Changing the Battery in Your Mazda 3 Key Fob
There's nothing more frustrating than getting to your vehicle after a long work day and finding that the key fob battery is dead. Luckily, this is an easy fix with simple battery replacement from the hardware store or big box retailer.
The addition of a spare key fob to your Mazda 3 can be an cost-effective way to stay away from having to be taken to the dealer and having them reprogram your keys.
Battery Replacement
You can change the battery on your Mazda 3 keyfob at home. However, you should only replace the battery if it dies, or if the key fob shows a message on the multi-information display that reads, "Low key fob battery. Replace battery."
You'll need a flathead screwdriver with tape and patience to open the case. Insert the head of the flathead screwdriver in a notch or gap on the bottom of the metal of the Mazda 3 key fob to remove the lower part. Repeat this process for the top portion of the metal, but be careful not to damage the rubber ring at the bottom of the key fob's case.
Once the fob case has been open, you'll see the slot on either side of the case that houses the battery. Make use of the tape-wrapped flathead screwdriver to gently open the case, beginning with one side and moving to the opposite. Remove mazda 6 key fob replacement , and put in a new CR2025, making sure that it's in the right orientation for the correct polarity. Finally, place the cap on the battery and reattach both sides to the key fob case. Keep pressing until you hear them click.
After replacing the battery, lock and unlock your doors to test that the fob works. If everything is in order, you can start using the Mazda 3's remote features in the road!
Pairing Issues
If your key fob stops working suddenly it could be a sign that the transmitter inside your car has been damaged. This is usually a matter for a professional and you will require a new key fob.
If you've attempted to replace the battery and reprogram the key fob, but it's not working then the chip in the key fob may be faulty. This can happen if your keyfob has been dropped, exposed to saltwater, or the touch of dirty fingers.
You'll need the tiny "key" that is built into the seam, to take off the circuit board and identify the issue. Then, you will be able check for any damage or corrosion on the electronic chip. To avoid damaging the microchip, it is best to use a fresh paper towel.
It is also possible to examine the battery connector's terminals to see if they are cracked or broken. If this is the case it is possible to solder the terminals back into place will typically bring back functionality to the key fob. Similarly, you can inspect the buttons to see whether they're worn or damaged. If they are loose, they can be resoldered into position, unless they've physically snapped.
Interference Signals
There's nothing more difficult than trying to start your car and then seeing the message "No Fob Detected". This can happen at the most inconvenient situations, like when you're running late to work or when you have to pick up your children from daycare/school. There are several things you can do to help figure out the root of the issue.
Interference signals can affect the remote key fob signal coming from the vehicle which causes it to not function properly. This could be due to things like weather conditions, buildings and transmitters operating on the same frequency. Interference may also occur if you have equipment from an aftermarket manufacturer installed in the vehicle that transmits at the same frequency as the key fob.
Additionally, if the key fob is exposed to salt or the water, it might be damaged. The rubber seals on the electronic chip may be shattered by water, especially in the event that it is submerged for an extended period of time like in a pool or at the beach. The chip can stop working and may require replacement of the keyfob. If you have a programmeable key cleaning the chip with isopropyl Alcohol or an electronic cleaner to help it come back to normal. If this doesn't help you can be sure that the chip has been damaged and needs to be replaced.
Locking and Unlocking the Doors
The buttons on the fob's key send electronic signals to the solenoid inside the car, which transforms this signal into a mechanical action. It locks and unlocks doors. If your door lock isn't working it could be because of an issue with the solenoid. This requires professionals from repair shops to analyze.
A dead 12 volt battery could also stop the fob from functioning properly. This is the case if the battery is unable to charge or the contacts get corroded and stop transferring electricity. This issue can be resolved in a matter of minutes by replacing the battery.
The receiver module may be the cause of the issue if the key fob does not function after replacing batteries or reprogram the device. The device receives radio frequency signals from the key fob and interprets them into controlling the vehicle's functions. It can be a costly repair if it malfunctions.
To check whether this is the case, begin by inserting your spare key into the key slot and turning the ignition to ON. Press the key fob twice within 10 seconds, but without removing it. The Mazda 3 system will now be able to synchronize the key with your car and allow you to use it as your primary remote for driving. You can program up to three keys this way.