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Changing the Battery in Your Mazda 3 Key Fob
It is frustrating to pull into your car at the end of a long, hard day and discover that your key fob is dead. Fortunately, this is an easy fix with the simple replacement of a battery at the hardware store or big box retailer.
The addition of a spare key fob to your Mazda 3 can be an inexpensive way to save yourself from the hassle of being taken to the dealer and having them re-program your keys.
Battery Replacement
Changing the battery in your Mazda 3 key fob is a simple process 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 a flathead screwdriver, tape and patience to open the case. Insert the flathead screwdriver's tip into a notch, or gap on the bottom metal of the Mazda 3 key fob to cut off the lower half. Repeat the procedure for the top piece of metal, but be sure not to damage the rubber ring that is on the bottom of the case.
You'll find a slot on each side of the case that contains the battery. Make use of the tape-wrapped flathead screwdriver to gently open the case, beginning on one side and then shifting to the other. Remove the old battery and put in the new CR2025 to ensure that it's face-up for the correct orientation. Place the battery cap on 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 looks good, you can start using the Mazda 3's remote functions to drive again!
Pairing Issues
If your key fob stops suddenly it could mean that the transmitter inside the car has been damaged. This typically requires a professional to repair and will likely need a new key fob.
If you have tried replacing the battery and reprogramming the key fob, but this has not solved the problem it is possible that the chip in the key fob is faulty. This can occur if the key fob has been dropped on hard surfaces and exposed to salt water or even touched by dirty hands.
You will need to locate the tiny "key", which is built into the seam, in order to remove the circuit board and determine the issue. Then, you can examine the electronic chip for damage or corrosion. It is best to use a clean paper towel to keep the microchip from being damaged.
If you're not sure it is possible to check the battery connector's terminals for cracks or broken. If this is the situation then resoldering the terminals to their original position will usually restore functionality to the key fob. You can also inspect the buttons for wear or damage. If the buttons are loosened, they can be resoldered into position, unless they've physically snapped.
There's nothing more frustrating than trying to get the engine started in your car only to see the message "No Fob Detected". It can happen at the most unfavorable time, for instance the time you're late to work or have to pick up your children from school or daycare. The good thing is that there are steps you can take to pinpoint the issue and determine what is causing it.
Interference signals can disrupt the remote key fob signal from the vehicle, causing it to not work properly. This can be caused by objects such as buildings, weather conditions and transmitters that use the same frequency. Interference may also occur if you have an aftermarket device installed in the vehicle that transmits on the same frequency as the key fob.
In addition, if your key fob is exposed to salt or the water, it might be damaged. The rubber seals on the chip's electronic components can be damaged by water, particularly when it is submerged for long periods of time such as in a swimming pool or at the beach. This could cause the chip's function to cease and require replacement of the key fob. If you have a programable key, you can clean the chip with isopropyl alcohol or an electronic cleaner to aid in its return to working. If this doesn't work will be able to fix the issue, then the chip has burned out and needs to be replaced.
Locking and Unlocking the Doors
The buttons on the keys send electronic signals to a solenoid within the car that then converts the signal into a mechanical action that locks and unlocks doors. If the door lock is not working, the problem could be a solenoid issue that requires some analysis with the help of a professional auto repair shop.
A dead 12 volt could also stop the fob from working effectively. This can happen when your battery fails to charge or if the contacts become corroded. 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 have changed the battery or try to program it again, the issue might be related to the receiver module. The device interprets radio frequency signals received by the key fob to control the vehicle. It could be expensive to repair if it is damaged.
To test if this is true, place your spare key into the key slot. Then, turn the ignition on. Press the key fob button twice in a matter of 10 seconds without removing it. The Mazda 3 system synchronizes the key with the vehicle, so you can now use it as your primary driving remote. This allows you to program up to three keys.