Changing the Battery in Your Mazda 6 Key 3 Key Fob

There's nothing more frustrating than getting in your vehicle after a long work day and discovering that the key fob battery is dead. This is a simple fix that can be done at a major 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 dealer to have them re-program the keys.

Battery Replacement

You can replace the battery on your Mazda 3 keyfob at home. But, you should only replace the battery if it fails, or when the key fob displays a message in the multi-information display that reads, "Low key fob battery. Replace battery."

To open the case of your key fob You'll need a tape wrapped flathead screwdriver as well as some patience. Find a gap or notch in the bottom of the metal part of the Mazda 3's key fob and then insert the tip of the screwdriver into it to pry off the lower half. Repeat this procedure for the top metal part, but be careful not to damage the rubber ring on the bottom of the key fob's case.

There's a slot on each side of the fob case that contains the battery. Start with one side of the case, and then gently lift it up. Take out the old CR2025 and replace it with a new one, ensuring that you put it on its face to ensure proper the polarity. Attach the cap to the battery again and attach both sides of your key fob case by pressing until they click.

After replacing the battery after replacing the battery, lock and unlock your doors to test that the fob works. If everything looks good you're now able to use the Mazda 3's remote features to drive again!

Pairing Issues

If your key fob stop working all of a sudden, this could indicate that the transmitter inside the car has been damaged. This typically requires the assistance of a professional for repair and may require a new key fob.

If you've tried replacing the battery and reprogramming the key fob but isn't solving the issue it is possible the chip inside the key fob could be malfunctioning. This can happen when the key fob was dropped on hard surfaces and exposed to salt water, or even touched by dirty hands.

To diagnose this issue, you will need to locate a tiny "key" that is embedded into the edge of the fob that allows you to open it and remove the circuit board. You will then be able to check for any damage or corrosion on the chip. It is best to use a clean, dry paper towel to keep the microchip from being damaged.

If you're not sure it is possible to check the battery connector's terminals for cracks or breakage. If this is the situation, soldering the terminals back to their place will usually bring back functionality to the key fob. It is also possible to check the buttons for wear or damage. If the buttons are loose, they can be soldered back in place and also if the button is actually snapped off.

Interference Signals

There is nothing more frustrating than staring at a "No Fob Detected" message when trying to start your vehicle. It can happen at the most unfavorable time, for instance when you're late to work or have to pick up your children from school or daycare. The good news is that there are steps you can take to pinpoint the issue and figure out the cause.

Interference signals can cause the remote key fob to stop working in a proper manner. This could be caused by things like weather conditions, buildings, and transmitters that use 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.

In addition, if your key fob is exposed to salt or water seawater, it may be damaged. The water can penetrate the rubber seals of the electronic chip, particularly in the event that the key fob is submerged in water for a long duration. This could cause the chip to cease working and will require replacement of the key fob. If you have a key that has the ability to be programmed, you can clean it with isopropyl or electronic cleaners to bring it back to its original functionality. If this does not help the chip, it is likely to be damaged and will need to be replaced.

Locking/unlocking the Doors

The buttons on the fob's key send electronic signals to the solenoid of the car, which transforms this signal into a mechanical action. It locks and unlocks doors. If the door lock is not functioning, the issue could be due to a solenoid problem that requires some investigation by an expert repair shop for autos.

A dead 12 volt battery could cause the fob to stop working properly. This could happen if the battery's charge is lost or if the contacts get corroded and stop transferring electricity. The problem can be addressed within a few minutes using a new battery.

The receiver module may be the cause if the key fob doesn't work after replacing the battery or re-program the device. This device interprets radio frequency signals received by the key fob to control the vehicle. It can be a costly repair if it malfunctions.

To test if this is true, put your spare key into the key slot. Then turn the ignition on. Press the key fob button twice in a matter of 10 seconds without removing it. The mazda key replacement 3 system synchronizes the key with the vehicle, so you can use it as your primary remote for driving. You can program up to three keys in this way.