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Changing the Battery in Your Mazda 3 Key Fob

There is nothing more frustrating than getting to your vehicle after a long day and realizing that the key fob battery is dead. Luckily, this is an easy fix with the simple replacement of a battery at the hardware store or big box retailer.

Incorporating a spare key fob to your 2018 mazda 3 key fob programming 3 can be an affordable way to keep yourself from having to be driven to the dealership and having them reprogram your keys.

Battery Replacement

You can replace the battery on your mazda 2 keys 3 keyfob at home. You should only replace it when the battery goes out or if you get a message that reads "Low keyfob battery" on the multi-information display. Replace battery."

To open the key fob case it requires a tape-wrapped flathead screwdriver and some patience. Locate a notch or gap in the bottom part of the metal of the Mazda 3's key fob and then insert the tip of the screwdriver in it to pry off the lower part. Repeat the process for the top metal piece, but be sure not to damage the rubber ring at the bottom of the case.

There's a slot on each side of the fob case, which houses the battery. Start on the other side of the case and gently open it. Remove the old battery, and put in the new CR2025 ensure that it's facing up to ensure proper orientation. Finally, place the cap back on and reattach both sides to the key fob case, pressing until you hear them click.

After replacing the battery, lock and unlock your doors to confirm whether the fob works. If everything looks good you're now able to use your Mazda Extra Key 3's remote features on the road again!

Pairing Issues

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

If you've tried replacing the battery and programming the key fob, but this has not solved the problem it is possible that the chip inside the key fob might be damaged. This can happen if your keyfob was dropped or exposed to saltwater or touched by dirty fingers.

To determine the cause of the issue, you will need to locate a small "key" built into the seam of the fob that allows you to lift it open and take out the circuit board. You will then be able check for any damage or corrosion on the chip. It is recommended to use a clean, dry paper towel to ensure that the chip is not damaged.

If you're unsure, you can also check the battery connector's terminals for cracks, or breaks. If this is the case, soldering the terminals back into place can usually restore the functionality of the key fob. It is also possible to check the buttons for wear or damage. If the buttons are loosened, they can be resoldered into position, unless they've physically snapped.

Interference Signals

There are few things more frustrating than gazing at a "No Fob Detected" message when you attempt to start your car. This typically happens at most difficult time, such as when you're running late for work or if you're picking up kids from daycare/school. There are some things you could do to troubleshoot and find out what's causing the issue.

Interference signals can disrupt the remote key fob signal from the vehicle and cause it to not work properly. This could be caused by objects like buildings, weather conditions and transmitters that operate on the same frequency. Interference can also occur when you have an aftermarket device installed in the vehicle that transmits on the same frequency as the key fob.

The key fob can also be damaged if it is exposed to water or salty water. Water can penetrate the rubber seals of the electronic chip, especially when the key fob has been submerged in water for a prolonged period of time. This could cause the chip to cease working and will require replacement of the key fob. If you have a programable key cleaning the chip with isopropyl Alcohol or an electronic cleaner to aid in its come back to normal. If this doesn't work you can be sure that the chip has fried and will need to be replaced.

Locking or Unlocking the Doors

The buttons on the key fob send electronic signals to a solenoid in the car, which converts the signal into a mechanical action that locks and unlocks doors. If the door lock fails to work it could be because of an issue with the solenoid. This will require professional auto repair shops to examine.

A dead battery of 12 volts can cause the fob to stop functioning properly. This can happen when your battery loses its charge or if the contacts become damaged. This issue can be resolved in a matter of minutes by replacing the battery.

If the key fob doesn't work after you change the battery or reprogram it then the problem may be with the receiver module. This device detects radio frequency signals sent by the key fob to control the vehicle. If it fails, it can be expensive to fix.

To test if this is true, place your spare key into the key slot. Then turn the ignition ON. Press the key fob two times for 10 seconds without removing it. The mazda smart key replacement 3 system will now sync the key to the vehicle and you can then use it as your primary remote for driving. This lets you program up to three keys.