Why You Should Forget About How To Improve Your Mazda 6 Key Fob Changing the Battery in Your Mazda 3 Key Fob

It's frustrating to get in your car at the end of a long day and find that the key fob is dead. Fortunately, it is an easy fix with simple battery replacement from a hardware store or big box retailer.


A spare key fob to your Mazda 3 can be an cost-effective way to stay away from the hassle of being towed to the dealership and having them re-program your keys.

Battery Replacement

Changing the battery in the Mazda 3 key fob is an easy process that can do at home. But, you should only replace the battery if it is dead, or if the key fob shows a message on the multi-information display stating, "Low key fob battery. Replace battery."

To open the case of your key fob, you'll need a tape-wrapped flathead screwdriver and some patience. Put the flathead screwdriver's tip into a notch, or gap, on the bottom metal of the Mazda 3 key fob to cut off the lower half. Repeat this procedure for the top metal part but be careful not to damage the rubber ring that is at the bottom of the key fob's case.

When the fob case is open, you'll find an opening on either side of the case, which houses the battery. Start with replacement mazda 2 key of the case, and then gently lift it up. Remove the old battery, and put in the new CR2025 and make sure it's facing up to ensure proper polarity. Finally, place the cap of the battery back on and reconnect both sides of the key fob's case, pressing until you hear them click.

After replacing the battery After replacing the battery, lock and unlock your doors to confirm that the fob works. If everything looks good then you can begin using the Mazda 3's remote functions on the road again!

Pairing Issues

If your key fob stopped working all of a sudden it could be a sign that the transmitter inside the car has been damaged. It is usually a job for a professional, and you will require a new key fob.

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

To diagnose this issue To determine the cause, you must find a small "key" located in the edge of the fob that allows you to open it up and take out the circuit board. Then, you will be able to check for any damage or corrosion on the chip. It is recommended to use a clean paper towel to ensure that the chip is not damaged.

If you are unsure, you can also check the battery connector's terminals for cracks, or breaks. If this is the case, soldering the terminals back to their original position will usually bring back functionality to the key fob. You can also inspect the buttons for damage or wear. If the buttons are loose, they can be soldered back regardless of whether the button is physically snapped off.

Interference Signals

There are few things more difficult than trying to start your car and seeing the message "No Fob Detected". It typically happens at most unpopular moments, such as the time you're late to work or if you're picking up kids from school/daycare. The good thing is that there are a few steps you can take to troubleshoot the issue and determine what is causing it.

Interference signals can disrupt the remote key fob signal from the vehicle and cause it to not work correctly. This can be caused by objects like buildings, weather conditions, and transmitters that use 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 salt water or water. The rubber seals on the electronic chip can be shattered by water, particularly when it is submerged over long periods of time, such as in a swimming pool or at the beach. The chip could stop working and may require replacement of the keyfob. If you have a programable key cleaning the chip with isopropyl Alcohol or an electronic cleaner to aid in its return to working. If this doesn't work will be able to fix the issue, then the chip has fried and must be replaced.

Locking and Unlocking the Doors

The key fob's buttons send electronic signals to a solenoid within the car, which transforms the signal into a mechanical action that locks and unlocks the doors. If the door lock isn't working, it may be a solenoid issue that requires some investigation with the assistance of a professional auto repair shop.

A dead 12 volt battery could hinder the fob from functioning correctly. This could happen if the battery is not charged or if the contacts become corrosion-prone. This issue can be resolved in minutes with a new battery.

If the key fob doesn't work after you change the battery or try to re-program it then the problem may be in the receiver module. The device interprets radio frequency signals transmitted by the key fob to control the vehicle. If it fails it could be costly to fix.

To test if this is correct, place your spare key into the key slot. Then, turn the ignition ON. Press the key fob twice in a period of 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. You can program up to three keys this manner.