Changing the Battery in Your Mazda 3 Key Fob

There's nothing more annoying than getting in your car after a long day, and discovering that your key fob battery is dead. Fortunately, this is an easy fix using simple battery replacement from an hardware store or a big box retailer.

A spare key fob for your mazda 6 key 3 is an inexpensive option to not have to take your vehicle by a dealership to let them re-program your keys.

Battery Replacement

Changing the battery in the mazda 6 Key 3 key fob is an easy procedure that you can do at home. You should only replace it if the battery dies or mazda 6 key if you notice a message stating "Low keyfob battery" on the multi-information display. Replace battery."

To open the key fob case it requires a tape-wrapped flathead screwdriver, along with 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 in it to remove the lower half. Repeat the procedure for the top metal piece Be careful not to scratch the rubber ring at the bottom of the case.

You'll find a slot on each side of the case that contains the battery. Start with one side of the case and then gently open it. Remove the battery that was used and place in a new CR2025 ensure that it's facing upwards to ensure the correct polarity. Finally, place the cap back on and reattach both sides of the key fob's case. Continue pressing until you can hear them click.

After replacing the battery check the fob to verify that it is working by locking and unlocking your doors. If everything is in order the Mazda 3 remote features can be used again.

Pairing Issues

This could be a sign that the transmitter in your car is damaged. This typically requires the assistance of a professional for repair and may require a new replacement key fob.

If you have tried replacing the battery and reprogramming the key fob, but has not solved the problem it is possible the chip in the key fob may be faulty. This could happen if the key fob has been dropped on hard surfaces, exposed to salt water or even touched by dirty hands.

You'll need to locate an extremely small "key", which is inserted into the seam, to remove the circuit board to identify the issue. You will then be able to check for any damage or corrosion on the electronic chip. To avoid damaging the chip, it's best to use a fresh paper towel.

If you are unsure then you should also examine the battery connector terminals for cracks, or breaks. If this is the case, carefully soldering them back in place can usually restore the function of the key fob. You can also check the buttons for wear or damage. If the buttons are loose, they can be re-soldered and also if the button is actually snapped off.

Interference Signals

There are few things more frustrating than staring at the "No Fob Detected" message when you attempt to start your vehicle. It happens at the worst occasions, such as when you're late to work or have to pick up your children from daycare/school. The good news is that there are steps you can take to pinpoint the issue and figure out the cause.

Interference signals can cause the remote key fob to stop functioning properly. This could be caused by objects such as buildings, weather conditions and transmitters that operate on the same frequency. Interference could occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob.

The key fob may also be damaged if it is exposed to water or salty water. The rubber seals on the electronic chip can be shattered by water, especially if it is submerged for an extended period of time, like in the ocean or a pool at the beach. The chip may stop working and require replacement of the keyfob. If you have a key that has the ability to be programmed to work, you can clean it with isopropyl or electronic cleaners to restore its function. If this does not help the chip, it is likely to be fried and will require to be replaced.

Locking/Unlocking the Doors

The buttons on the key fob transmit electronic signals to the solenoid inside the car, which transforms the signal into mechanical action. It locks and unlocks doors. If the door lock does not work, it could be an issue with the solenoid. This requires professional auto repair shops to examine.

A dead 12 volt can cause the fob to stop working effectively. This is the case if the battery's charge is lost, or if the contacts get corroded and stop transferring electricity. The good news is that a new battery is able to resolve this issue in a matter of minutes.

If the key fob won't work after you have changed the battery or try to reprogram it then the problem may be in the receiver module. The device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle. It could be a costly repair if the device becomes defective.

To determine whether this is the case, start by inserting your spare keys into the key slot and turning the ignition to ON. Press the key fob button two times within 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 way.