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Changing the Battery in Your Mazda 3 Key Fob

There's nothing more frustrating than returning to your car after a long day, and discovering that your key fob battery is dead. This is a simple solution that can be accomplished at a major site box retailer or at a hardware store.

The addition of a spare key fob to your Mazda 3 can be an inexpensive way to save yourself from having to be towed to the dealership and having them re-program your keys.

Battery Replacement

Changing the battery in the mazda key fob 3 key fob is an easy procedure that you can do at home. It is recommended to replace it if the battery dies or if you see a message saying "Low keyfob battery" on the multi-information display. Replace battery."

To open the key fob case it requires a tape-wrapped flathead screwdriver and some patience. Find a gap or notch in the bottom of the metal part of your Mazda 3's key fob, and then insert the head of the screwdriver to break off the lower portion. Repeat the procedure for the top piece of metal however, be careful not to scratch the rubber ring on the bottom of the case.

Once the fob case is open, you'll be able to see the slot on either side of the case that houses the battery. Make use of the tape-wrapped flathead screwdriver to gently pry the case open, starting at one end and moving to the opposite. Take out the old CR2025 and replace it with a new one, making sure to place it face-up to ensure the correct the polarity. Put the cap of the battery on again and secure both sides of your key fob case by pressing until they click.

After you've replaced the battery check the fob to ensure it works by locking and unlocking your doors. If everything looks good then you can begin using the Mazda 3's remote features for the first time!

Pairing Issues

If your key fob stops working all of a sudden it could be a sign that the transmitter inside your car has been damaged. This typically requires an expert to repair it and will likely require a new key fob.

If you've tried to replace the battery and reprogramme the key fob but it's not working, the chip inside the key fob may be defective. This could be the case if the keyfob has been dropped or exposed to saltwater or handled by dirty fingers.

You'll need to find the tiny "key", which is built into the seam, to take off the circuit board to identify the issue. Then, you will be able check for any corrosion or damage on the electronic chip. To prevent damaging the chip, it's best to use a fresh paper towel.

You can also examine the battery connector's terminals and check if they're cracked or broken. If this is the case, carefully connecting them back can often restore the function of the key fob. Similarly, you can inspect the buttons to determine if they are worn or damaged. If the buttons are loose, they can be re-soldered regardless of whether the button has actually snapped off.

Interference Signals

There is nothing more frustrating than staring at the "No Fob Detected" message when you attempt to start your vehicle. This can happen at the most inconvenient time, for instance when you're late for work or pick up your children from school or daycare. The good news is that there are steps you can take to troubleshoot the issue and figure out the root of the problem.

Interference signals can cause the remote key fob to stop functioning in a proper manner. This can be caused by objects such as weather conditions, buildings and transmitters operating on the same frequency. Interference can also occur when you have an aftermarket device installed in your vehicle that transmits on the same frequency as the key fob.

The key fob can also be damaged if exposed to salt water or water. The rubber seals on the electronic chip may be shattered by water, particularly when it is submerged for an extended period of time such as in a pool or at the beach. This could cause the chip's function to cease and may require replacement of the key fob. If you have a programmeable key you can clean the chip with isopropyl alcohol or an electronic cleaner to help it return to functionality. If this does nothing, it is likely that the chip is fried and will need to be replaced.

Locking and unlocking of the Doors

The buttons on the keys send electronic signals to a solenoid in the car, which converts the signal into a mechanical action that locks and unlocks doors. If the door lock is not working, the problem may be a solenoid issue that requires some investigation with the assistance of an expert auto repair shop.

A low-voltage battery can cause the fob to stop functioning properly. This happens when the battery loses its charge or the contacts are corroded and stop transmitting electricity. The good news is that a new battery is able to fix this issue in just minutes.

The receiver module may be the cause if the key fob isn't working after you replace the battery or re-program the device. This device receives radio frequency signals from the key fob and interprets them to control the functions of the vehicle. If it malfunctions it could be costly to repair.

To check whether this is the case, begin by inserting your spare keys into the key slot and setting the ignition to ON. Press the key fob two times 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. You can program up to three keys this manner.