Changing the Battery in Your Mazda 3 Key Fob
There's nothing more frustrating than stepping into your car after a long day and finding that the key fob battery is dead. Fortunately, this is an easy fix with a simple battery replacement from an electronics store or big box retailer.
A spare key fob for your Mazda 3 is an inexpensive method to avoid having to take your vehicle to a dealer to have them re-program your keys.
Battery Replacement
You can replace the battery on your Mazda 3 keyfob at home. But, it is best to replace the battery if it dies, or if the key fob displays a message on the multi-information display stating, "Low key fob battery. Replace battery."
You'll need a flathead screwdriver, tape and patience to open the case. Insert the flathead screwdriver's head in a notch or gap, on the bottom metal of the Mazda 3 key fob to pry the lower half off. Repeat the procedure for the top piece of metal Be careful not to damage the rubber ring that is on the bottom of the case.
Once the fob case has been opened, you'll notice an opening on either side of the case, which houses the battery. Start on one side of the case, and then gently lift it up. Take out the old CR2025 and replace it with a new one, making sure to put it on its face to ensure the correct direction of polarity. Put the cap of the battery on 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 make sure it is working by locking and unlocking your doors. If everything looks good then you're able to use the Mazda 3's remote features in the road!
Pairing Issues
If your key fob stops functioning suddenly it could be a sign that the transmitter inside your car is damaged. This is usually a matter to a professional and you require a new key fob.
If you have tried replacing the battery and programming the key fob, but did not resolve the issue, it is possible that the chip in the key fob could be malfunctioning. This can happen if your keyfob has been dropped, exposed to saltwater, or the touch of dirty fingers.
You'll need an extremely small "key", which is built into the seam, to remove the circuit board to identify the problem. Then, you will be able to check for any damage or corrosion on the electronic chip. It is best to use a clean towel to keep the microchip from being damaged.
You can also take a close look at the battery connector's terminals to determine if they're damaged or cracked. If this is the case, then carefully reconnecting them will usually restore the function of the key fob. You can also check the buttons for wear or damage. If the buttons are loose, they can easily be soldered back in place in the event that the button has actually snapped off.
Interference Signals
Few things are more frustrating than staring at the "No Fob Detected" message when trying to start your vehicle. It happens at the worst time, for instance when you're running late to work or you're trying to collect your children from daycare/school. The good news is that there are a few steps you can take to pinpoint the issue and figure out the root of the problem.
Interference signals can cause the remote key fob to stop functioning in a proper manner. This can be caused from things like weather conditions, buildings and transmitters using the same frequency. Interference could 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. The rubber seals on the electronic chip may be penetrated by water, particularly if it is submerged for long periods of time such as in a swimming pool or at the beach. The chip may stop working and require replacement of the keyfob. If you have a key which can be programmed or programmed, you can clean it using electronic cleaners or isopropyl to restore its functionality. If this does nothing then it's likely that the chip is fried and will need to be replaced.
Locking/unlocking the Doors
The key fob's buttons send electronic signals to a solenoid within the car. It converts the signal into a mechanical action that locks and unlocks the doors. If the door lock isn't functioning, the issue could be a solenoid malfunction that requires investigation with the assistance of an expert auto repair shop.
A dead 12 volt battery can also prevent the fob from functioning properly. This could happen if your battery loses its charge or if your contacts become corroded. The good news is that a new battery can fix this problem in just minutes.
If mazda 3 key fob isn't functioning after you replace the battery or try to reprogram it the issue could be in the receiver module. The device interprets radio frequency signals received by the key fob to control the vehicle. It could be expensive to repair if it malfunctions.
To determine if this is true, place your spare key into the key slot. Then, turn the ignition on. Press the key fob two times in 10 seconds, without removing it. The Mazda 3 system synchronizes the key with the vehicle, so you can use it as your primary remote for driving. You can program up to three keys in this way.