Changing the Battery in Your Mazda New Key 3 Key Fob

It can be a bit frustrating to drive off at the end of a long day and discover that your key fob is dead. Fortunately, this is an easy fix with simple battery replacement from an hardware store or a big box retailer.

A spare key fob for your Mazda 3 is an inexpensive way to avoid having to take it to a dealer to have them re-program the keys.

Battery Replacement

The battery replacement in your Mazda 3 key fob is an easy procedure that you can do at home. You should only replace it if the battery fails or you notice a message stating "Low keyfob battery" on the multi-information display. Replace battery."

To open the key fob's casing, you'll need a tape-wrapped flathead screwdriver and some patience. Insert the flathead screwdriver's head 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 part of the metal but be careful not to scratch the rubber ring at bottom of the key fob's case.

Once the fob's case is opened, you'll notice the slots on either side of the case that houses the battery. Start on the other side of the case, and then gently open it. Remove the battery that was used and place in the new CR2025 to ensure that it's face-up for the correct polarity. Then, put the cap on the battery and reattach both sides of the key fob's case. Continue pressing until you hear them click.

After replacing the battery Check the fob to confirm it works by locking and unlocking your doors. If everything seems to be in good order then your mazda key cut 3 remote features can be used again.

Pairing Issues

If your key fob stops suddenly it could be because the transmitter inside the car is damaged. This is usually a matter for a professional and you will require a brand new key fob.

If you've tried to change the battery and reprogramme the key fob, but it hasn't worked, the chip inside the key fob may be faulty. This could happen if the keyfob was dropped or exposed to saltwater or touched by dirty fingers.

To diagnose this issue, you will need to locate a tiny "key" built into the seam of the fob that allows you to take it apart and take out the circuit board. Then, you will be able to check for any corrosion or damage on the electronic chip. It is recommended to use a clean towel to ensure that the chip is not damaged.

If you're not sure then you should also examine the battery connector's terminals for cracks or broken. If this is the case, carefully connecting them back can generally restore the functionality of the key fob. You can also examine the buttons for damage or wear. If the buttons are loose, they can be resoldered into position, unless they've physically snapped.

Interference Signals

Few things are more frustrating than looking at an "No Fob Detected" message when trying to start your vehicle. This can happen at the most inconvenient situations, like when you're late to work or pick up your children from daycare/school. The good thing is that there are a few steps you can follow to resolve the issue and figure out the cause.

Interference signals can interfere with the remote key fob signal from the vehicle, causing it to not work properly. This can be caused by things such as buildings, weather conditions, and transmitters that operate on the same frequency. Interference can also occur if you have aftermarket equipment installed in the vehicle that transmits at the same frequency as the key fob.

In addition, if the key fob is exposed cost to replace mazda key fob salt or 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 the ocean or a pool at the beach. The chip may cease to function and require replacement of the keyfob. If you have a programmable key you can clean the chip using isopropyl alcohol or an electronic cleaner to help it come back to normal. If this does not work the chip, it's likely to be fried and will require to be replaced.

Locking or Unlocking the Doors

The buttons on the key fob transmit electronic signals to the solenoid inside the car that then converts that signal into a mechanical action that locks and unlocks doors. If your door lock isn't working it could be because of an issue with the solenoid. This will require professional auto repair shops to investigate.

A dead 12V battery can also prevent the fob from working properly. This could happen if the battery's charge is lost, or if the contacts become corroded, and stop transferring electricity. The good news is that a new battery can solve this issue in only minutes.

The receiver module could be the cause of the issue if the key fob won't work after replacing batteries or reprogram the device. The 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 inserting your spare keys into the key slot and turning the ignition to ON. Press the key fob twice within 10 seconds without taking it. The 2009 mazda 6 key fob 3 system synchronizes the key with the vehicle, so you can use it as your primary driving remote. This lets you program up to three keys.