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Changing the Battery in Your Mazda 3 Key Fob

It can be a bit frustrating to drive off at the end of a long, hard day and discover that your key fob is dead. Luckily, this is simple to fix it with an easy battery replacement at a hardware store or big box retailer.

A spare key fob for your mazda keys 3 is an inexpensive alternative to not having to be towed to a dealer to have them re-program your keys.

Battery Replacement

Change the battery in your Mazda 3 key fob is an easy procedure that you can perform at home. You should only replace it when the battery goes out or if you notice a message stating "Low keyfob battery" on the multi-information display. Replace battery."

To open the key fob's casing, you'll need a tape-wrapped flathead screwdriver and a bit of patience. Locate a notch or gap in the bottom metal part of your mazda 3 keyless entry 3's key fob, and then insert the tip of the screwdriver to cut off the lower portion. Repeat this process for the top metal part but be careful not to scratch the rubber ring at the bottom of the key fob's case.

There's a slot the opposite side of the case that contains the battery. Start on one side of the case, and then gently open it. Take out the old CR2025 and replace it with a brand new one, making sure you place it face-up to ensure the correct the polarity. Finally, put the cap of the battery back on and then reattach both sides of the key fob's case. Continue pressing until you can hear them click.

Now that you've replaced the battery, test the fob to ensure it functions by locking and unlocking your doors. If everything looks good then you're able to use your Mazda 5 Replacement Key 3's remote capabilities in the road!

Pairing Issues

If your key fob stopped working suddenly it could mean that the transmitter in the car has been damaged. This usually requires a professional to repair and will likely require a new key fob.

If you've tried to change 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 keyfob has been dropped, exposed to saltwater, or the touch of dirty fingers.

To identify the issue it is necessary to locate a small "key" embedded in the fob's seam that lets you open it and remove the circuit board. Then, you can check the electronic chip for damage or corrosion. To prevent damaging the chip, it is recommended to use a clean paper towel.

You can also inspect the battery connector terminals to see if they are cracked or broken. If this is the case it is possible to solder the terminals back into place can usually restore functionality to the key fob. You can also examine the buttons for damage or wear. If they are loose, they can be resoldered into place unless one has physically snapped.

Interference Signals

There's nothing more frustrating than trying to start your vehicle and getting the message "No Fob Detected". This happens at the worst situations, like when you're late for work or when you have to pick up your children from school/daycare. The good news is that there are steps you can take to investigate the issue and figure out what is causing it.

Interference signals can cause the remote key fob not to function properly. It can be caused by objects such as weather conditions, buildings, and transmitters operating on the same frequency. Interference could occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob.

The key fob can also be damaged if it is exposed to salt water or water. The rubber seals on the chip's electronic components can be damaged by water, particularly when it is submerged over an extended period of time, such as in a pool or at the beach. The chip could stop working and may require replacement of the keyfob. If you have a key which can be programmed to work, you can clean it with isopropyl or electronic cleaners to restore its functionality. If this does not help the chip, it is likely to be damaged and needs to be replaced.

Locking/Unlocking the Doors

The buttons on the fob's key send electronic signals to the solenoid in the car, which transforms the signal into mechanical action. This locks and unlocks doors. If your door lock fails to work, it could be an issue with the solenoid. This requires professionals from auto repair shops to examine.

A dead 12 volt battery can hinder the fob from functioning correctly. This is the case if the battery is unable to charge or if the contacts get corroded and stop transferring electricity. The good news is that a new battery is able to resolve this issue in a matter of minutes.

If the key fob won't work after you change the battery or reprogram it the issue could be related to the receiver module. This device detects 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 the case, begin by putting your spare key into the key slot and turning the ignition to ON. Press the key fob button twice within 10 seconds, without removing it. The Mazda 3 system will now connect the key to the car and allow you to use it as your primary remote for driving. This allows you to program up three keys.