Changing the Battery in Your Mazda 3 Key Fob

It's frustrating to get in your car at the end of a long day and discover that your key fob is dead. Fortunately, this is simple to fix it with the simple replacement of a battery at an electronics store or big box retailer.

A spare key fob for Mazda 3 key fob your Mazda 3 is an inexpensive method to avoid having to take your vehicle to a dealer to have them reprogram the keys.

Battery Replacement

Change the battery in your Mazda 3 key fob is a simple process that you can do at home. You should only replace it if the battery is dead or you see a message saying "Low keyfob battery" on the multi-information display. Replace battery."

To open the case of your key fob you'll need a tape-wrapped flathead screwdriver and some patience. The flathead screwdriver's tip in a notch, or gap in the bottom part of the Mazda 3 key fob to pry the lower half off. Repeat the process for the top piece of metal, but be sure not to scratch the rubber ring at the bottom of the case.

Once the fob case has been open, you'll find the slots on either side of the case that houses the battery. Use the tape-wrapped flathead screwdriver to gently pry the case open, starting on one side and then moving to the opposite. Take out the old CR2025 and replace it with a brand new one, making sure that you place it face-up to ensure proper direction of polarity. Finally, put the cap on the battery and then reattach both sides of the key fob case, pressing until you can hear them click.

After replacing the battery after replacing the battery, lock and unlock your doors to test whether the fob works. If everything is working you're now able to use your mazda 2 key fob 3's remote features on the road again!

Pairing Issues

This could be a sign that the transmitter in your car has been damaged. It is typically a need for a professional to repair and may require a replacement key fob.

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

To diagnose this issue To determine the cause, you must find a small "key" that is embedded into the fob's seam that lets you open it and take out the circuit board. You will then be able check for any damage or corrosion on the electronic chip. It is recommended to use a clean paper towel to prevent damaging the microchip.

It is also possible to take a close look at the battery connector terminals to check if they're cracked or broken. If this is the case, soldering the terminals back into place can usually restore 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 resoldered into place, unless one has physically snapped.

Interference Signals

There is nothing more frustrating than staring at an "No Fob Detected" message when you attempt to start your car. This usually occurs at the most unpopular moments, such as when you're running late for work or picking up children from school/daycare. There are some things you can try to figure out what's causing the problem.

Interference signals can cause the remote key fob to stop functioning properly. This could be caused by objects such as buildings, weather conditions and transmitters that operate on the same frequency. Interference could also occur if you have an aftermarket device installed in the vehicle that transmits at the same frequency as the key fob.

Additionally, if the key fob is exposed to salt or waters, it could be damaged. The rubber seals on the electronic chip can be damaged by water, especially in the event that it is submerged for an extended period of time like in a pool or ocean at the beach. This can cause the chip to stop working and may require replacement of the key fob. If you have a programable key it is possible to clean the chip using isopropyl alcohol or an electronic cleaner to help it return to working. If this does not work the chip, it's likely to be damaged and will need to be replaced.

Locking and unlocking of the Doors

The key fob's buttons send electronic signals to a solenoid within the car. It converts that signal into a mechanical action that locks and unlocks the doors. If the door lock fails to work, it could be an issue with the solenoid. This will require professional repair shops to analyze.

A dead 12 volt battery can also stop the fob from functioning properly. This could happen if the battery is unable to charge or if the contacts become corroded and stop conducting electricity. The good news is that a new battery is able to fix this problem in just minutes.

If the key fob won't work after you change the battery or program it again the problem could be related to the receiver module. The device receives radio frequency signals from the key fob and interprets them to control the functions of the vehicle. If it breaks down it could cost a lot to fix.

To determine if this is true, put your spare key in the key slot. Then turn the ignition ON. Press the key fob twice within 10 seconds, but 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.