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Changing the Battery in Your Mazda 3 Key Fob

There's nothing more annoying than getting in your car after a long work day and finding that the key fob battery is dead. This is a simple fix that can be done at a big box retailer or hardware store.

Adding a spare key fob to your Mazda 3 can be an inexpensive way to save yourself from the hassle of being transported to a dealership and having them re-program your keys.

Battery Replacement

You can change the battery on your mazda spare key cost [Related Home Page] 3 keyfob at home. It is recommended to replace it when the battery goes out or if you see a message saying "Low keyfob battery" on the multi-information display. Replace battery."

You'll need a flathead screwdriver and tape and patience to open the case. The flathead screwdriver's head in a notch, or gap in the bottom part of the Mazda 3 key fob to cut off the lower half. Repeat the procedure for the top piece of metal however, be careful not to damage the rubber ring at the bottom of the case.

Once the fob case is opened, you'll notice the slots on either side of the case, which houses the battery. Use the flathead screwdriver with tape to gently open the case, starting on one side before moving to the opposite. Remove the old CR2025 and replace it with a brand new mazda key fob one, making sure that you put it on its face to ensure proper the polarity. Attach the cap to the battery again, and then attach both sides of your key fob case by pressing until they click.

After replacing the battery Test the fob to make sure it is working by locking and unlocking your doors. If everything seems to be in good order then your Mazda 3 remote features can be used again.

Pairing Issues

If your key fob has stopped functioning suddenly, this could indicate that the transmitter inside your car is damaged. It is typically a need for a professional to repair and will likely require a new replacement key fob.

If you've tried replacing the battery and reprogramme the key fob but it hasn't worked, the chip inside the key fob might be defective. This can happen if the keyfob has been dropped, exposed to saltwater, or the touch of dirty fingers.

To identify the issue, you will need to find a small "key" embedded in the seam of the fob which allows you to take it apart and take out the circuit board. You will then be able to check for any corrosion or damage on the chip. It is recommended to use a clean towel to keep the microchip from being damaged.

If you aren't sure it is possible to check the battery connector's terminals for cracks or breaks. 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 into place and also if a button has physically snapped off.

Interference Signals

There's nothing more frustrating than trying to get the engine started in your vehicle and getting the message "No Fob Detected". It happens at the worst time, for instance the time you're late to work or pick up your children from school/daycare. There are a few things you can do to help figure out what's the cause.

Interference signals can cause the remote key fob to stop working in a proper manner. This can be caused from objects such as weather conditions, buildings and transmitters operating on the same frequency. Interference may also occur if you have an aftermarket device installed in your vehicle that transmits on the same frequency as the key fob.

Additionally, if the key fob is exposed to water or salt water it may be damaged. Water can damage the rubber seals of the electronic chip particularly if the key fob is submerged in water for an extended time. This can cause the chip to stop functioning, requiring replacement of the key fob. If you have a key that is able to be programmed and cleaned with isopropyl or electronic cleaners to restore its functionality. If this does nothing then it's likely that the chip has been damaged and must be replaced.

Locking and Unlocking the Doors

The buttons on the key fob transmit electronic signals to a solenoid in the car. It then converts that signal into a mechanical action that locks and unlocks doors. If the door lock does not work, it could be an issue with the solenoid. This will require professional auto repair shops to examine.

A dead battery of 12 volts can hinder the fob from functioning properly. This can happen if the battery loses charge or the contacts become corroded, and stop transferring electricity. This issue can be solved in just a few minutes by purchasing a new battery.

The receiver module could be the cause of the issue if the key fob does not function after replacing the battery or reprogram the device. This device interprets radio frequency signals sent by the key fob to control the vehicle. It can be expensive to repair if it becomes faulty.

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 a period of 10 seconds, without taking it out. The Mazda 3 system synchronizes the key to the vehicle and you can now use it as your primary remote for driving. You can program up to three keys this manner.