Changing the Battery in Your Mazda 3 Key Fob

There's nothing more annoying than stepping into your vehicle after a long day, and discovering that the key fob battery is dead. This is a simple fix that can be found at a big box retailer or at a hardware store.

Adding a spare key fob to your Mazda 3 can be an affordable solution to free yourself from having to be towed to the dealership and having them re-program your keys.

Battery Replacement

Changing the battery in your Mazda 6 Key Fob 3 key fob is a simple process that you can do at home. However, you should 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."

You'll need to use a flathead screwdriver, tape and patience to open the case. Find a gap or notch in the bottom portion of the metal of the 2011 mazda 3 key fob 3's key fob, and insert the head of the screwdriver to remove the lower part. Repeat the procedure for the top metal piece but be careful not to scratch the rubber ring on the bottom of the case.

Once the fob's case is open, you'll be able to see a slot on either side of the case, which houses the battery. Start on the opposite side of the case, and then gently lift it up. Remove the old CR2025 and replace it with a new one, making sure to place it face-up to ensure proper the polarity. Finally, put the battery cap back on and reattach both sides to the key fob's case. Continue pressing until you can hear them click.

After replacing the battery, test the fob to confirm it is working 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 may have been damaged. It's usually a job to a professional and you will require a brand new key fob.

If you've tried to replace the battery and reprogram the key fob but it's not working, the chip inside the key fob may be faulty. This can happen when the key fob has been dropped on hard surfaces and exposed to salt water, or even touched by dirty hands.

To identify the issue To determine the cause, you must find a small "key" that is embedded into the seam of the fob which allows you to take it apart and take out the circuit board. You can then check the chip for corrosion or damage. To prevent damaging the chip, it's recommended to use a clean paper towel.

You can also examine the battery connector terminals to determine if they're damaged or cracked. If this is the case then resoldering the terminals to their place will usually restore the functionality of the key fob. You can also examine the buttons for damage or wear. If the buttons are loose, they can easily be soldered back in place as well unless the button is physically snapped off.

Interference Signals

Few things are more frustrating than looking at an "No Fob Detected" message when you attempt to start your vehicle. This can happen at the most inconvenient situations, like when you're late to work or you're trying to collect your children from daycare or school. There are several things you can do to help figure out what's causing the problem.

Interference signals can cause the remote key fob to cease working in a proper manner. This can be caused from things like weather conditions, buildings as well as transmitters operating on the same frequency. Interference can occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob.

Additionally, if the key fob is exposed to water or salt waters, it could be damaged. The rubber seals on the chip's electronic components can be shattered by water, especially when it is submerged for an extended period of time, such as in a swimming pool or at the beach. The chip can stop working and require replacement of the keyfob. If you have a programmable key cleaning the chip using isopropyl alcohol or an electronic cleaner to aid in its return to functionality. If this does not work the chip, it is likely to be fried and will require to be replaced.

Locking and Unlocking of Doors

The buttons on the keys send electronic signals to a solenoid inside the car. It then converts that signal into a mechanical action that locks and unlocks doors. If the door lock fails to work, it could be an issue with the solenoid. This requires professionals from repair shops to analyze.

A dead 12 volt battery can also stop the fob from functioning properly. This could happen if your battery is not charged or if your contacts get corroded. The good news is that a new battery can fix this problem in just minutes.

The receiver module could be the cause of the issue if the key fob does not function after you replace the battery or program the device. This device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle. It could be expensive to repair if it is damaged.

To verify if this is true, put your spare key in the key slot. Then, turn the ignition ON. Press the key fob button three times within 10 seconds without removing it. The mazda 3 remote key 3 system will now connect the key to the car and you can use it as your primary remote for driving. You can program up to three keys this manner.