"The Ultimate Cheat Sheet" On 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 discovering that the key fob battery is dead. This is a straightforward fix that can be found at a major box retailer or hardware store.

A spare key fob for your Mazda 3 is an inexpensive option to not have to take your vehicle to a dealer to have them re-program your keys.

Battery Replacement

The battery replacement in your Mazda 3 key fob is a simple process that you can do at home. You should only replace it if the battery dies or if you see a message saying "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. Find a gap or notch in the bottom portion of the metal of your Mazda 3's key fob and then insert the tip of the screwdriver in it to break off the lower part. Repeat the process for the top piece of metal but be careful not to damage the rubber ring on the bottom of the case.

Once the fob case has been open, you'll be able to see the slots on either side of the case that houses the battery. Use the flathead screwdriver with tape to gently open the case, starting on one side and then moving to the opposite. Remove the old battery, and put in the new CR2025 ensure that it's face-up for proper orientation. Finally, put the cap of the battery back on and reconnect both sides of the key fob case, pressing until you hear them click.

After you've replaced the battery Test the fob to verify that it works by locking and unlocking your doors. If everything is in order then you're able to use your Mazda 3's remote capabilities in the road!

Pairing Issues


If your key fob has stopped working suddenly, this could indicate that the transmitter in the car is damaged. This usually requires the assistance of a professional for repair and may require a replacement key fob.

If you've tried replacing the battery and reprogramming the key fob, but did not resolve the issue it is possible that the chip in the key fob could be defective. This could happen if the key fob has been dropped on hard surfaces, exposed to salt water or even brushed by dirty hands.

You'll need the tiny "key" that is built into the seam, to remove the circuit board to identify the issue. You will then be able to look for any corrosion or damage on the electronic chip. It is best to use a clean towel to ensure that the chip is not damaged.

You may also examine the battery connector's terminals and see if they are cracked or broken. If this is the case, then carefully attaching them back can often restore the function of the key fob. It is also possible to check the buttons for damage or wear. If the buttons are loose, they can be soldered back into place regardless of whether the button has actually snapped off.

Interference Signals

There are few things more frustrating than trying to start your car and then seeing the message "No Fob Detected". This happens at the worst situations, like when you're late for work or have to pick up your children from school/daycare. The good thing 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 signal coming from the vehicle making it unable to work properly. This could be caused by things such as buildings, weather conditions, 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 could be damaged if it is exposed to water or salty water. Water can get into the rubber seals of the electronic chip especially when the key fob has been submerged in water for an extended period of time. This could cause the chip to stop working, requiring replacement of the key fob. If you have a programmeable key you can clean the chip using isopropyl alcohol or an electronic cleaner to help it return to working. If this doesn't help, the chip is likely to be damaged and will need to be replaced.

Locking and Unlocking the Doors

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

A dead 12 volt battery could also stop the fob from functioning properly. This can happen when your battery fails to charge or if your contacts get corrosion-prone. The good news is that a new battery is able to resolve this issue in a matter of minutes.

The receiver module may be the cause if the key fob does not function after you replace batteries or reprogram the device. This device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle. If it malfunctions it could cost a lot 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 10 seconds, without taking it out. The Mazda 3 system will now be able to synchronize the key with your car and you can use it as your primary remote for driving. mazda bt50 key replacement allows you to program up three keys.