Changing the Battery in Your Mazda 3 Key Fob
There is nothing more frustrating than getting in your vehicle after a long day and realizing that the key fob battery is dead. Fortunately, it is an easy fix using a simple battery replacement from an hardware store or a big box retailer.
A spare key fob for your Mazda 3 is an inexpensive alternative to not having to take your vehicle by a dealership to let them re-program your keys.
Battery Replacement
Change the battery in your Mazda 3 key fob is a simple process that you can perform at home. You should only replace it when the battery fails or you notice a message stating "Low keyfob battery" on the multi-information display. Replace battery."
You'll need a flathead screwdriver and tape and patience to open the case. Locate a notch or gap in the bottom metal part of the Mazda 3's key fob and then insert the tip of the screwdriver into it to remove the lower part. Repeat this process for the top metal piece Be careful not to damage the rubber ring at the bottom of the key fob's case.
You'll find a slot on the opposite side of the case, where you can find the battery. Start on one side of the case, and then gently lift it up. Remove the old battery, and put in the new CR2025, making sure that it's face-up for proper orientation. Attach the cap to the battery the other side and attach both sides of your key fob case by pressing until they click.
After you've replaced the battery check the fob to make sure it's working by locking and unlocking your doors. If everything is in order then you're able to use your Mazda 3's remote capabilities to drive again!
Pairing Issues
If your key fob stops functioning suddenly, this could indicate that the transmitter in the 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 change the battery and reprogramme the key fob, but it hasn't worked the chip inside the key fob could be defective. This can happen if your keyfob has been dropped, exposed to saltwater, or the touch of dirty fingers.
You'll need to find the tiny "key", which is built into the seam to remove the circuit board and determine the problem. You can then examine the electronic chip for corrosion or damage. To avoid damaging the microchip, it is best to use a fresh paper towel.
It is also possible to take a closer look at the battery connector's terminals to examine if they're damaged or cracked. If mazda 2 key fob is the case, then carefully soldering them back in place will usually restore the function of the key fob. Also, you can check the buttons to see 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's nothing more frustrating than trying to get the engine started in your car only to see the message "No Fob Detected". It can happen at the most unfavorable occasions, such as when you're running late to work or you're trying to collect your children from daycare/school. The good thing is that there are a few steps you can take to troubleshoot the issue and figure out what is causing it.
Interference signals can cause the remote key fob to stop working in a proper manner. It can be caused by things like weather conditions, buildings and transmitters that operate on the same frequency. Interference can occur when your vehicle has aftermarket equipment that transmits at the same frequency as your key fob.
The key fob could be damaged if it is exposed to salt water or water. Water can penetrate the rubber seals of the electronic chip, particularly if the key fob is submerged in water for a long period of time. The chip may stop working and require replacement of the keyfob. If you have a key that can be programmed, you can clean it using isopropyl or electronic cleaners to bring it back to its original functionality. If this doesn't work the chip, it's likely fried and will need to be replaced.
Locking and Unlocking the Doors
The buttons on the key fob transmit electronic signals to the solenoid of the car, which then converts this signal into mechanical action. This locks and unlocks doors. If the door lock isn't working, the problem could be due to a solenoid problem that requires investigation by an expert repair shop for autos.
A dead battery of 12 volts can cause the fob to stop functioning properly. This happens when the battery loses charge, or if the contacts are corroded and stop transmitting electricity. The good news is that a new battery is able to solve this issue in only minutes.
The receiver module may be the cause of the issue if the key fob doesn't work after you replace batteries or reprogram the device. The device receives radio frequency signals from the key fob and interprets them into controlling the functions of the vehicle. If it malfunctions it could be costly to repair.
To check whether this is the case, start by putting your spare key into the key slot and turning the ignition to ON. Press the key fob twice for 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. You can program up to three keys in this way.