charge or if your contacts become damaged. This issue can be solved in just a few minutes by purchasing a new battery.

The receiver module could be the cause of the issue if the key fob isn’t working after you replace the battery or re-program the device. This device interprets radio frequency signals received by the key fob to control the vehicle. It could be a costly repair if it becomes faulty.

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 two times in 10 seconds, without taking it out. The Mazda 3 system will now connect the key to the car and you can use it as your primary remote for driving. You can program up to three keys in this way.