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Changing the Battery in Your Mazda 3 Key Fob
There's nothing more frustrating than getting to your vehicle after a long day, and finding that the key fob battery is dead. This is a simple fix that can be done at a major box retailer or at a hardware store.
Incorporating a spare key fob to your Mazda 3 can be an affordable solution to free yourself from the hassle of being towed to the dealership and having them re-program your keys.
Battery Replacement
Removing the battery from the Mazda 3 key fob is a simple process that you can do at home. But, it is best to replace the battery if it is dead, or if the key fob displays a message on the multi-information display saying, "Low key fob battery. Replace battery."
To open the case of your key fob you'll need a tape-wrapped flathead screwdriver as well as some patience. The flathead screwdriver's head 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 piece of metal, but be sure not to scratch the rubber ring that is on the bottom of the case.
There is a slot on each side of the fob case, which houses the battery. Use the tape-wrapped flathead screwdriver to gently open the case, beginning with one side and moving to the opposite. Remove the battery that was used and place in the new CR2025 ensure that it's in the right orientation for proper polarity. Finally, place the cap on the battery and reconnect both sides of the key fob case, pressing until you can hear them click.
After replacing the battery check the fob to make sure it works by locking and unlocking your doors. If everything appears to be 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 typically requires an expert repair and may require a new replacement key fob.
If you've tried replacing the battery and reprogramming the key fob, but it isn't solving the issue it is possible the chip inside the key fob is damaged. This can happen when the key fob has been dropped on hard surfaces, exposed to salt water or even brushed by dirty hands.
You'll need an extremely small "key", which is inserted into the seam, to remove the circuit board and determine the issue. Then, you will be able to look for any corrosion or damage on the electronic chip. To avoid damaging the chip, it is best to use a fresh paper towel.
You may also take a close look at the battery connector terminals to examine if they're cracked or broken. If this is the case, carefully reconnecting them can usually restore the function of the key fob. In the same way, you can examine the buttons to determine whether they're worn or damaged. If they are loose, they can be resoldered to their original position unless they have physically snapped.
Interference Signals
There are few things more difficult than trying to start your vehicle and getting the message "No Fob Detected". This happens at the worst situations, like when you're running late to work or when you have to pick up your children from school or daycare. There are a few things you can try to figure out the root of the issue.
Interference signals can disrupt the remote key fob signal coming from the vehicle and cause it to not function properly. This can be caused by things like weather conditions, buildings, as well as transmitters operating 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 seawater, it may be damaged. The rubber seals on the electronic chip may be damaged by water, particularly in the event that it is submerged for long periods of time, such as in the ocean or a pool at the beach. The chip may stop working and may require replacement of the keyfob. If you have a key that is able to be programmed or programmed, you can clean it with isopropyl and electronic cleaners to restore its function. If this doesn't work the chip, it is likely to be fried and will require to be replaced.
Locking/Unlocking of the Doors
The buttons on the key fob send electronic signals to a solenoid in the car, which transforms the signal into a mechanical action that locks and unlocks the doors. If the door lock does not work it could be because of an issue with the solenoid. This will require professionals from auto repair shops to examine.
A dead battery of 12 volts can cause the fob to stop functioning correctly. This happens when the battery loses charge or the contacts get corroded and stop transferring electricity. The problem can be addressed in minutes with a new battery.
G28CarKeys may be the problem if the key fob won't work after you replace batteries or reprogram the device. This device interprets radio frequency signals transmitted by the key fob to control the vehicle. It can be expensive to repair if it becomes faulty.
To verify if this is true, place your spare key in the key slot. Then, turn the ignition on. Press the key fob twice within 10 seconds without taking it. The Mazda 3 system will now sync the key to the car and allow you to use it as your primary remote for driving. This lets you program up to three keys.