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Changing the Battery in Your Mazda 3 Key Fob
There is nothing more frustrating than returning to your car after a long and tiring day and discovering that your key fob battery is dead. Fortunately, this is an easy fix with simple battery replacement from a hardware store or big box retailer.
Adding a spare key fob to your Mazda 3 can be an inexpensive way to save yourself from having to be driven to the dealership and having them reprogram your keys.
Battery Replacement
Removing the battery from the Mazda 3 key fob is a simple process that you can perform at home. However, you should only replace the battery when it goes out of service, or if the key fob shows a message on the multi-information display stating, "Low key fob battery. Replace battery."
To open the key fob's case it requires a tape-wrapped flathead screwdriver as well as some patience. Put the flathead screwdriver's tip into a notch, or gap on the bottom of the metal of the Mazda 3 key fob to pry the lower half off. Repeat mazda replacement key cost for the top metal piece, but be careful not to damage the rubber ring at bottom of the key fob's case.
There's a slot each side of the case that contains the battery. Start on the other side of the case, and then gently lift it up. Remove the old battery and then put in a new CR2025, making sure that it's facing upwards to ensure proper orientation. Place the battery cap on again, and then attach both sides of your key fob case by pressing until they click.
Once you've replaced your battery, test the fob to verify that it works by locking and unlocking your doors. If everything is in order, your Mazda 3 remote features can be used again.
Pairing Issues
This could be a sign that the transmitter in your car is damaged. It's usually a task to a professional and you will require a new key fob.
If you've tried replacing the battery and reprogramming the key fob but does not solve the issue, it is possible that the chip in the key fob could be defective. This could happen if the key fob was dropped on hard surfaces or exposed to saltwater or even brushed by dirty hands.
You'll need to locate the small "key", which is built into the seam, to remove the circuit board to identify the issue. Then, you will be able to examine for any damage or corrosion on the chip. To prevent damaging the chip, it is recommended to use a clean paper towel.
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 case, carefully connecting them back will usually restore the function of the key fob. You can also check the buttons for wear or damage. If they are loose, they can be soldered back into place unless one has physically snapped.
Interference Signals
There are few things more difficult than trying to start your car and then seeing the message "No Fob Detected". This typically happens at most unpopular moments, such as when you are late for work or when you are picking up your children from school/daycare. There are a few things you can do to find out what's the cause.
Interference signals can cause the remote key fob to stop working properly. It can be caused by objects such as weather conditions, buildings, and transmitters using the same frequency. Interference may also occur if you have equipment from an aftermarket manufacturer installed in the vehicle that transmits at the same frequency as the key fob.
In addition, if your key fob is exposed to salt or waters, it could be damaged. Water can get into the rubber seals of the electronic chip particularly if the key fob is submerged in water for a long duration. This could cause the chip to cease working, requiring replacement of the key fob. If you have a programable key cleaning the chip with isopropyl Alcohol or an electronic cleaner to help it return to functionality. If this doesn't help the chip, it is likely to be damaged and will need to be replaced.
Locking/unlocking the Doors
The buttons on the key fob send electronic signals to a solenoid within the car. It converts that signal into a mechanical action that locks and unlocks the doors. If the door lock isn't working, the issue could be a solenoid issue that requires some analysis with the help of an expert auto repair shop.
A dead 12V battery can also prevent the fob from functioning effectively. This is the case if the battery loses charge or the contacts become corroded, and stop transferring electricity. The good news is that a new battery is able to fix this issue in just minutes.
If the key fob isn't functioning after changing the battery or program it again the issue could be with the receiver module. The device receives radio frequency signals from the key fob and interprets them to control the functions of the vehicle. If it fails, it can be expensive to repair.
To confirm if this true, put your spare key in the key slot. Then, turn the ignition on. Press the key fob button three times within 10 seconds without taking it. The Mazda 3 system synchronizes the key to the vehicle, and you can now use it as your primary driving remote. You can program up to three keys this way.