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Changing the Battery in Your Mazda 3 Key Fob
There is nothing more frustrating than returning to your car after a long day, and discovering that your key fob battery is dead. This is a simple fix that can be done at a big box retailer or hardware store.
The addition of a spare key fob to your Mazda 3 can be an affordable solution to free yourself from having to be towed to the dealership and having them re-program your keys.
Battery Replacement
You can change the battery on your Mazda 3 keyfob at home. But, it is best to replace the battery when it dies, or if the key fob displays a message in the multi-information display that reads, "Low key fob battery. Replace battery."
You'll need a flathead screwdriver and tape and patience to open the case. Locate a notch or gap in the bottom portion of the metal of the Mazda 3's key fob and insert the head of the screwdriver in it to pry off the lower part. Repeat the process for the top metal piece but be careful not to scratch the rubber ring on the bottom of the case.
There is a slot on the opposite side of the case that houses the battery. Use the flathead screwdriver with tape to gently open the case, beginning at one end and moving to the opposite. Remove the old CR2025 and replace it with a new one, ensuring that you place it face-up to ensure proper polarity. Install the cap on the battery again and secure both sides of your key fob case by pressing until they click.
After replacing the battery After replacing the battery, lock and unlock your doors to ensure that the fob works. If everything is in order, your Mazda 3 remote features can be used again.
Pairing Issues
If your key fob has stopped working all of a sudden, this could indicate that the transmitter inside your car is damaged. This is usually a matter of a professional to repair and will likely require a new key fob.
If you've tried replacing the battery and reprogramming the key fob, but it does not solve the issue it is possible that the chip in the key fob might be faulty. This can happen if your keyfob has been dropped, exposed to saltwater, or handled by dirty fingers.
To diagnose this issue You will need to locate a tiny "key" built into the fob's seam which allows you to lift it open and remove the circuit board. Then, you will be able to 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.
It is also possible to take a closer look at the battery connector terminals to determine if they're cracked or broken. If this is the case, soldering the terminals back to their place will usually restore the functionality of the key fob. You can also inspect the buttons for wear or damage. If they are loose, they can be soldered back into place, unless one has physically snapped.
Interference Signals
There's nothing more frustrating than trying to get the engine started in your car and seeing the message "No Fob Detected". It happens at the worst time, for instance the time you're late to work or have to pick up your children from daycare/school. The good thing is that there are steps you can take to troubleshoot the issue and figure out the cause.
Interference signals can affect the remote key fob's signal from the vehicle making it unable to function correctly. This could be caused by objects like buildings, weather conditions, and transmitters that operate on the same frequency. Interference can occur if 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 the water, it might be damaged. Water can damage the rubber seals of the electronic chip especially in the event that the key fob is submerged in water for a lengthy time. This can cause the chip to cease working and may require replacement of the key fob. If you have a key which can be programmed to work, you can clean it with isopropyl and electronic cleaners to restore its functionality. If this does nothing, it is likely that the chip has burned out and needs to be replaced.
Locking and unlocking of the Doors
The buttons on the keys send electronic signals to a solenoid in the car. mazda 3 replacement key fob G28 converts that signal into a mechanical action that locks and unlocks the doors. If the door lock isn't working, it may be a solenoid issue that requires some analysis with the help of a professional auto repair shop.
A dead 12 volt can also prevent the fob from working properly. This can happen when your battery has lost its charge or if your contacts become corrosion-prone. The good news is that a new battery can solve this issue in only minutes.
If the key fob won't work after you have changed the battery or re-program it the issue could be related to the receiver module. This device interprets radio frequency signals sent by the key fob to control the vehicle. If it breaks down it could be costly to repair.
To determine if this is the case, begin by putting your spare key into the key slot and setting the ignition to ON. Press the key fob button two times within 10 seconds without removing it. The Mazda 3 system will now be able to synchronize the key with your car and allow you to use it as your primary remote for driving. This allows you to program up three keys.