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 day and find that the key fob is dead. This is a simple solution that can be accomplished at a big box retailer or hardware store.
A spare key fob for your Mazda 3 is an inexpensive way to avoid having to be towed to a dealership in order to have them re-program your keys.
Battery Replacement
You can change the battery on your Mazda 3 keyfob at home. But, it is best to replace the battery when it dies, or if the key fob displays a message in the multi-information display, "Low key fob battery. Replace battery."
You'll need to use a flathead screwdriver and tape and patience to open the case. Place the head of the flathead screwdriver into a notch, or gap on the bottom metal of the Mazda 3 key fob to cut off the lower half. Repeat the procedure for the top metal piece Be careful not to scratch the rubber ring on the bottom of the case.
Once the fob's case is open, you'll find the slots on either side of the case that houses the battery. Make use of the tape-wrapped flathead screwdriver to gently pry the case open, starting on one side before shifting to the other. Remove the battery that was used and place in a new CR2025 to ensure that it's facing upwards to ensure the correct polarity. Then, put the cap back on and reconnect both sides of the key fob's case, pressing until you can hear them click.
Once you've replaced your battery check the fob to ensure it works by locking and unlocking your doors. If everything is in order then your Mazda 3 remote features can be used again.
Pairing Issues
If your key fob stop working suddenly it could be a sign that the transmitter inside your car is damaged. It's usually a task to a professional and you will require 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 that the chip inside the key fob could be damaged. This can happen if your keyfob has been dropped, exposed to saltwater, or touched by dirty fingers.
You will need to locate the tiny "key" that is built into the seam, to remove the circuit board and determine the issue. Then, you can check the chip for damage or corrosion. It is recommended to use a clean towel to keep the microchip from being damaged.
You may also examine the battery connector's terminals and determine if they're cracked or broken. If this is the case, carefully soldering them back in place can generally restore the functionality of the key fob. You can also inspect the buttons for damage or wear. If the buttons are loose, they can be re-soldered in the event that the button is actually snapped off.
Interference Signals
There is nothing more frustrating than staring at the "No Fob Detected" message when trying to start your car. It happens at the worst time, for instance when you're late for work or you're trying to collect your children from daycare/school. The good thing is that there are steps you can take to pinpoint the issue and figure out the cause.
Interference signals can interfere with the remote key fob signal coming from the vehicle making it unable to work correctly. This can be caused by things such as buildings, weather conditions, and transmitters that use the same frequency. mazda bt50 key replacement may also occur if you have an aftermarket device installed in your vehicle that transmits on the same frequency as the key fob.
In addition, if your key fob is exposed to salt or seawater, it may be damaged. The rubber seals on the chip's electronic components can be damaged by water, especially if it is submerged for long periods of time, like in a swimming pool or at the beach. The chip can stop working and require replacement of the keyfob. If you own a programmable key, you can clean the chip with isopropyl Alcohol or an electronic cleaner to aid in its return to functionality. If this doesn't work will be able to fix the issue, then the chip has been damaged and requires replacement.
Locking/unlocking the Doors
The key fob's buttons send electronic signals to the solenoid inside the car. It then converts that signal into a mechanical action that locks and unlocks the doors. If the door lock isn't working, the problem could be a solenoid malfunction that requires some investigation with the help of an expert repair shop for autos.
A dead battery of 12 volts can cause the fob to stop functioning properly. This can happen if the battery loses charge, or if the contacts become corroded, and stop transferring electricity. The good news is that a new battery is able to fix this issue in just minutes.
If the key fob won't work after you replace the battery or program it again the issue could be with the receiver module. This device detects radio frequency signals sent by the key fob to control the vehicle. If it malfunctions it could be costly to fix.
To confirm if this true, place your spare key in the key slot. Then turn the ignition on. Press the key fob twice within 10 seconds without taking it. The Mazda 3 system synchronizes the key with the vehicle and you can now use it as your primary driving remote. This allows you to program up to three keys.