15 Best Mazda 6 Key Fob Bloggers You Must Follow Changing the Battery in Your Mazda 3 Key Fob

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

A spare key fob for your Mazda 3 is an inexpensive method to avoid having to take your vehicle to a dealership in order to have them re-program your keys.

Battery Replacement

Changing the battery 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 fails, or when the key fob displays a message in the multi-information display saying, "Low key fob battery. Replace battery."

To open the key fob case you'll need a tape-wrapped flathead screwdriver as well as some patience. Find a gap or notch in the bottom metal part of your Mazda 3's key fob, and then insert the head of the screwdriver to remove the lower half. Repeat this procedure for the top metal part Be careful not to damage the rubber ring at bottom of the key fob's case.

When the fob case is open, you'll see a slot on either side of the case that houses the battery. Make use of the tape-wrapped flathead screwdriver to gently pry the case open, beginning on one side before shifting to the other. Take out the old CR2025 and replace it with a brand new one, ensuring that you place it face-up to ensure the correct orientation. Then, put the cap of the battery back on and reattach both sides of the key fob case. Keep pressing until you can hear them click.

Once you've replaced your battery, test the fob to ensure it functions 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. It is typically a need for an expert repair and will likely require a new replacement key fob.

If you've tried to change the battery and reprogram the key fob, but it's not working the chip inside the key fob might be faulty. This could happen if the keyfob has been dropped, exposed to saltwater, or was touched by dirty fingers.

To identify the issue You will need to locate a tiny "key" that is embedded into the edge of the fob that allows you to take it apart and remove the circuit board. Then, you will be able check for any corrosion or damage on the chip. To avoid damaging the chip, it's best to use a fresh paper towel.


You may also take a closer look at the battery connector's terminals and see if they are cracked or broken. If this is the case you can solder the terminals back to their place will usually restore functionality to the key fob. Similarly, you can inspect the buttons to see whether they've been worn out or damaged. If the buttons are loosened, they can be resoldered into position, unless they've physically snapped.

Interference Signals

There are few things more difficult than trying to start your vehicle and getting the message "No Fob Detected". It typically happens at most inconvenient moments, like the time you're late to work or picking up children from school/daycare. There are a few things you can do to help figure out what's the cause.

Interference signals can interfere with the remote key fob's signal to the vehicle, causing it to not work correctly. This can be caused by objects such as weather conditions, buildings, and transmitters that operate on the same frequency. Interference can 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 water seawater, it may be damaged. The rubber seals on the electronic chip can be damaged by water, particularly when it is submerged for an extended period of time such as in a swimming pool or at the beach. This can cause the chip to stop functioning, requiring replacement of the key fob. If you have a key that has the ability to be programmed to work, you can clean it using electronic cleaners or isopropyl to restore its function. If this doesn't help will be able to fix the issue, then the chip is fried and needs to be replaced.

Locking and Unlocking the Doors

The buttons on the key fob send electronic signals to the solenoid of the car, which then converts this signal into mechanical action. It locks and unlocks doors. If the door lock is not working, it could be due to a solenoid problem that requires some analysis with the help of a professional auto repair shop.

A dead 12 volt battery could also prevent the fob from functioning properly. This could happen if the battery's charge is lost or the contacts are corroded and stop transmitting electricity. The good news is that a new battery can fix this issue in just minutes.

The receiver module may be the reason why the key fob isn't working after you replace batteries or reprogram the device. linked website receives radio frequency signals from the key fob and interprets them to control the functions of the vehicle. If it breaks down it could cost a lot to repair.

To check whether this is the case, start by inserting the spare key into the key slot and turning the ignition to ON. Press the key fob twice within 10 seconds without taking it. The Mazda 3 system will now sync the key to the vehicle and you can then use it as your primary remote for driving. This lets you program up to three keys.