Changing the Battery in Your Mazda 3 Key Fob

It's a pain to get in your car at the end of a long workday and find that the key fob is dead. This is a simple fix that is easily done at a big box retailer or at a hardware store.

A spare key fob for your Mazda 3 is an inexpensive method to avoid having to take it by a dealership to let them reprogram the keys.

Battery Replacement

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

You'll need a flathead screwdriver, tape and patience to open the case. Locate a notch or gap in the bottom of the metal part of your mazda 6 key fob 3's key fob and insert the head of the screwdriver into it to remove the lower portion. Repeat the procedure for the top piece of metal, but be sure not to damage the rubber ring on the bottom of the case.

When the fob case is open, you'll find a slot on either side of the case that houses the battery. Start on the other side of the case and then gently open it. Remove the old CR2025 and replace it with a brand new one, making sure to place it face-up to ensure proper polarity. Attach the cap to the battery again, and then attach both sides of your key fob case by pressing until they click.

Once you've replaced your battery check the fob to ensure it works by locking and unlocking your doors. If everything appears to be working you're now able to use your Mazda keys replacement 3's remote capabilities on the road again!

Pairing Issues

If your key fob stops working all of a sudden, this could indicate that the transmitter in the car is damaged. This is usually a matter of a professional to repair and may require a new key fob.

If you've tried to change the battery and reprogramme the key fob but it's not working, the chip inside the key fob might be faulty. This could happen if the key fob has been dropped on hard surfaces or exposed to salt water or even brushed by dirty hands.

To identify the issue You will need to locate a tiny "key" located in the seam of the fob that allows you to open it up and remove the circuit board. You can then check the chip for damage or corrosion. It is best to use a clean, dry paper towel to prevent damaging the microchip.

You can also take a close look at the battery connector's terminals to see if they are cracked or broken. If this is the case it is possible to solder the terminals back to their original position will usually restore the functionality of the key fob. Additionally, you can look at the buttons to see whether they're worn or damaged. If the buttons are loose, they can easily be soldered back into place and also if the button is physically snapped off.

Interference Signals

Few things are more annoying than looking at an "No Fob Detected" message when you attempt to start your vehicle. It can happen at the most unfavorable possible times, like when you're late for work or pick up your children from school or daycare. The good thing is that there are steps you can follow to resolve the issue and determine the root of the problem.

Interference signals can interfere with the remote key fob's signal from the vehicle which causes it to not function correctly. This can be caused by objects such as buildings, weather conditions and transmitters that use the same frequency. Interference can also occur if you have aftermarket equipment installed in the vehicle that transmits at the same frequency as the key fob.

The key fob could be damaged if it is exposed to salt water or water. The rubber seals on the electronic chip may be damaged by water, especially when it is submerged over an extended period of time, like in a pool or ocean at the beach. The chip may stop working and require replacement of the keyfob. If you own a programmable key cleaning the chip with isopropyl Alcohol or an electronic cleaner to help it get back to its original functionality. If this does not help, the chip is likely to be damaged and needs 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 converts this signal into mechanical action. It locks and unlocks doors. If the door lock doesn't work it could be due to an issue with the solenoid. This will require experts from repair shops to analyze.

A dead 12V battery can also hinder the fob from working effectively. This could happen if your battery fails to charge or if the contacts are damaged. The good news is that a new battery is able to fix this issue in just minutes.

If the key fob isn't working after you change the battery or re-program it, the issue might be with the receiver module. The device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle. It can be a costly repair if it becomes faulty.

To check if this is the case, begin by inserting your spare key into the key slot and setting the ignition to ON. Press the key fob twice within 10 seconds, without removing it. The Mazda 3 system synchronizes the key with the vehicle and you can use it as your primary driving remote. You can program up to three keys in this manner.