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Changing the Battery in Your Mazda 3 Key Fob
It is frustrating to get into your car at the end of a long workday and discover that your key fob is dead. This is a straightforward fix that can be done at a big box retailer or at a hardware store.
A spare key fob for your Mazda 3 is an inexpensive alternative to not having to be towed to a dealer to have them re-program your keys.
Battery Replacement
Removing the battery from the Mazda 3 key fob is an easy process that can perform at home. But, you should only replace the battery when it fails, or when the key fob displays a message in the multi-information display stating, "Low key fob battery. Replace battery."
To open the key fob's casing you'll need a tape-wrapped flathead screwdriver as well as some patience. Place the head of the flathead screwdriver into a notch, or gap on the bottom metal of the Mazda 3 key fob to take off the lower portion. 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 is open, you'll see the slots on either side of the case that houses the battery. Make use of the tape-wrapped flathead screwdriver to gently pry open the case, starting on one side before shifting to the other. Remove the old CR2025 and replace it with a new one, making sure you put it on its face to ensure the correct polarity. Attach the cap to the battery the other side and attach both sides of your key fob case by pressing until they click.
Now that you've replaced the battery Test the fob to make sure it's working by locking and unlocking your doors. If mazda replacement keys is working, you can start using the Mazda 3's remote functions for the first time!
Pairing Issues
This could indicate that the transmitter in your car has been damaged. It's usually a task to a professional and you require a new key fob.
If you've attempted to replace the battery and reprogram the key fob but it hasn't worked the chip inside the key fob could be defective. This can happen if your keyfob was dropped or exposed to saltwater or touched by dirty fingers.
You'll need to locate an extremely small "key" that is inserted into the seam, in order to remove the circuit board and determine the problem. You can then check the chip for corrosion or damage. To avoid damaging the chip, it is recommended to use a clean paper towel.
If you're not sure, you can also check the battery connector terminals for cracks or breaks. If this is the case, then carefully soldering them back in place will usually restore the function of the key fob. Similarly, you can inspect the buttons to see if they are worn or damaged. If the buttons are loose, they can be soldered back to their original position unless they have physically snapped.
Interference Signals
There are few things more frustrating than gazing at a "No Fob Detected" message when trying to start your car. It can happen at the most unfavorable time, for instance when you're running late to work or have to pick up your children from school/daycare. The good thing is that there are steps you can take to investigate the issue and determine what is causing it.
Interference signals can affect the remote key fob's signal from the vehicle making it unable to function correctly. This could be due to objects such as weather conditions, buildings and transmitters that operate on the same frequency. Interference can occur when your vehicle has aftermarket equipment that transmits at the same frequency as your key fob.
The key fob could be damaged if it is exposed to salt water or water. The rubber seals on the electronic chip can be shattered by water, especially when it is submerged over an extended period of time, such as in a swimming pool or at the beach. The chip may cease to function and may require replacement of the keyfob. If you have a key that can be programmed, you can clean it using isopropyl or electronic cleaners to restore its function. If this does not work the chip, it is likely fried and will need to be replaced.
Locking/Unlocking the Doors
The buttons on the key fob transmit electronic signals to the solenoid of the car, which transforms this signal into a mechanical action. This locks and unlocks doors. If your door lock doesn't work it could be due to an issue with the solenoid. This will require experts from auto repair shops to examine.
A dead 12 volt battery could cause the fob to stop functioning effectively. This can occur if your battery is not charged or if the contacts are damaged. This problem can be fixed in minutes with a new battery.
If the key fob won't work after you have changed the battery or try to program it again, the issue might be related to the receiver module. This device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle. It can be expensive to repair if it is damaged.
To determine whether this is the case, begin by inserting your spare key into the key slot and setting the ignition to ON. Press the key fob button three times in a matter of 10 seconds without removing it. The Mazda 3 system will now connect the key to the vehicle and you can then use it as your primary remote for driving. You can program up to three keys this way.