Changing the Battery in Your Mazda 3 Key Fob
It's frustrating to pull into your car at the conclusion of a long and tiring day and find that the key fob is dead. This is a simple fix that can be done at a major box retailer or hardware store.
A spare key fob for your Mazda 3 is an inexpensive way to avoid having to be towed by a dealership to let them reprogram the keys.
Battery Replacement
Removing the battery from your Mazda 3 key fob is a simple process that you can do at home. It is recommended to replace it when the battery goes out or if you see a message reading "Low keyfob battery" on the multi-information display. Replace battery."
To open the key fob's casing, you'll need a tape-wrapped flathead screwdriver, along with some patience. The flathead screwdriver's tip in a notch, or gap on the bottom of the metal of the Mazda 3 key fob to pry the lower half off. Repeat this procedure for the top part of the metal Be careful not to scratch the rubber ring at the bottom of the key fob's case.
You'll find a slot on both sides of the fob case that houses the battery. Start on the other side of the case and gently lift it up. Remove the battery that was used and place in a new CR2025, making sure that it's face-up for proper polarity. Then, put the cap back on and then reattach both sides of the key fob's case. Continue pressing until you hear them click.
Once you've replaced your battery Check the fob to make sure it's working by locking and unlocking your doors. If everything looks good the Mazda 3 remote features can be used again.
Pairing Issues
If your key fob has stopped working all of a sudden, this could indicate that the transmitter inside the car is damaged. This is usually a matter of an expert repair and may require a replacement key fob.
If you've tried replacing the battery and reprogram the key fob but it's not working the chip inside the key fob might be defective. This could happen if the key fob was dropped on hard surfaces or exposed to saltwater, or even touched by dirty hands.
You will need to locate the small "key" that is built into the seam, to take off the circuit board and diagnose the issue. You can then examine the electronic chip for corrosion or damage. To avoid damaging the chip, it's best to use a fresh paper towel.
You can also take a close look at the battery connector's terminals to see if they are cracked or broken. If this is the situation then resoldering the terminals to their original position will usually bring back functionality to the key fob. It is also possible to check the buttons for damage or wear. If the buttons are loose they can be resoldered into place unless one has physically snapped.
Interference Signals
There are few things more frustrating than staring at the "No Fob Detected" message when you attempt to start your vehicle. It typically happens at most awkward moments, such as when you're late for work or when you are picking up your children from daycare or school. There are some things you could try to figure out what's causing the problem.
Interference signals can interfere with the remote key fob's signal from the vehicle making it unable to function properly. This could be due to objects such as weather conditions, buildings as well as transmitters operating on the same frequency. Interference could also occur if you have an aftermarket device installed in the vehicle that transmits at the same frequency as the key fob.
In addition, if your key fob is exposed to water or salt waters, it could be damaged. mazda 2 key programming can penetrate the rubber seals of the electronic chip particularly if the key fob is submerged in water for a prolonged period of time. The chip may stop working and may require replacement of the keyfob. If you own a programmable key you can clean the chip with isopropyl Alcohol or an electronic cleaner to help it return to functionality. If this does nothing will be able to fix the issue, then the chip is fried and needs to be replaced.
Locking/Unlocking the Doors
The buttons on the key fob transmit electronic signals to the solenoid inside the car, which transforms the signal into mechanical action. It locks and unlocks doors. If the door lock isn't functioning, the issue could be due to a solenoid problem that requires some investigation with the help of a professional auto repair shop.
A dead 12V battery can also hinder the fob from functioning properly. This could happen if your battery fails to charge or if your contacts get corroded. This issue can be resolved in just a few minutes by purchasing a new battery.
If the key fob won't work after you replace the battery or program it again the problem could be with the receiver module. The device interprets radio frequency signals received by the key fob to control the vehicle. It can be a costly repair if it malfunctions.
To test if this is true, place your spare key in 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.