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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 your key fob is dead. Luckily, this is an easy fix by purchasing the simple replacement of a battery at the hardware store or big box retailer.
A spare key fob for your Mazda 3 is an inexpensive alternative to not having to be towed to a dealer to have them re-program the keys.
Battery Replacement
Changing the battery in the Mazda 3 key fob is an easy process that can do at home. It is recommended to replace it when the battery fails or you see a message saying "Low keyfob battery" on the multi-information display. Replace battery."
You'll need to use an flathead screwdriver along with tape and patience to open the case. Find replacement mazda key or notch in the bottom part of the metal of the Mazda 3's key fob, and insert the head of the screwdriver to break off the lower half. Repeat this step for the top metal part, but be careful not to scratch the rubber ring on the bottom of the key fob's case.
There's a slot the opposite side of the case that contains the battery. Use the flathead screwdriver with tape to gently the case open, starting on one side before moving to the other. Remove the old battery and put in a new CR2025 ensure that it's face-up for the correct polarity. Place the battery cap 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 verify whether the fob is working. If everything appears to be working then you can begin using the Mazda 3's remote functions in the road!
Pairing Issues
This could be a sign that the transmitter in your car is damaged. This is usually a matter of an expert to repair it and will likely need a new key fob.
If you've tried to change the battery and reprogram the key fob, but it hasn't worked then the chip in the key fob could be faulty. This can happen if your keyfob was dropped or exposed to saltwater or touched by dirty fingers.
To diagnose this issue, you will need to find a small "key" located in the edge of the fob that lets you open it up and take out the circuit board. You will then be able to examine for any corrosion or damage on the electronic chip. To prevent damaging the chip, it's recommended to use a clean paper towel.
You may also inspect the battery connector's terminals to see if they are damaged or cracked. If this is the case, then carefully attaching them back can usually restore the function of the key fob. It is also possible to check the buttons for wear or damage. If the buttons are loose, they can easily be soldered back into place in the event that the button is actually snapped off.
Interference Signals
There are few things more frustrating than glancing at an "No Fob Detected" message when trying to start your vehicle. This typically happens at most inconvenient moments, such as when you are late for work or if you're picking up kids from daycare/school. The good news is that there are steps you can take to pinpoint the issue and determine the root of the problem.
Interference signals can cause the remote key fob not to function in a proper manner. This can be caused by things like weather conditions, buildings, and transmitters that operate on the same frequency. Interference could occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob.
The key fob may also be damaged if exposed to salt water or water. The rubber seals on the electronic chip can be penetrated by water, particularly if it is submerged for an extended period of time like in a swimming pool or at the beach. This could cause the chip to stop working and require replacement of the key fob. If you have a programable key, you can clean the chip using isopropyl alcohol or an electronic cleaner to aid in its come back to normal. If this doesn't help will be able to fix the issue, then the chip has burned out and must be replaced.
Locking or Unlocking the Doors
The buttons on the fob's key send electronic signals to the solenoid of the car, which then converts this signal into mechanical action. It locks and unlocks doors. If the door lock is not working, the issue could be a solenoid malfunction that requires some investigation with the help of an expert repair shop for autos.
A dead 12 volt battery could cause the fob to stop working effectively. This could happen if the battery is unable to charge or if the contacts get corroded and stop transferring electricity. The good news is that a new battery can fix this issue in just minutes.
The receiver module may be the cause if the key fob does not function after you replace the battery 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 could be expensive to repair if the device becomes defective.
To determine whether this is the case, begin by inserting the spare key into the key slot and setting the ignition to ON. Press the key fob two times in a period of 10 seconds, without removing it. The Mazda 3 system synchronizes the key to the vehicle and you can now use it as your primary driving remote. You can program up to three keys this way.