Changing the Battery in Your Mazda 3 Key Fob

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

Adding 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

The battery replacement in the Mazda 3 key fob is an easy procedure that you can perform at home. You should only replace it if the battery is dead or you notice a message stating "Low keyfob battery" on the multi-information display. Replace battery."

To open the key fob's case, you'll need a tape-wrapped flathead screwdriver and some patience. Insert the flathead screwdriver's head in a notch, or gap in the bottom part of the Mazda 3 key fob to cut off the lower half. Repeat the process for the top metal piece, but be sure not to damage the rubber ring on the bottom of the case.

Once the fob's case is open, you'll be able to see a slot on either side of the case that houses the battery. Start on the other side of the case, and then gently push it open. Remove the battery that was used and place in the new CR2025, making sure that it's in the right orientation for the correct orientation. Then, put the cap of the battery back on and reconnect both sides of the key fob case. Keep pressing until you hear them click.

Now that you've replaced the battery check the fob to ensure it is working by locking and unlocking your doors. If everything is in order, your Mazda 3 remote features can be used again.

Pairing Issues

This could indicate that the transmitter in your car has been damaged. This is usually a matter for a professional, and you will require a new key fob.

If you've tried replacing the battery and reprogramming the key fob, but has not solved the problem it is possible the chip inside the key fob might be malfunctioning. This could happen if the key fob was dropped on hard surfaces or exposed to salt water or even touched by dirty hands.

You'll need an extremely small "key", which is built into the seam, to take off the circuit board and identify the problem. You can then check the electronic chip for corrosion or damage. To avoid damaging the microchip, it is best to use a fresh paper towel.

You may also take a close look at the battery connector's terminals and examine if they're cracked or broken. If this is the situation then resoldering the terminals to their original position will usually restore the functionality of the key fob. You can also inspect the buttons for wear or damage. If the buttons are loose, they can easily be soldered back in place regardless of whether a button has physically snapped off.

Interference Signals

Few things are more annoying than looking at the "No Fob Detected" message when trying to start your car. It usually happens at the most unpopular time, such as the time you're late to work or if you're picking up kids from daycare or school. The good news is that there are a few steps you can follow to resolve the issue and figure out the cause.

Interference signals can interfere with the remote key fob signal from the vehicle which causes it to not work properly. This could be caused by objects like buildings, weather conditions, and transmitters that operate on 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 water it may be damaged. Water can get into the rubber seals of the electronic chip especially in the event that the key fob is submerged in water for a prolonged duration. The chip can stop working and may require replacement of the keyfob. If you have a key that can be programmed or programmed, you can clean it using isopropyl or electronic cleaners to bring it back to its original functionality. If this doesn't help will be able to fix the issue, then the chip has been damaged and will need to be replaced.

Locking/Unlocking of the Doors

The buttons on the key fob transmit electronic signals to the solenoid in the car, which then transforms the signal into mechanical action. This locks and unlocks doors. If the door lock isn't working, the issue could be due to a solenoid problem that requires investigation with the assistance of an expert repair shop for autos.

A dead 12 volt can also hinder the fob from working properly. This can occur if your battery is not charged or if the contacts are corroded. This issue can be solved in minutes with a new battery.

If the key fob isn't working after you change the battery or program it again then the problem may be in the receiver module. The device detects radio frequency signals sent by the key fob to control the vehicle. If it fails it could cost a lot to fix.

To test if this is true, put your spare key into the key slot. Then, turn the ignition on. Press the key fob twice within 10 seconds, without removing it. The mazda key replacement (highwave.kr) 3 system will now be able to synchronize the key with your car and allow you to use it as your primary remote for driving. This allows you to program up to three keys.