Changing the Battery in Your Mazda 3 Key Fob

It's a pain to drive off at the end of a long, hard day and find that the key fob is dead. This is a simple solution that can be accomplished at a major box retailer or at a hardware store.

A spare key fob for your Mazda 3 is an inexpensive option to not have to take your vehicle by a dealership to let them reprogram the keys.

Battery Replacement

The battery replacement in the Mazda 3 key fob is an easy procedure that you can perform at home. You should only replace it when the battery is dead or you see a message saying "Low keyfob battery" on the multi-information display. Replace battery."

To open the case of your key fob, you'll need a tape-wrapped flathead screwdriver, along with some patience. Place the head of the flathead screwdriver into a notch, or gap, on the bottom metal of the Mazda 3 key fob to remove the lower part. Repeat the process for the top metal piece, but be sure not to scratch the rubber ring at the bottom of the case.

When the fob case is open, you'll find an opening on either side of the case that houses the battery. Use the tape-wrapped flathead screwdriver to gently pry open the case, beginning at one end and moving to the other. Remove the old CR2025 and replace it with a new one, ensuring that you place it face-up to ensure proper direction of polarity. Put the cap of the battery on the other side and attach both sides of your key fob case by pressing until they click.

After replacing the battery Lock and unlock your doors to confirm that the fob is working. If everything is in order then you're able to use your mazda 6 key 3's remote features for the first time!

Pairing Issues

If your key fob stops suddenly, this could indicate that the transmitter in the car has been damaged. It is usually a job for a professional and you will need a new key fob.

If you've tried replacing the battery and reprogramming the key fob, but this does not solve the issue it is possible that the chip inside the key fob could be defective. This can occur if the key fob has been dropped on hard surfaces and exposed to salt water or even touched by dirty hands.

You'll need to find an extremely small "key", which is inserted into the seam, in order to remove the circuit board to identify the issue. Then, you can check the chip for corrosion or damage. It is best to use a clean towel to prevent damaging the microchip.

If you're not sure you are not sure, you can check the battery connector terminals for cracks or broken. If this is the case, soldering the terminals back into place will typically restore functionality to the key fob. You can also examine the buttons for damage or wear. If the buttons are loosened, they can be soldered back to their original position unless they have physically snapped.

Interference Signals

Few things are more frustrating than looking at a "No Fob Detected" message when trying to start your vehicle. This usually occurs at the most awkward time, such as when you're running late for work or picking up children from daycare or school. There are some things you could try to figure out the root of the issue.

Interference signals can disrupt the remote key fob's signal to the vehicle, causing it to not function correctly. This can be caused from objects such as weather conditions, buildings, as well as transmitters operating on the same frequency. Interference could also occur if you have an aftermarket device installed in the vehicle that transmits on the same frequency as the key fob.

The key fob might be damaged if it is exposed to water or salty water. The rubber seals on the electronic chip can be damaged by water, especially if it is submerged for long periods of time, such as in a pool or at the beach. The chip can stop working and may require replacement of the keyfob. If you have a programmable key, you can clean the chip with isopropyl alcohol or an electronic cleaner to aid in its return to functionality. If this does not help, the chip is likely to be damaged and needs to be replaced.

Locking or Unlocking the Doors

The buttons on the fob's key send electronic signals to the solenoid in the car, which converts the signal into mechanical action. It locks and unlocks doors. If the door lock is not working, the problem could be a solenoid issue that requires some investigation by a professional auto repair shop.

A low-voltage battery can hinder the fob from functioning correctly. This can happen if the battery's charge is lost or if the contacts are corroded and stop transmitting electricity. The good news is that a new battery can solve this issue in only minutes.

The receiver module may be the problem if the key fob doesn't work after you replace the battery or reprogram the device. The device interprets radio frequency signals transmitted by the key fob to control the vehicle. It can be a costly repair if it becomes faulty.

To confirm if this true, place your spare key into the key slot. Then, turn the ignition ON. Press the key fob two times within 10 seconds, but without taking it out. The mazda key replacement 3 system synchronizes the key to the vehicle, and you can use it as your primary driving remote. This allows you to program up three keys.