Changing the Battery in Your Mazda 3 Key Fob

It can be a bit frustrating to pull into your car at the end of a long day and discover that the key fob is dead. Luckily, it's an easy fix by purchasing a simple battery replacement from the hardware store or big box retailer.

The addition of a spare key fob to your mazda 6 key fob 3 can be an affordable solution to free yourself from the hassle of being towed to the dealership and having them re-program your keys.

Battery Replacement

The battery replacement in your Mazda 3 key fob is a simple process that you can do at home. But, you should only replace the battery when it goes out of service, or if the key fob displays a message in the multi-information display stating, "Low key fob battery. Replace battery."

You'll need to use a flathead screwdriver and tape and patience to open the case. Find a gap or notch in the bottom of the metal part of your mazda 5 key fob 3's key fob, and then insert the tip of the screwdriver to remove the lower part. Repeat the process for the top piece of metal Be careful not to scratch the rubber ring at the bottom of the case.

Once the fob case has been open, you'll find a slot on either side of the case, which houses the battery. Use the tape-wrapped flathead screwdriver to gently the case open, starting with one side and moving to the next. Take out the old CR2025 and replace it with a new one, making sure you put it on its face to ensure the correct direction of polarity. Finally, put the battery cap back on and reattach both sides to the key fob's case. Continue pressing until you can hear them click.

Now that you've replaced the battery Check the fob to verify that it is working by locking and unlocking your doors. If everything appears to be working then you're able to use the Mazda 3's remote functions to drive again!

Pairing Issues

This could mean that the transmitter in your car may have been damaged. It is typically a need for an expert to repair it and may require a new key fob.

If you've tried replacing the battery and reprogramming the key fob, but does not solve the issue it is possible the chip in the key fob could be damaged. This can happen if the keyfob has been dropped or exposed to saltwater or was touched by dirty fingers.

You'll need the tiny "key", which is built into the seam to remove the circuit board and diagnose the problem. Then, you can check the chip for corrosion or damage. To avoid damaging the chip, it is best to use a fresh paper towel.

If you are unsure then you should also examine the battery connector's terminals for cracks or breakage. If this is the case, then carefully reconnecting them will usually restore the function of the key fob. You can also examine the buttons for damage or wear. If the buttons are loose, they can be soldered back in place as well unless the button has 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 typically happens at most awkward times, such as when you are late for work or picking up children from daycare/school. The good thing is that there are a few steps you can follow to resolve the issue and determine the root of the problem.

Interference signals can cause the remote key fob to stop functioning properly. This can be caused by objects like weather conditions, buildings, and transmitters that operate on the same frequency. Interference can also occur when you have equipment from an aftermarket manufacturer installed in the vehicle that transmits on the same frequency as the key fob.

The key fob could be damaged if exposed to water or salty water. The rubber seals on the chip's electronic components can be penetrated by water, especially when it is submerged for long periods of time, such as in the ocean or a pool at the beach. This could cause the chip to cease working and may require replacement of the key fob. If you have a key which can be programmed, you can clean it using electronic cleaners or isopropyl to bring it back to its original function. If this doesn't work, the chip is likely to be damaged and Mazda 6 key fob will need to be replaced.

Locking or Unlocking the Doors

The buttons on the key fob transmit electronic signals to a solenoid inside the car, which converts that signal into a mechanical action that locks and unlocks the doors. If your door lock does not work, it could be an issue with the solenoid. This requires experts from repair shops to analyze.

A dead 12 volt battery could also stop the fob from functioning effectively. This can happen if the battery's charge is lost or if the contacts get corroded and stop transferring electricity. The problem can be addressed in minutes with a new battery.

The receiver module could be the reason why the key fob won't work after you replace the battery or program the device. This device receives radio frequency signals from the key fob and interprets them to control the functions of the vehicle. It can be expensive to repair if it is damaged.

To determine if this is the case, begin by putting your spare key into the key slot and mazda 6 key fob turning the ignition to ON. Press the key fob twice in a period of 10 seconds, without taking it out. The Mazda 3 system will now connect the key to the car and allow you to use it as your primary remote for driving. You can program up to three keys in this manner.