Changing the Battery in Your Mazda 3 Key Fob

It's frustrating to drive off at the end of a long workday and discover that your key fob is dead. This is a simple fix that can be done at a major box retailer or hardware store.

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

Battery Replacement

Removing the battery from your mazda spare key 3 key fob is a simple process that you can do at home. However, you should only replace the battery if 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."

To open the key fob's case you'll need a tape-wrapped flathead screwdriver and a bit of patience. The flathead screwdriver's head in a notch or gap on the bottom metal of the Mazda 3 key fob to pry the lower half off. Repeat this procedure for the top metal piece however, be careful not to damage the rubber ring at the bottom of the key fob's case.

There is a slot on each side of the fob case, which houses the battery. Use the tape-wrapped flathead screwdriver how to fix mazda key fob gently open the case, starting with one side and moving to the opposite. Remove the old CR2025 and replace it with a new one, ensuring that you place it face-up to ensure the correct the polarity. Finally, place the cap of the battery back on and reattach both sides of the key fob case, pressing until you can hear them click.

After replacing the battery After replacing the battery, lock and unlock your doors to confirm that the fob is working. If everything looks good then you can begin using your mazda premacy key 3's remote capabilities in the road!

Pairing Issues

This could mean that the transmitter inside your car is damaged. It's usually a job that requires a professional. You will need a new key fob.

If you have tried replacing the battery and programming the key fob, but this did not resolve the issue it is possible the chip in the key fob may be damaged. 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 determine the cause of the issue, you will need to locate a tiny "key" built into the edge of the fob that lets you open it up and remove the circuit board. You can then examine the electronic chip for damage or corrosion. To prevent damaging the chip, it's best to use a fresh paper towel.

You may also examine the battery connector's terminals and examine if they're damaged or cracked. If this is the case then resoldering the terminals into place will typically restore functionality to the key fob. You can also check the buttons for damage or wear. If the buttons are loose, they can easily be soldered back in place in the event that the button is physically snapped off.

Interference Signals

There are few things more difficult than trying to start your car only to see the message "No Fob Detected". It happens at the worst possible times, like when you're late for work or have to pick up your children from school or daycare. The good news is that there are a few steps you can follow to resolve the issue and figure out what is causing it.

Interference signals can cause the remote key fob not to function in a proper manner. 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 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 water or salt the water, it might be damaged. Water can get into the rubber seals of the electronic chip, especially in the event that the key fob is submerged in water for a lengthy period of time. The chip may cease to function and require replacement of the keyfob. If you own a programmable key it is possible to clean the chip with isopropyl Alcohol or an electronic cleaner to help it return to working. If this does not work the chip, it is likely to be fried and will require to be replaced.

Locking and unlocking of the Doors

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

A dead 12V battery can also stop the fob from functioning properly. This could happen if the battery's charge is lost or the contacts are corroded and stop transmitting electricity. This issue can be resolved in minutes with a new battery.

The receiver module may be the cause of the issue if the key fob does not function after replacing the battery or re-program the device. This 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 becomes faulty.

To verify if this is true, insert your spare key in the key slot. Then turn the ignition on. Press the key fob button three times within 10 seconds without taking it. The Mazda 3 system synchronizes the key to the vehicle and you can use it as your primary driving remote. You can program up to three keys in this manner.