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20 Trailblazers Are Leading The Way In Mazda 6 Key Fob
Changing the Battery in Your Mazda 3 Key Fob

It's a pain to pull into your car at the end of a long workday and discover that the key fob is dead. Luckily, G28 is simple to fix it with a simple battery replacement from the hardware store or big box retailer.

A spare key fob for your Mazda 3 is an inexpensive alternative to not having to take it to a dealership to have them re-program your keys.


Battery Replacement

You can change the battery on your Mazda 3 keyfob at home. You should only replace it when the battery fails or you notice a message stating "Low keyfob battery" on the multi-information display. Replace battery."

You'll need a flathead screwdriver with tape and patience to open the case. Find a gap or notch in the bottom part of the metal of the Mazda 3's key fob and insert the head of the screwdriver in it to pry off the lower part. Repeat the procedure for the top metal piece but be careful not to scratch the rubber ring at the bottom of the case.

When the fob case is opened, you'll notice the slots on either side of the case that houses the battery. Use the flathead screwdriver with tape to gently open the case, starting on one side before moving to the next. Take out the old CR2025 and replace it with a new one, making sure that you place it face-up to ensure the correct orientation. Install the cap on the battery again and attach both sides of your key fob case by pressing until they click.

After replacing the battery After replacing the battery, lock and unlock your doors to ensure that the fob is working. If everything appears to be working then you're able to use your Mazda 3's remote capabilities on the road again!

Pairing Issues

If your key fob has stopped working all of a sudden it could be because the transmitter inside 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 programming the key fob, but it did not resolve the issue, it is possible that the chip inside the key fob is faulty. This can happen if the key fob has been dropped on hard surfaces or exposed to salt water or even brushed by dirty hands.

You'll need the tiny "key" that is built into the seam, to remove the circuit board and identify the issue. Then, you will be able check for any damage or corrosion on the electronic chip. To avoid damaging the chip, it is recommended to use a clean paper towel.

It is also possible to take a close look at the battery connector's terminals and determine if they're cracked or broken. If this is the case, carefully soldering them back in place can generally restore the functionality of the key fob. You can also check the buttons for damage or wear. If the buttons are loose, they can be soldered back and also if the button has actually snapped off.

Interference Signals

Few things are more annoying than looking at the "No Fob Detected" message when trying to start your car. This happens at the worst occasions, such as when you're late for work or you're trying to collect your children from daycare/school. The good news is that there are steps you can take to troubleshoot the issue and determine the root of the problem.

Interference signals can disrupt the remote key fob's signal to the vehicle which causes it to not function correctly. This can be caused from things like weather conditions, buildings, as well as transmitters operating on the same frequency. Interference could occur if your vehicle has aftermarket equipment that transmits at the same frequency as your key fob.

In addition, if the key fob is exposed to water or salt waters, it could be damaged. The rubber seals on the electronic chip could be penetrated by water, especially if it is submerged for an extended period of time like in a swimming pool or at the beach. This could cause the chip's function to cease and may require replacement of the key fob. If you have a programable key cleaning the chip with isopropyl Alcohol or an electronic cleaner to aid in its return to functionality. If this does nothing, it is likely that the chip is fried and will need to be replaced.

Locking/Unlocking of the Doors

The buttons on the key fob transmit electronic signals to the solenoid inside the car, which converts the signal into mechanical action. This locks and unlocks doors. If the door lock isn't functioning, the issue could be a solenoid malfunction that requires investigation by a professional auto repair shop.

A dead 12 volt could also hinder the fob from working effectively. This can happen if the battery loses charge, or if the contacts are corroded and stop transmitting electricity. This problem can be fixed in a matter of minutes by replacing the battery.

If the key fob isn't functioning after you change the battery or reprogram it the problem could be with the receiver module. The device detects radio frequency signals sent by the key fob to control the vehicle. It could be expensive to repair if it is damaged.

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