Changing the Battery in Your Mazda 3 Key Fob
There is nothing more frustrating than stepping into your vehicle after a long day, and discovering that the key fob battery is dead. Luckily, this is an easy fix by purchasing a simple battery replacement from the hardware store or big box retailer.
The addition of a spare key fob to your Mazda 3 can be an cost-effective way to stay away from having to be towed to the dealership and having them re-program your keys.
Battery Replacement
Changing the battery in the Mazda 3 key fob is an easy procedure that you can perform at home. It is recommended to replace it when the battery fails or you see a message reading "Low keyfob battery" on the multi-information display. Replace battery."
You'll need to use a flathead screwdriver, tape and patience to open the case. Place the flathead screwdriver's tip in a notch, or gap on the bottom of the metal of the Mazda 3 key fob to cut off the lower half. Repeat the process for the top metal piece but be careful not to scratch the rubber ring on the bottom of the case.
Once mazda 3 key fob programming is open, you'll be able to see a slot on either side of the case, which houses the battery. Start on the other side of the case, and then gently pry it open. Take out the old CR2025 and replace it with a new one, making sure that you put it on its face to ensure the correct direction of polarity. Install the cap on the battery the other side and attach both sides of your key fob case by pressing until they click.
Now that you've replaced the battery Check the fob to make sure it functions by locking and unlocking your doors. If everything looks good then you can begin using your Mazda 3's remote capabilities for the first time!
Pairing Issues
If your key fob stopped working all of a sudden it could be a sign that the transmitter inside your car is damaged. It is usually a job that requires a professional. You will require a new key fob.
If you've tried to replace the battery and reprogramme the key fob, but it hasn't worked the chip inside the key fob might be faulty. This can happen when the key fob has been dropped on hard surfaces and exposed to salt water, or even touched by dirty hands.
You'll need an extremely small "key", which is inserted into the seam to remove the circuit board and identify the problem. You will then be able check for any corrosion or damage on the electronic chip. It is best to use a clean towel to avoid damaging the microchip.
It is also possible to take a close look at the battery connector terminals to check if they're damaged or cracked. If this is the case, soldering the terminals back to their original position will usually bring back functionality to the key fob. Additionally, you can look at the buttons to see whether they are worn out or damaged. 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 the "No Fob Detected" message when trying to start your vehicle. This usually occurs at the most difficult moments, such as when you're late for work or when you have to pick up children from daycare or school. There are a few things you can do to help figure out what's causing the problem.
Interference signals can affect the remote key fob's signal from the vehicle and cause it to not function correctly. It can be caused by objects such as weather conditions, buildings, and transmitters operating on the same frequency. Interference could also occur if you have equipment from an aftermarket manufacturer installed in the vehicle that transmits on the same frequency as the key fob.
Additionally, if the key fob is exposed to salt or water it may be damaged. Water can penetrate the rubber seals of the electronic chip especially when the key fob has been submerged in water for a long time. This can cause the chip to stop functioning, requiring replacement of the key fob. If you have a key which can be programmed and cleaned using electronic cleaners or isopropyl to restore its function. If this doesn't work, the chip is likely fried and will need to be replaced.
Locking and Unlocking of Doors
The buttons on the key fob transmit electronic signals to the solenoid inside the car, which converts that signal into a mechanical action that locks and unlocks doors. If your door lock isn't working it could be due to an issue with the solenoid. This will require expert auto repair shops to investigate.
A dead 12V battery can also prevent the fob from functioning effectively. This is the case if the battery's charge is lost, or if the contacts become corroded, and stop transferring electricity. The problem can be addressed in a matter of minutes by replacing the battery.
If the key fob isn't functioning after you replace the battery or try to reprogram it the problem could be in the receiver module. This device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle. If it fails it could be costly to fix.
To check if this is the case, begin by inserting your spare keys into the key slot and turning the ignition to ON. Press the key fob twice for 10 seconds without removing it. The Mazda 3 system will now sync the key to the car and you can use it as your primary remote for driving. This lets you program up to three keys.