Changing the Battery in Your Mazda 3 Key Fob

There's nothing more annoying than getting in your car after a long and tiring day and realizing that the key fob battery is dead. This is a simple fix that can be done at a big box retailer or hardware store.

The addition of a spare key fob to your Mazda 3 can be an inexpensive way to save yourself from the hassle of being transported to a dealership and having them reprogram your keys.

Battery Replacement

Changing the battery in your Mazda 3 key fob is an easy procedure 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."

To open the key fob's casing You'll need a tape wrapped flathead screwdriver and some patience. The head of the flathead screwdriver in a notch or gap on the bottom of the metal of the mazda car key replacement 3 key fob to pry the lower half off. Repeat the process for the top piece of metal, but be sure not to damage the rubber ring at the bottom of the case.

There is a slot on the opposite side of the case that contains the battery. Make use of the tape-wrapped flathead screwdriver to gently pry open the case, starting on one side and then moving to the opposite. Remove the battery that was used and place in the new CR2025 and make sure it's in the right orientation for the correct polarity. Then, put the cap back on and then reattach both sides of the key fob case. Keep pressing until you hear them click.

Once you've replaced your battery check the fob to confirm it works by locking and unlocking your doors. If everything looks good you're good to go. Mazda 3 remote features can be used again.

Pairing Issues

If your key fob stopped working all of a sudden, this could indicate that the transmitter in the car is damaged. This usually requires the assistance of a professional for repair and will likely require a new replacement key fob.

If you've tried replacing the battery and reprogram the key fob but it hasn't worked the chip inside the key fob may be defective. This can occur if the key fob was dropped on hard surfaces and exposed to salt water or even brushed by dirty hands.

To determine the cause it is necessary to find a small "key" located in the seam of the fob that allows you to take it apart and remove the circuit board. You can then check the chip for corrosion or damage. It is recommended to use a clean towel to ensure that the chip is not damaged.

If you are unsure it is possible to check the battery connector's terminals for cracks, or breaks. If this is the situation then resoldering the terminals to their place will usually restore the functionality of the key fob. Additionally, you can look at the buttons to determine if they are worn or damaged. If the buttons are loose, they can be re-soldered and also if the button is physically snapped off.

Interference Signals

There is nothing more frustrating than glancing at a "No Fob Detected" message when trying to start your vehicle. This can happen at the most inconvenient time, for instance the time you're late to work or you're trying to collect your children from school or daycare. The good news is that there are a few steps you can take to pinpoint the issue and determine the cause.

Interference signals can cause the remote key fob to stop functioning in a proper manner. This could be caused by things like weather conditions, buildings, and transmitters that use the same frequency. Interference may also occur if you have an aftermarket device installed in your vehicle that transmits at the same frequency as the key fob.

In addition, if the key fob is exposed to salt or [Redirect-Refresh-0] the water, it might 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 may cease to function and require replacement of the keyfob. If you have a programmable key cleaning the chip using isopropyl alcohol or an electronic cleaner to help it get back to its original functionality. If this does nothing then it's likely that the chip has fried and will need to be replaced.

Locking/Unlocking of the Doors

The buttons on the key fob send electronic signals to a solenoid inside the car, which transforms the signal into a mechanical action that locks and unlocks the doors. If the door lock is not working, the problem could be due to a solenoid problem that requires analysis with the help of an expert repair shop for autos.

A dead 12 volt battery can also stop the fob from functioning properly. This could happen if your battery has lost its charge or if your contacts become corrosion-prone. The good news is that a new battery is able to fix this issue in just minutes.

The receiver module could be the cause if the key fob doesn't work after replacing the battery or re-program the device. This device interprets radio frequency signals sent by the key fob to control the vehicle. If it breaks down it could cost a lot to fix.

To confirm if this true, put your spare key into the key slot. Then turn the ignition ON. Press the key fob button twice within 10 seconds without removing it. The Mazda 3 system will now synchronize the key with the car and you can use it as your primary remote for driving. You can program up to three keys this manner.