Changing the Battery in Your Mazda 3 Key Fob
There's nothing more annoying than stepping into your car after a long and tiring day and realizing that the key fob battery is dead. This is a simple solution that can be accomplished at a big box retailer or hardware store.
A spare key fob to your Mazda 3 can be an cost-effective way to stay away from having to be driven to the dealership and having them re-program your keys.
Battery Replacement
Changing the battery in the Mazda 3 key fob is an easy process that can do at home. But, it is best to replace the battery when it is dead, or if the key fob shows a message on the multi-information display saying, "Low key fob battery. replace mazda key ."
To open the key fob's casing it requires a tape-wrapped flathead screwdriver and some patience. Locate a notch or gap in the bottom metal part of your Mazda 3's key fob, and then insert the head of the screwdriver into it to remove the lower part. Repeat the procedure for the top metal piece Be careful 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. Use the flathead screwdriver with tape to gently pry open the case, beginning on one side and then shifting to the other. Take out the old CR2025 and replace it with a new one, making sure you place it face-up to ensure proper polarity. Then, put the battery cap back on and reattach both sides to the key fob case. Keep pressing until you can hear them click.
After replacing the battery After replacing the battery, lock and unlock your doors to verify that the fob works. If everything is working, you can start using the Mazda 3's remote functions 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 new key fob.
If you have tried replacing the battery and programming the key fob, but this does not solve the issue it is possible that the chip inside the key fob could be damaged. This could happen if the keyfob was dropped, exposed to saltwater, or touched by dirty fingers.
You will need to locate an extremely small "key" that is inserted into the seam, in order to remove the circuit board and diagnose the issue. You will then be able to check for any damage or corrosion on the chip. It is recommended to clean the paper towel to prevent damaging the microchip.
If you aren't sure it is possible to check the battery connector terminals for cracks or broken. If this is the case, then carefully connecting them back can often restore the function of the key fob. Similarly, you can inspect the buttons to see whether they're worn or damaged. If the buttons are loosened, they can be resoldered into place, unless one has physically snapped.
Interference Signals
Few things are more frustrating than looking at an "No Fob Detected" message when you attempt to start your car. It typically happens at most awkward time, such as the time you're late to work or picking up children from daycare/school. The good news is that there are a few steps you can follow to resolve the issue and figure out what is causing it.
Interference signals can interfere with the remote key fob's signal to the vehicle making it unable to function correctly. This can be caused by objects such as weather conditions, buildings, 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 water or salt seawater, it may be damaged. Water can damage the rubber seals of the electronic chip particularly when the key fob is submerged in water for a lengthy time. This can cause the chip to stop working, requiring replacement of the key fob. If you have a key that is able to be programmed, you can clean it using isopropyl or electronic cleaners to restore its function. If this does nothing will be able to fix the issue, then the chip has fried and requires replacement.
Locking and Unlocking the Doors
The buttons on the key fob transmit electronic signals to the solenoid in the car, which transforms this signal into a mechanical action. It locks and unlocks doors. If your door lock doesn't work it could be due to an issue with the solenoid. This requires professionals from repair shops to look into.
A dead battery of 12 volts can cause the fob to stop functioning properly. This can happen when your battery fails to charge or if your contacts become damaged. This issue can be resolved within a few minutes using a new battery.
The receiver module could be the problem if the key fob doesn't work after replacing the battery or reprogram the device. The device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle. It can be a costly repair if it becomes faulty.
To test if this is true, put your spare key into the key slot. Then turn the ignition ON. Press the key fob button twice within 10 seconds without taking it. The Mazda 3 system will now synchronize the key with the vehicle and you can then use it as your primary remote for driving. This allows you to program up to three keys.