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Changing the Battery in Your Mazda 3 Key Fob
There is nothing more frustrating than getting to your car after a long day, and discovering that your key fob battery is dead. This is a simple fix that is easily done at a big box retailer or hardware store.
A spare key fob for your Mazda 3 is an inexpensive method to avoid having to take your vehicle to a dealership in order 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 goes out of service, or if the key fob displays a message on the multi-information display stating, "Low key fob battery. Replace battery."
To open the key fob case you'll need a tape-wrapped flathead screwdriver and a bit of patience. Find a gap or notch in the bottom part of the metal of the Mazda 3's key fob and then insert the head of the screwdriver to pry off the lower half. Repeat this procedure 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 case has been open, you'll be able to see an opening on either side of the case, which houses the battery. Use the flathead screwdriver with tape to gently the case open, starting on one side and then shifting to the other. Remove the old CR2025 and replace it with a new one, ensuring that you put it on its face to ensure the correct direction of polarity. Finally, put the battery cap back on and reattach both sides of the key fob case, pressing until you can hear them click.
Once you've replaced your battery Test the fob to verify that it functions by locking and unlocking your doors. If everything looks good you're now able to use your Mazda 3's remote capabilities on the road again!
Pairing Issues
If your key fob has stopped suddenly it could be a sign that the transmitter in the car has been damaged. This is usually a matter for a professional, and you will require a new key fob.
If you've tried replacing the battery and reprogram the key fob, but it's not working the chip inside the key fob may be faulty. This can occur if the key fob was dropped on hard surfaces or exposed to saltwater, or even touched by dirty hands.
You'll need to locate the tiny "key", which is built into the seam, in order to remove the circuit board and determine the problem. Then, you can examine the electronic chip for corrosion or damage. To avoid damaging the microchip, it is recommended to use a clean paper towel.
mazda 3 key replacement is also possible to examine the battery connector's terminals and determine if they're cracked or broken. If this is the situation then resoldering the terminals into place can usually bring back functionality to the key fob. You can also examine the buttons for damage or wear. If the buttons are loose, they can easily be soldered back in the event that the button is physically snapped off.
Interference Signals
There is nothing more frustrating than looking at a "No Fob Detected" message when trying to start your vehicle. It can happen at the most unfavorable possible times, like when you're late to work or have to pick up your children from daycare or school. There are some things you could do to troubleshoot and find out the root of the issue.
Interference signals can interfere with the remote key fob's signal from the vehicle which causes it to not work correctly. This can be caused by things like weather conditions, buildings and transmitters using the same frequency. Interference can also occur if you install aftermarket equipment in the vehicle that transmits on the same frequency as the key fob.
The key fob can also be damaged if exposed to salt water or water. The rubber seals on the electronic chip may be shattered by water, especially if it is submerged for an extended period of time such as in a pool or at the beach. This can cause the chip to stop functioning and require replacement of the key fob. If you have a programable key it is possible to clean the chip with isopropyl alcohol or an electronic cleaner to aid in its come back to normal. If this does not help the chip, it's likely fried and will need to be replaced.
Locking or 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 your door lock fails to work it could be due to an issue with the solenoid. This requires expert auto repair shops to investigate.
A dead 12 volt battery could cause the fob to stop functioning correctly. This can occur if your battery has lost its charge or if the contacts become corrosion-prone. The problem can be addressed within a few minutes using a new battery.
If the key fob won't work after you change the battery or reprogram it then the problem may be with the receiver module. This device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle. If it malfunctions, it can be expensive to fix.
To determine if this is the case, start by inserting your spare keys into the key slot and turning the ignition to ON. Press the key fob two times in 10 seconds, without taking it out. The Mazda 3 system synchronizes the key with the vehicle, so you can now use it as your primary remote for driving. You can program up to three keys in this manner.