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Changing the Battery in Your Mazda 3 Key Fob

It can be a bit frustrating to pull into your car at the conclusion of a long and tiring day and find that the key fob is dead. Luckily, this is simple to fix it with an easy battery replacement at an hardware store or a big box retailer.

The addition of a spare key fob to your mazda 2 car key 3 can be an affordable way to keep yourself from the hassle of being transported to a dealership and having them reprogram your keys.

Battery Replacement

You can replace the battery on your Mazda 3 keyfob at home. However, you should replace the battery when it goes out of service, or if the key fob shows a message on the multi-information display that reads, "Low key fob battery. Replace battery."

You'll need an flathead screwdriver along with tape and patience to open the case. Locate a notch or gap in the bottom portion of the metal of your Mazda 3's key fob and then insert the head of the screwdriver into it to cut off the lower part. Repeat the process for the top metal part, but be careful not to damage the rubber ring at the bottom of the key fob's case.

Once the fob's case is opened, you'll notice a slot on either side of the case, which houses the battery. Make use of the tape-wrapped flathead screwdriver to gently pry open the case, beginning with one side and moving to the opposite. Take out the old CR2025 and replace it with a new one, making sure to put it on its face to ensure proper the polarity. Finally, put the cap of the battery back on and reattach both sides of the key fob's case, pressing until you hear them click.

After replacing the battery after replacing the battery, lock and unlock your doors to test whether the fob is working. If everything looks good then you can begin using the Mazda 3 Keys 3's remote features in the road!

Pairing Issues

If your key fob stopped working all of a sudden it could mean that the transmitter inside the car has been damaged. This is usually a matter to a professional and you will require a brand new key fob.

If you've tried to replace the battery and reprogramme the key fob but it's not working, the chip inside the key fob might be faulty. This could happen if the key fob was dropped on hard surfaces and exposed to salt water, or even touched by dirty hands.

You'll need an extremely small "key", which is inserted into the seam to remove the circuit board and diagnose the problem. You will then be able check for any corrosion or damage on the chip. To avoid damaging the chip, it is best to use a fresh paper towel.

You can also examine the battery connector's terminals to examine if they're damaged or cracked. If this is the case, then carefully attaching them back can often restore the function of the key fob. Also, you can check the buttons to determine whether they are worn out or damaged. If the buttons are loose, they can be soldered back into place unless one has physically snapped.

Interference Signals

There is nothing more frustrating than glancing at the "No Fob Detected" message when you attempt to start your vehicle. This can happen at the most inconvenient time, for instance when you're late for work or have to pick up your children from daycare or school. The good news is that there are a few steps you can take to troubleshoot the issue and determine the root of the problem.

Interference signals can disrupt the remote key fob signal coming from the vehicle, causing it to not work properly. This could be caused by objects such as buildings, weather conditions and transmitters that use the same frequency. Interference can occur when your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob.

In addition, if your key fob is exposed to salt or water it may be damaged. The rubber seals on the electronic chip can be penetrated by water, particularly when it is submerged over an extended period of time, like in a pool or at the beach. The chip can stop working and may require replacement of the keyfob. If you have a programmeable key, you can clean the chip using isopropyl alcohol or an electronic cleaner to help it come back to normal. If this doesn't work, the chip 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 the signal into mechanical action. It locks and unlocks doors. If the door lock isn't working, it may be a solenoid issue that requires investigation by an expert repair shop for autos.

A dead 12 volt battery can also stop the fob from functioning properly. This can happen when your battery has lost its charge or if the contacts become corrosion-prone. The good news is that a new battery is able to fix this problem in just minutes.

If the key fob isn't functioning after you replace the battery or program it again then the problem may be in the receiver module. The device receives radio frequency signals from the key fob and interprets them to control the vehicle's functions. It could be a costly repair if it is damaged.

To determine if this is the case, begin by inserting the spare key into the key slot and turning the ignition to ON. Press the key fob button two times within 10 seconds, without removing it. The Mazda 3 system synchronizes the key with the vehicle and you can now use it as your primary driving remote. This allows you to program up to three keys.