Changing the Battery in Your Mazda 3 Key Fob
There's nothing more annoying than stepping into your car after a long work day and realizing that the key fob battery is dead. This is a simple fix that can be done at a major box retailer or at a hardware store.
The addition of a spare key fob to your Mazda 3 can be an affordable solution to free yourself from the hassle of being taken to the dealer and having them reprogram your keys.
Battery Replacement
Change the battery in the Mazda 3 key fob is a simple process that you can do at home. It is recommended to replace it if the battery dies or if you see a message reading "Low keyfob battery" on the multi-information display. Replace battery."
You'll need a flathead screwdriver, tape and patience to open the case. Find a gap or notch in the bottom of the metal part of the Mazda 3's key fob, and then insert the tip of the screwdriver to break off the lower half. Repeat the process for the top metal piece however, be careful not to scratch the rubber ring at the bottom of the case.
You'll find a slot on both sides of the fob case, where you can find the battery. Start with one side of the case, and then gently pry it open. Remove the old CR2025 and replace it with a new one, making sure to place it face-up to ensure proper polarity. Put the cap of the battery on again, and then 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 works. If everything is in order the Mazda 3 remote features can be used again.
Pairing Issues
If your key fob stopped suddenly it could be because the transmitter in the car has been damaged. This is usually a matter of an expert repair and may need a new key fob.
If you've tried replacing the battery and programming the key fob, but it isn't solving the issue, it is possible that the chip in the key fob may be faulty. This could happen if the key fob was dropped on hard surfaces or exposed to saltwater or even touched by dirty hands.
To determine the cause of the issue You will need to locate a tiny "key" that is embedded into the seam of the fob which allows you to take it apart and remove the circuit board. Then, you will be able check for any corrosion or damage on the chip. To avoid damaging the chip, it's recommended to use a clean paper towel.
You may also inspect the battery connector's terminals to examine if they're damaged or cracked. If this is the situation you can solder the terminals back into place will typically restore functionality to the key fob. Additionally, you can look at the buttons to determine if they are worn or damaged. If the buttons are loose, they can be re-soldered regardless of whether the button is physically snapped off.
Interference Signals
Few things are more frustrating than gazing at an "No Fob Detected" message when trying to start your car. This happens at the worst possible times, like when you're running late to work or have to pick up your children from school or daycare. The good news is that there are steps you can follow to resolve the issue and determine the cause.
Interference signals can cause the remote key fob not to function properly. This can be caused from things like weather conditions, buildings and transmitters that operate on the same frequency. Interference may also occur if you install aftermarket equipment in your vehicle that transmits at the same frequency as the key fob.
The key fob might be damaged if exposed to salt water or water. Water can damage the rubber seals of the electronic chip particularly if the key fob is submerged in water for an extended duration. This can cause the chip's function to cease and will require replacement of the key fob. If you have a key that has the ability to be programmed and cleaned using isopropyl or electronic cleaners to restore its functionality. If this does not work, the chip is likely to be damaged and will need to be replaced.
Locking/Unlocking the Doors
The buttons on the key fob transmit electronic signals to a solenoid within the car. It then converts the 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 expert auto repair shops to investigate.
A dead 12 volt battery could also prevent the fob from functioning properly. This is the case if the battery is unable to charge or the contacts become corroded and stop conducting electricity. This problem can be fixed in minutes with a new battery.
The receiver module may be the problem if the key fob doesn't work after replacing the battery or reprogram the device. The device interprets radio frequency signals received by the key fob to control the vehicle. If it malfunctions it could cost a lot to fix.
To confirm if this true, put your spare key in the key slot. Then turn the ignition ON. Press the key fob two times in a period of 10 seconds, without taking it out. The Mazda 3 system synchronizes the key to the vehicle, and you can now use it as your primary driving remote. mazda car keys lets you program up to three keys.