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Changing the Battery in Your Mazda 3 Key Fob
It can be a bit frustrating to pull into your car at the end of a long, hard day and find that the key fob is dead.
www.g28carkeys.co.uk is a simple fix that can be found at a major box retailer or at a hardware store.
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 re-program your keys.
Battery Replacement
You can replace the battery on your Mazda 3 keyfob at home. But, you should only replace the battery if it goes out of service, or if the key fob displays a message on the multi-information display stating, "Low key fob battery. Replace battery."
To open the key fob case You'll need a tape wrapped flathead screwdriver, along with some patience. Put the head of the flathead screwdriver into a notch, or gap in the bottom part of the Mazda 3 key fob to cut off the lower half. Repeat this step for the top part of the metal, but be careful not to damage the rubber ring on the bottom of the key fob's case.
There's a slot both sides of the fob case, where you can find the battery. Start on the opposite side of the case and then gently pry it open. Remove the old CR2025 and replace it with a new one, making sure you place it face-up to ensure the correct direction of polarity. Finally, place the cap back on and reattach both sides to 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 ensure whether the fob works. If everything is in order you're now able to use your Mazda 3's remote capabilities in the road!
Pairing Issues
This could indicate that the transmitter in your car has been damaged. This usually requires an expert repair and will likely need a new key fob.
If you have tried replacing the battery and reprogramming the key fob, but this has not solved the problem it is possible the chip in the key fob may be faulty. This could be the case if the keyfob was dropped or exposed to saltwater or handled by dirty fingers.
To determine the cause of the issue, you will need to locate a small "key" embedded in the seam of the fob that allows you to open it and remove the circuit board. You can then examine the chip for damage or corrosion. To avoid damaging the microchip, it is best to use a fresh paper towel.
If you're not sure it is possible to check the battery connector terminals for cracks, or breaks. If this is the case, then carefully attaching them back can often restore the function of the key fob. Additionally, you can look at the buttons to determine whether they've been worn out or damaged. If the buttons are loose they can be soldered back into place unless one has physically snapped.
Interference Signals
There are few things more frustrating than trying to get the engine started in your car only to see the message "No Fob Detected". This happens at the worst occasions, such as when you're late to work or have to pick up your children from daycare or school. The good thing is that there are steps you can take to investigate the issue and figure out what is causing it.
Interference signals can affect the remote key fob's signal to the vehicle, causing it to not work properly. This can be caused by objects such as buildings, weather conditions, and transmitters that operate on the same frequency. Interference can occur if your vehicle has aftermarket equipment that transmits at the same frequency as your key fob.
The key fob might be damaged if it is exposed to salt water or water. The rubber seals on the electronic chip may be shattered by water, especially when it is submerged over an extended period of time like in a pool or at the beach. The chip may cease to function and require replacement of the keyfob. If you have a key that has the ability to be programmed, you can clean it using isopropyl or electronic cleaners to bring it back to its original functionality. If this doesn't help the chip, it's likely to be damaged and will need to be replaced.
Locking/Unlocking of the Doors
The buttons on the keys send electronic signals to the solenoid inside the car. It 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 will require professional repair shops to analyze.
A dead 12 volt battery could hinder the fob from functioning correctly. This can happen if the battery loses charge or if the contacts become corroded, and stop transferring electricity. This issue can be solved in minutes with a new battery.
The receiver module could be the cause if the key fob isn't working after you replace the battery or program the device. This device receives radio frequency signals from the key fob and interprets them to control the vehicle's functions. It could be a costly repair if it becomes faulty.
To determine if this is correct, place your spare key into the key slot. Then turn the ignition ON. Press the key fob twice for 10 seconds without taking it out. The Mazda 3 system will now synchronize the key with the car and allow you to use it as your primary remote for driving. You can program up to three keys this manner.