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Changing the Battery in Your Mazda 3 Key Fob
There is nothing more frustrating than getting to your vehicle after a long day and discovering that your key fob battery is dead. This is a straightforward fix that can be done at a major box retailer or at a hardware store.
Adding a spare key fob to your Mazda 3 can be an affordable way to keep yourself from having to be taken to the dealer 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. You should only replace it when the battery is dead or you notice a message stating "Low keyfob battery" on the multi-information display. Replace battery."
To open the key fob's case you'll need a tape-wrapped flathead screwdriver as well as some patience. Locate a notch or gap in the bottom of the metal part of your Mazda 3's key fob, and insert the head of the screwdriver into it to break off the lower half. Repeat the process for the top metal piece but be careful not to damage the rubber ring on the bottom of the case.
There's a slot both sides of the fob case, which houses the battery. Start on replace mazda key fob of the case, and then gently open it. Remove the old battery and put in the new CR2025, making sure that it's facing upwards to ensure the correct orientation. Place the battery cap on the other side and attach both sides of your key fob case by pressing until they click.
After you've replaced the battery Test the fob to verify that it works by locking and unlocking your doors. If everything looks good you're good to go. Mazda 3 remote features can be used again.
Pairing Issues
If your key fob has stopped working suddenly, this could indicate that the transmitter inside your car has been damaged. This is usually a matter to a professional and you will require a brand new key fob.
If you've tried replacing the battery and reprogram the key fob but it hasn't worked then the chip in the key fob could be defective. This can happen if your keyfob has been dropped or exposed to saltwater or was touched by dirty fingers.
You'll need to find the tiny "key", which is inserted into the seam, to remove the circuit board and determine the problem. Then, you will be able check for any corrosion or damage on the electronic chip. It is best to use a clean, dry paper 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 you can solder the terminals back into place will typically restore functionality to the key fob. Also, you can check the buttons to see whether they are worn out or damaged. If they are loose, they can be soldered back into place, unless one has physically snapped.
Interference Signals
There are few things more frustrating than trying to get the engine started in your car and seeing the message "No Fob Detected". It happens at the worst possible times, like when you're late for work or have to pick up your children from daycare or school. The good thing is that there are a few steps you can follow to resolve the issue and determine the cause.
Interference signals can affect the remote key fob signal coming from the vehicle which causes it to not work correctly. It can be caused by 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.
The key fob may also be damaged if it is exposed to salt water or water. The rubber seals on the electronic chip could be damaged by water, particularly in the event that it is submerged for long periods of time such as in a swimming pool or at the beach. The chip may 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 aid in its get back to its original functionality. If this doesn't work you can be sure that the chip has fried and needs to be replaced.
Locking and Unlocking of Doors
The key fob's buttons send electronic signals to a solenoid within the car that then transforms the signal into a mechanical action that locks and unlocks doors. If the door lock isn't working, the issue may be a solenoid issue that requires some analysis with the help of an expert repair shop for autos.
A dead 12 volt battery could also stop the fob from working properly. This is the case if the battery is unable to charge or the contacts are corroded and stop transmitting electricity. The good news is that a new battery can solve this issue in only minutes.
The receiver module may be the reason why the key fob does not function after replacing the battery or program the device. This device interprets radio frequency signals sent by the key fob to control the vehicle. It could be a costly repair if the device becomes defective.
To check if this is the case, start by inserting your spare keys into the key slot and turning the ignition to ON. Press the key fob two times within 10 seconds, but without removing it. The Mazda 3 system will now be able to synchronize the key with your car, and you can use it as your primary remote for driving. You can program up to three keys in this manner.