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Changing the Battery in Your Mazda 3 Key FobThere's nothing more annoying than getting in your car after a long day, and finding that the key fob battery is dead. Luckily, it's an easy fix by purchasing 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 the hassle of being driven to the dealership and having them reprogram your keys.Battery ReplacementYou can change the battery on your Mazda 3 keyfob at home. It is recommended to replace it if the battery goes out or if you notice a message stating "Low keyfob battery" on the multi-information display. G28CarKeys ."You'll need to use an flathead screwdriver along with tape and patience to open the case. Find a gap or notch in the bottom of the metal part of your Mazda 3's key fob and insert the head of the screwdriver into it to break off the lower part. Repeat this procedure for the top portion of the metal Be careful not to damage the rubber ring at bottom of the key fob's case.Once the fob case is open, you'll find the slot on either side of the case, which houses the battery. Use the tape-wrapped flathead screwdriver to gently open the case, beginning on one side before moving to the other. Remove the old CR2025 and replace it with a new one, making sure you put it on its face to ensure proper the polarity. Finally, put the cap of the battery back on and reattach both sides of the key fob's case, pressing until you hear them click.After replacing the battery Lock and unlock your doors to confirm that the fob works. If everything is in order then you're able to use your Mazda 3's remote features to drive again!Pairing IssuesThis could mean that the transmitter inside your car is damaged. This typically requires an expert repair and may need a new key fob.If you've tried to replace the battery and reprogram the key fob, but it's not working then the chip in the key fob might be defective. This can happen if the keyfob was dropped or exposed to saltwater or touched by dirty fingers.To identify the issue, you will need to locate a tiny "key" embedded in the fob's seam which allows you to take it apart and take out the circuit board. Then, you can examine the electronic chip for damage or corrosion. To avoid damaging the chip, it is recommended to clean the chip with a new paper towel.If you're not sure it is possible to check the battery connector's terminals for cracks or breakage. If this is the case you can solder the terminals back to their original position will usually restore functionality to the key fob. You can also check the buttons for wear or damage. If the buttons are loose, they can be soldered back into place in the event that the button is actually snapped off.Interference SignalsThere are few things 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 occasions, such as when you're late to work or you're trying to collect your children from school or daycare. There are several things you can do to troubleshoot and find out what's causing the problem.Interference signals can cause the remote key fob to cease working in a proper manner. This can be caused from objects such as weather conditions, buildings and transmitters using the same frequency. Interference could occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob.In addition, if the key fob is exposed to water or salt the water, it might be damaged. The water can penetrate the rubber seals of the electronic chip, particularly in the event that the key fob is submerged in water for an extended duration. The chip may cease to function and may require replacement of the keyfob. If you have a programable key cleaning the chip using isopropyl alcohol or an electronic cleaner to aid in its return to functionality. If this does nothing, it is likely that the chip has fried and requires replacement.Locking and Unlocking of DoorsThe buttons on the key fob send electronic signals to the solenoid of the car, which then transforms this signal into a mechanical action. It locks and unlocks doors. If the door lock is not working, the issue could be a solenoid malfunction that requires some investigation by an expert repair shop for autos.A dead battery of 12 volts can also prevent the fob from functioning correctly. This can occur if your battery is not charged or if your contacts get damaged. This problem can be fixed in just a few minutes by purchasing a new battery.If the key fob isn't working after you have changed the battery or try to program it again then the problem may be with the receiver module. This device receives radio frequency signals from the key fob and interprets them to control the functions of the vehicle. It could be expensive to repair if it malfunctions.To check if this is the case, start by putting your spare key into the key slot and turning the ignition to ON. Press the key fob twice within 10 seconds without taking it. The Mazda 3 system will now synchronize the key with the car and you can use it as your primary remote for driving. This allows you to program up three keys.