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Changing the Battery in Your Mazda 3 Key Fob

It is frustrating to get in your car at the end of a long day and discover that the key fob is dead. This is a simple fix that can be found at a major box retailer or at a hardware store.

A spare key fob for your mazda 2 replacement key 3 is an inexpensive option to not have to be towed to a dealership to have them re-program your keys.

Battery Replacement

You can change the battery on your mazda smart key 3 keyfob at home. However, you should only replace the battery when it fails, or when the key fob displays a message in the multi-information display, "Low key fob battery. Replace battery."

To open the key fob's casing You'll need a tape wrapped flathead screwdriver, along with some patience. Find a gap or notch in the bottom part of the metal of the mazda key fob 3's key fob, and then insert the tip of the screwdriver in it to remove the lower part. Repeat this step for the top metal part Be careful not to damage the rubber ring at the bottom of the key fob's case.

There's a slot each side of the case, which houses the battery. Use the tape-wrapped flathead screwdriver to gently open the case, starting on one side and then shifting to the other. Remove the old CR2025 and replace it with a new one, making sure you place it face-up to ensure proper orientation. Finally, put the battery cap back on and reconnect both sides of the key fob case, pressing until you hear them click.

After replacing the battery, lock and unlock your doors to ensure whether the fob works. If everything is in order you're good to go. Mazda 3 remote features can be used again.

Pairing Issues

This could be a sign that the transmitter in your car has been damaged. It is usually a job for a professional and you will require a brand new key fob.

If you have tried replacing the battery and reprogramming the key fob, but this did not resolve the issue it is possible that the chip in the key fob is defective. This can occur if the key fob was dropped on hard surfaces or exposed to salt water or even brushed by dirty hands.

To diagnose this issue, you will need to locate a tiny "key" embedded in the edge of the fob which allows you to open it and remove the circuit board. You can then check the chip for damage or corrosion. To avoid damaging the chip, it is recommended to clean the chip with a new paper towel.

It is also possible to examine the battery connector terminals to examine if they're cracked or broken. If this is the situation you can 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 the buttons are loose, they can easily be soldered back as well unless the button is actually snapped off.

Interference Signals

Few things are more frustrating than gazing at an "No Fob Detected" message when trying to start your vehicle. It typically happens at most awkward time, such as the time you're late to work or if you're picking up kids from school/daycare. There are a few things you can try to figure out what's the cause.

Interference signals can disrupt the remote key fob signal from the vehicle making it unable to work correctly. This can be caused by things such as weather conditions, buildings, and transmitters that use the same frequency. Interference can also occur if you have an aftermarket device installed in your vehicle that transmits at the same frequency as the key fob.

The key fob might be damaged if it is exposed to water or salty water. Water can get into the rubber seals of the electronic chip, especially when the key fob is submerged in water for a lengthy time. This could cause the chip's function to cease, requiring replacement of the key fob. If you have a programable key, you can clean the chip with isopropyl Alcohol or an electronic cleaner to help it come back to normal. If this doesn't work the chip, it's likely fried and will need to be replaced.

Locking and Unlocking the Doors

The buttons on the key fob send electronic signals to the solenoid inside the car. It converts the signal into a mechanical action that locks and unlocks doors. If your door lock doesn't work it could be due to an issue with the solenoid. This requires experts from repair shops to analyze.

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

If the key fob isn't working after you change the battery or program it again the problem could be with the receiver module. The device interprets radio frequency signals transmitted by the key fob to control the vehicle. It can be expensive to repair if the device becomes defective.

To test if this is true, place your spare key in the key slot. Then turn the ignition on. Press the key fob two times in 10 seconds, without taking it out. The 2017 Mazda 3 Key Fob Programming 3 system will now synchronize the key with the car and you can use it as your primary remote for driving. This allows you to program up to three keys.