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There is nothing more frustrating than stepping into your car after a long day and discovering that the key fob battery is dead. Fortunately, this is an easy fix using simple battery replacement from an hardware store or a big box retailer.

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

Battery Replacement

The battery replacement in the Mazda 3 key fob is an easy procedure that you can perform at home. You should only replace it if the battery goes out or if you get a message that reads "Low keyfob battery" on the multi-information display. Replace battery."

To open the case of your key fob you'll need a tape-wrapped flathead screwdriver and a bit of patience. Put the flathead screwdriver's tip in a notch or gap in the bottom part of the Mazda 3 key fob to remove the lower part. Repeat this step for the top part of the metal however, be careful not to damage the rubber ring on the bottom of the key fob's case.

You'll find a slot on the opposite side of the case that houses the battery. Start on the other side of the case and gently push it open. Remove the old battery, and put in a new CR2025, making sure that it's facing up to ensure proper polarity. Put the cap of the battery on the other side and 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 ensure whether the fob is working. If everything is in order then you can begin using the Mazda 3's remote features to drive again!

Pairing Issues

This could mean that the transmitter in your car has been damaged. This is usually a matter of a professional to repair and will likely require a replacement key fob.

If you've tried replacing the battery and reprogram the key fob, but it's not working, the chip inside the key fob may be defective. This can happen if the keyfob was dropped, exposed to saltwater, or touched by dirty fingers.

You will need to locate the small "key" that is built into the seam, to remove the circuit board and determine the issue. Then, you will be able check for any damage or corrosion on the electronic chip. To avoid damaging the chip, it is recommended to clean the chip with a new paper towel.

If you're not sure you are not sure, you can check the battery connector terminals for cracks, or breaks. If this is the case, then carefully connecting them back will usually restore the function of the key fob. Also, you can check the buttons to see whether they're worn or damaged. If they are loose, they can be resoldered to their original position unless they have physically snapped.

Interference Signals

There is nothing more frustrating than glancing at the "No Fob Detected" message when trying to start your car. This can happen at the most inconvenient situations, like the time you're late to work or have to pick up your children from daycare or school. There are some things you can do to troubleshoot and find out what's the cause.

Interference signals can disrupt the remote key fob's signal to the vehicle and cause it to not work correctly. It can be caused by objects such as weather conditions, buildings and transmitters using the same frequency. Interference can occur if your vehicle has aftermarket equipment that transmits at the same frequency as your key fob.

The key fob might be damaged if exposed to water or salty water. The rubber seals on the chip's electronic components can be penetrated by water, especially if it is submerged for an extended period of time, such as in a pool or ocean at the beach. This can cause the chip to cease working and require replacement of the key fob. If you have a programmeable key it is possible to clean the chip using isopropyl alcohol or an electronic cleaner to help it come back to normal. If this doesn't help, the chip is likely to be damaged and will need to be replaced.

Locking and Unlocking the Doors

The buttons on the fob's key send electronic signals to the solenoid of the car, which then converts this signal into mechanical action. It locks and unlocks doors. If your door lock isn't working it could be due to an issue with the solenoid. This requires expert repair shops to look into.

A dead 12 volt battery can cause the fob to stop functioning correctly. This is the case if the battery loses its charge or if the contactors get corroded and stop transferring electricity. This issue can be solved in a matter of minutes by replacing the battery.

The receiver module could be the reason why the key fob does not function after you replace the battery or program the device. The device receives radio frequency signals from the key fob and interprets them to control the functions of the vehicle. It can be expensive to repair if it malfunctions.

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 button twice within 10 seconds without removing it. The Mazda 3 system synchronizes the key to the vehicle, and you can now use it as your primary remote for driving. This lets you program up to three keys.