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Changing the Battery in Your Mazda 3 Key Fob

It's a pain to get in your car at the end of a long workday and find that the key fob is dead. This is a simple fix that is easily done at a major box retailer or at a hardware store.

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

Battery Replacement

The battery replacement in the Mazda 3 key fob is an easy process that can how do i get a replacement mazda 3 key replacement key (check out the post right here) at home. But, it is best to replace the battery if it dies, or if the key fob shows a message on the multi-information display that reads, "Low key fob battery. Replace battery."

You'll need to use an flathead screwdriver along with tape and patience to open the case. The head of the flathead screwdriver in a notch, or gap in the bottom part of the 2016 mazda 3 key fob programming 3 key fob to remove the lower part. Repeat the procedure for the top metal piece, but be sure not to damage the rubber ring that is on the bottom of the case.

There's a slot both sides of the fob case, which houses the battery. Start on the opposite side of the case and then gently pry it open. Take out the old CR2025 and replace it with a brand new one, making sure that you put it on its face to ensure the correct the polarity. Put the cap of the battery on again, and then attach both sides of your key fob case by pressing until they click.

After replacing the battery, lock and unlock your doors to verify whether the fob works. If everything is in order then you're able to use your Mazda 3's remote features in the road!

Pairing Issues

If your key fob stops working all of a sudden it could be a sign that the transmitter inside your car has been damaged. It's usually a task for a professional and you will require a brand new key fob.

If you've attempted to replace the battery and reprogramme the key fob but it hasn't worked the chip inside the key fob might be faulty. This could happen if the keyfob was dropped, exposed to saltwater, or was touched by dirty fingers.

You'll need to locate an extremely small "key" that is built into the seam, in order to remove the circuit board to identify the problem. Then, you will be able check for any corrosion or damage on the electronic chip. It is recommended to use a clean towel to prevent damaging the microchip.

If you're unsure, you can also check the battery connector's terminals for cracks or breakage. If this is the case, carefully connecting them back will usually restore the function of 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 into position, unless they've physically snapped.

Interference Signals

There are few things more frustrating than staring at an "No Fob Detected" message when trying to start your car. This happens at the worst occasions, such as when you're late to work or when you have to pick up your children from daycare or school. There are several things you can try to figure out what's causing the problem.

Interference signals can cause the remote key fob not to function properly. This can be caused by things like buildings, weather conditions, and transmitters that use the same frequency. Interference could also occur if you have aftermarket equipment installed in the vehicle that transmits at the same frequency as the key fob.

In addition, if the key fob is exposed to salt or waters, it could be damaged. Water can get into the rubber seals of the electronic chip especially in the event that the key fob is submerged in water for a prolonged duration. The chip may stop working and may require replacement of the keyfob. If you have a programable key it is possible to clean the chip using isopropyl alcohol or an electronic cleaner to aid in its return to working. If this doesn't help, it is likely that the chip is fried and requires replacement.

Locking or Unlocking the Doors

The buttons on the keys send electronic signals to the solenoid inside the car that then transforms the signal into a mechanical action that locks and unlocks the doors. If your door lock isn't working, it could be an issue with the solenoid. This will require experts from auto repair shops to investigate.

A dead battery of 12 volts can also stop the fob from functioning correctly. This could happen if your battery fails to charge or if your contacts get corroded. This issue can be solved in a matter of minutes by replacing the battery.

If the key fob isn't functioning after changing the battery or try to reprogram it, the issue might be in the receiver module. The device detects radio frequency signals sent by the key fob to control the vehicle. It can be a costly repair if the device becomes defective.

To confirm if this true, insert your spare key into the key slot. Then, turn the ignition on. Press the key fob twice within 10 seconds, but without taking it out. The Mazda 3 system will now sync the key to the car and you can use it as your primary remote for driving. You can program up to three keys in this way.