The 10 Most Scariest Things About Mazda 6 Key Fob Changing the Battery in Your Mazda 3 Key Fob

There is nothing more frustrating than getting to your vehicle after a long day and finding that the key fob battery is dead. This is a simple fix that is easily done at a major box retailer or at a hardware store.

A spare key fob for your Mazda 3 is an inexpensive alternative to not having to be towed to a dealership to have them re-program the keys.

Battery Replacement

You can change the battery on your Mazda 3 keyfob 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 to use a flathead screwdriver and tape and patience to open the case. mazda 5 key fob in a notch or gap in the bottom part of the Mazda 3 key fob to take off the lower portion. Repeat this step for the top metal piece but be careful not to damage the rubber ring at bottom of the key fob's case.

You'll find a slot on each side of the fob case, which houses the battery. Use the flathead screwdriver with tape to gently pry open the case, starting on one side and then moving to the opposite. Take out the old CR2025 and replace it with a new one, making sure that you place it face-up to ensure the correct direction of polarity. Attach the cap to the battery again, and then attach both sides of your key fob case by pressing until they click.

Now that you've replaced the battery Check the fob to confirm it works by locking and unlocking your doors. If everything looks good then you're able to use the Mazda 3's remote features for the first time!


Pairing Issues

If your key fob stop suddenly it could be because the transmitter inside your car is damaged. It's usually a job for a professional and you will require a brand new key fob.

If you have tried replacing the battery and programming the key fob, but does not solve the issue it could be that the chip in the key fob could be faulty. This can occur if the key fob was dropped on hard surfaces or exposed to salt water or even touched by dirty hands.

You'll need to find the tiny "key" that is inserted into the seam, in order to remove the circuit board and diagnose the issue. You can then check the chip for damage or corrosion. It is best to use a clean paper towel to prevent damaging the microchip.

If you're not sure you are not sure, you can check the battery connector's terminals for cracks, or breaks. If this is the situation then resoldering the terminals into place can usually bring back functionality to the key fob. Also, you can check the buttons to determine whether they are worn out or damaged. If they are loose, they can be resoldered into place unless one has physically snapped.

Interference Signals

There are few things more frustrating than gazing at an "No Fob Detected" message when trying to start your car. This happens at the worst situations, like when you're running late to work or pick up your children from school or daycare. The good news is that there are steps you can follow to resolve the issue and figure out what is causing it.

Interference signals can disrupt the remote key fob signal coming from the vehicle, causing it to not work properly. This can be caused by objects such as weather conditions, buildings and transmitters operating on the same frequency. Interference may occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob.

Additionally, if the key fob is exposed to salt or water seawater, it may be damaged. Water can penetrate the rubber seals of the electronic chip particularly when the key fob is submerged in water for a long period of time. This can cause the chip to cease working and may 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 aid in its come back to normal. If this doesn't work the chip, it is likely to be damaged and needs to be replaced.

Locking/Unlocking of the Doors

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

A dead 12V battery can also hinder the fob from working properly. This could happen if your battery has lost its charge or if your contacts get damaged. The good news is that a new battery can solve this issue in only minutes.

If the key fob won't work after changing the battery or try to re-program it then the problem may be in the receiver module. The device receives radio frequency signals from the key fob and interprets them to control the vehicle's functions. If it breaks down it could cost a lot to fix.

To test if this is true, insert your spare key in the key slot. Then turn the ignition on. Press the key fob button three times within 10 seconds without removing it. The Mazda 3 system will now synchronize the key with the car and allow you to use it as your primary remote for driving. You can program up to three keys in this manner.