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Changing the Battery in Your Mazda 3 Key Fob
It's frustrating to get into your car at the end of a long day and discover that your key fob is dead. Fortunately, this is an easy fix by purchasing a simple battery replacement from a hardware store or big box retailer.
A spare key fob for your Mazda 3 is an inexpensive alternative to not having to take your vehicle to a dealership in order to have them reprogram the keys.
Battery Replacement
You can replace the battery on your Mazda 3 keyfob at home. But, mazda replacement key cost should only replace the battery if it fails, or when the key fob shows a message on the multi-information display, "Low key fob battery. Replace battery."
To open the key fob's casing You'll need a tape wrapped flathead screwdriver and a bit of patience. Locate a notch or gap in the bottom portion of the metal of the Mazda 3's key fob, and then insert the head of the screwdriver in it to pry off the lower half. Repeat this step for the top portion of the metal but be careful not to scratch the rubber ring at the bottom of the key fob's case.
Once the fob's case is opened, you'll notice an opening on either side of the case that houses the battery. Use the flathead screwdriver with tape to gently pry the case open, beginning on one side before moving to the other. Take out the old CR2025 and replace it with a new one, ensuring that you place it face-up to ensure the correct direction of polarity. Attach the cap to the battery again, and then attach both sides of your key fob case by pressing until they click.
Once you've replaced your battery Test the fob to verify that it is working by locking and unlocking your doors. If everything seems to be in good order, your Mazda 3 remote features can be used again.
Pairing Issues
This could mean that the transmitter inside your car has been damaged. It's usually a job to a professional and you will need a new key fob.
If you've tried to replace the battery and reprogramme the key fob but it hasn't worked, the chip inside the key fob could be faulty. This can occur if the key fob has been dropped on hard surfaces or exposed to saltwater, or even touched by dirty hands.
To determine the cause, you will need to find a small "key" built into the seam of the fob that lets you take it apart and remove the circuit board. You will then be able check for any damage or corrosion on the chip. To prevent damaging the microchip, it is best to use a fresh paper towel.
You can also inspect the battery connector's terminals and determine if they're damaged or cracked. If this is the case, soldering the terminals back to their place will usually restore functionality to the key fob. Similarly, you can inspect the buttons to see if they are worn or damaged. If the buttons are loose they can be resoldered into place unless one has physically snapped.
Interference Signals
There's nothing more difficult than trying to start your car only to see the message "No Fob Detected". This can happen at the most inconvenient situations, like the time you're late to work or pick up your children from daycare or school. There are some things you can do to find out the root of the issue.
Interference signals can interfere with the remote key fob's signal to the vehicle and cause it to not work properly. It can be caused by things like weather conditions, buildings and transmitters using the same frequency. Interference can also occur if you install aftermarket equipment in your vehicle that transmits on the same frequency as the key fob.
In addition, if the key fob is exposed to water or salt seawater, it may be damaged. Water can penetrate the rubber seals of the electronic chip particularly when the key fob has been submerged in water for a long time. This could cause the chip to stop functioning, requiring replacement of the key fob. If you have a programmable key, you can clean the chip using isopropyl alcohol or an electronic cleaner to aid in its get back to its original functionality. If this does not work, the chip is likely to be fried and will require to be replaced.
Locking and Unlocking the Doors
The buttons on the key fob transmit electronic signals to the solenoid in the car, which then converts the signal into mechanical action. This locks and unlocks doors. If the door lock fails to work it could be due to an issue with the solenoid. This will require professional auto repair shops to investigate.
A dead 12V battery can also prevent the fob from functioning effectively. This could happen if the battery has lost its charge or if the contacts become damaged. This problem can be fixed in minutes with a new battery.
The receiver module may be the cause of the issue if the key fob does not function after you replace the battery or re-program the device. This device receives radio frequency signals from the key fob and interprets them into controlling the vehicle's functions. It can be expensive to repair if it becomes faulty.
To confirm if this true, insert your spare key into the key slot. Then, turn the ignition on. Press the key fob twice in a period of 10 seconds, without removing it. The Mazda 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 in this way.