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Changing the Battery in Your Mazda 3 Key Fob
It is frustrating to get in your car at the end of a long, hard day and discover that the key fob is dead. This is a simple solution that can be accomplished at a major box retailer or at a hardware store.
The addition of a spare key fob to your Mazda 3 can be an cost-effective way to stay away from the hassle of being driven to the dealership and having them reprogram your keys.
Battery Replacement
Change the battery in the Mazda 3 key fob is an easy task that you can do at home. However, you should only replace the battery if it is dead, or if the key fob displays a message on the multi-information display, "Low key fob battery. Replace battery."
To open mazda 3 keys casing you'll need a tape-wrapped flathead screwdriver, along with some patience. The head of the flathead screwdriver in a notch, or gap, on the bottom metal of the Mazda 3 key fob to cut off the lower half. 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's a slot the opposite side of the case, where you can find the battery. Make use of the tape-wrapped flathead screwdriver to gently the case open, starting on one side before moving to the other. Remove the old battery and put in the new CR2025 and make sure it's face-up for the correct polarity. Finally, put the cap of the battery back on and reattach both sides of the key fob case, pressing until you hear them click.
Once you've replaced your battery Test the fob to confirm it is working by locking and unlocking your doors. If everything looks good, your Mazda 3 remote features can be used again.
Pairing Issues
If your key fob stopped working suddenly it could be a sign that the transmitter in the car is damaged. It is typically a need for a professional to repair and will likely require a replacement key fob.
If you've tried replacing the battery and reprogramming the key fob, but it has not solved the problem, it is possible that the chip inside the key fob might be malfunctioning. This can happen if the keyfob was dropped or exposed to saltwater or handled by dirty fingers.
You'll need to find an extremely small "key" that is built into the seam, to remove the circuit board to identify the issue. You can then check the chip for damage or corrosion. It is best to use a clean paper towel to keep the microchip from being damaged.
You may also examine the battery connector's terminals and check if they're damaged or cracked. If this is the case it is possible to solder the terminals back to their original position will usually restore functionality to the key fob. In the same way, you can examine the buttons to determine whether they're worn or damaged. If the buttons are loose, they can easily be soldered back in place in the event that the button has actually snapped off.
Interference Signals
There's nothing more difficult than trying to start your car only to see the message "No Fob Detected". It can happen at the most unfavorable possible times, like when you're late for work or have to pick up your children from daycare/school. The good thing 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 to cease working properly. This could be caused by objects such as buildings, weather conditions 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 might be damaged if it is exposed to water or salty water. The rubber seals on the electronic chip may be damaged by water, particularly if it is submerged for long periods of time, such as in a pool or ocean at the beach. The chip may cease to function and may require replacement of the keyfob. If you own a programmable key, you can clean the chip using isopropyl alcohol or an electronic cleaner to help it come back to normal. If this does not help, the chip is likely to be damaged and needs to be replaced.
Locking/unlocking the Doors
The buttons on the fob's key send electronic signals to the solenoid of the car, which then transforms this signal into a mechanical action. This locks and unlocks doors. If the door lock isn't working, it could be a solenoid issue that requires some investigation with the assistance of a professional auto repair shop.
A dead 12 volt could also hinder the fob from working properly. This can occur if your battery fails to charge or if the contacts are damaged. The good news is that a new battery can solve this issue in only minutes.
The receiver module could be the cause of the issue if the key fob won't work after you replace batteries or reprogram the device. This device interprets radio frequency signals transmitted by the key fob to control the vehicle. It could be expensive to repair if it becomes faulty.
To test if this is 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 use it as your primary driving remote. You can program up to three keys this manner.