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Changing the Battery in Your Mazda 3 Key Fob
It is frustrating to get in your car at the conclusion of a long and tiring day and discover that your key fob is dead. Fortunately, it is simple to fix it with a simple battery replacement from an hardware store or a big box retailer.
The addition of a spare key fob to your Mazda 3 can be an affordable solution to free yourself from the hassle of being taken to the dealer and having them re-program your keys.
Battery Replacement
Changing the battery in your Mazda 3 key fob is an easy task that you can do at home. It is recommended to replace it if the battery dies or if you see a message reading "Low keyfob battery" on the multi-information display. Replace battery."
You'll need a flathead screwdriver and tape and patience to open the case. Put the flathead screwdriver's head in a notch or gap, on the bottom metal of the Mazda 3 key fob to cut off the lower half. Repeat this step for the top metal piece but be careful not to scratch the rubber ring that is at the bottom of the key fob's case.
Once the fob's case is open, you'll see the slot on either side of the case that houses the battery. Use the flathead screwdriver with tape to gently open the case, beginning on one side and then shifting to the other. Take out the old CR2025 and replace it with a brand new one, making sure that you put it on its face to ensure proper polarity. Install the cap on 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, test the fob to verify that it's working by locking and unlocking your doors. If everything is in order the Mazda 3 remote features can be used again.
Pairing Issues
This could mean that the transmitter in your car may have been damaged. This typically requires the assistance of a professional for repair and will likely require a new replacement key fob.
If you've tried replacing the battery and reprogram the key fob but it hasn't worked the chip inside the key fob could be defective. This could happen if the key fob was dropped on hard surfaces and exposed to salt water or even touched by dirty hands.
To determine the cause of the issue, you will need to find a small "key" built into the seam of the fob that lets you open it up and remove the circuit board. Then, you will be able check for any corrosion or damage on the chip. It is best to use a clean towel to keep the microchip from being damaged.
It is also possible to examine the battery connector's terminals to examine if they're damaged or cracked. If this is the situation it is possible to solder the terminals back to their original position will usually restore the functionality of the key fob. You can also check the buttons for wear or damage. If mazda 3 car key are loose, they can be resoldered into position, unless they've physically snapped.
Interference Signals
Few things are more annoying than staring at an "No Fob Detected" message when trying to start your vehicle. This can happen at the most inconvenient time, for instance when you're late to work or when you have to pick up your children from daycare/school. The good thing is that there are steps you can take to troubleshoot the issue and determine the cause.
Interference signals can interfere with the remote key fob's signal to the vehicle and cause it to not function properly. This could be caused by things such as buildings, weather conditions, and transmitters that operate on 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 exposed to salt water or water. Water can penetrate the rubber seals of the electronic chip, particularly when the key fob is submerged in water for a prolonged period of time. The chip may cease to function and require replacement of the keyfob. If you have a key that can be programmed and cleaned using electronic cleaners or isopropyl to restore its functionality. If this doesn't help, the chip is likely to be damaged and will need to be replaced.
Locking and Unlocking of Doors
The buttons on the key fob send electronic signals to a solenoid within the car that then transforms the signal into a mechanical action that locks and unlocks the doors. If your door lock does not work it could be because of an issue with the solenoid. This will require professionals from repair shops to look into.
A dead 12V battery can also stop the fob from working properly. This could happen if your battery fails to charge or if your contacts become damaged. This issue can be solved within a few minutes using a new battery.
The receiver module may be the problem if the key fob won't work after you replace batteries or reprogram the device. The device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle. It could be a costly repair if it becomes faulty.
To check whether this is the case, start by inserting your spare keys into the key slot and turning the ignition to ON. Press the key fob button three times within 10 seconds without removing it. The Mazda 3 system will now sync the key to the vehicle and you can then use it as your primary remote for driving. This lets you program up three keys.