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Changing the Battery in Your Mazda 3 Key Fob
There's nothing more annoying than getting in your vehicle after a long day, and finding that the key fob battery is dead. Luckily, this is an easy fix with a simple battery replacement from an hardware store or a 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 re-program your keys.
Battery Replacement
You can change the battery on your Mazda 3 keyfob at home. However, you should replace the battery if it fails, or when the key fob displays a message in the multi-information display, "Low key fob battery. Replace battery."
To open the key fob case You'll need a tape wrapped flathead screwdriver and some patience. Locate a notch or gap in the bottom part of the metal of the Mazda 3's key fob, and then insert the head of the screwdriver to remove the lower portion. Repeat the procedure for the top piece of metal however, be careful not to damage the rubber ring on the bottom of the case.
When the fob case is open, you'll find a slot on either side of the case that houses the battery. Make use of the tape-wrapped flathead screwdriver to gently pry open the case, starting at one end and shifting to the other. Remove the old CR2025 and replace it with a brand new one, making sure that you put it on its face to ensure proper the polarity. Then, put the cap of the battery back on and reattach both sides of the key fob's case, pressing until you hear them click.
Once G28 've replaced your battery Test the fob to make sure it works by locking and unlocking your doors. If everything seems to be in good order the Mazda 3 remote features can be used again.
Pairing Issues
This could mean that the transmitter in your car may have been damaged. This is usually a matter of an expert repair and may require a new replacement key fob.
If you have tried replacing the battery and programming the key fob, but it does not solve the issue it could be that the chip inside the key fob could be faulty. This could happen if the key fob has been dropped on hard surfaces or exposed to saltwater or even brushed by dirty hands.
To diagnose this issue it is necessary to find a small "key" located in the edge of the fob which allows you to take it apart and take out the circuit board. You can then examine the electronic chip for corrosion or damage. It is recommended to use a clean paper towel to prevent damaging the microchip.
It is also possible to take a closer look at the battery connector terminals to see if they are damaged or cracked. If this is the situation then resoldering the terminals into place can usually restore functionality to the key fob. You can also examine the buttons for wear or damage. If the buttons are loose, they can be soldered back into position, unless they've physically snapped.
Interference Signals
There are few things more frustrating than looking at an "No Fob Detected" message when trying to start your car. This usually occurs at the most difficult time, such as the time you're late to work or when you are picking up your children from school/daycare. There are some things you can try to figure out what's causing the issue.
Interference signals can affect the remote key fob's signal from the vehicle, causing it to not work properly. This can be caused from things like weather conditions, buildings, and transmitters using the same frequency. Interference may occur if your vehicle is equipped with aftermarket equipment that transmits at the same frequency as your key fob.
Additionally, if the key fob is exposed to salt or water seawater, it may be damaged. The rubber seals on the electronic chip can be penetrated by water, especially in the event that it is submerged for long periods of time, such as in a pool or ocean at the beach. This could cause the chip to stop working and will require replacement of the key fob. If you have a key that has the ability to be programmed or programmed, you can clean it with isopropyl or electronic cleaners to bring it back to its original functionality. If this does nothing, it is likely that the chip is fried and will need to be replaced.
Locking/Unlocking of the Doors
The key fob's buttons send electronic signals to a solenoid inside the car. It converts the signal into a mechanical action that locks and unlocks doors. If your door lock isn't working, it could be an issue with the solenoid. This requires professionals from auto repair shops to examine.
A dead 12 volt battery can also stop the fob from functioning correctly. This could happen if the battery's charge is lost, or if the contacts get corroded and stop transferring electricity. The good news is that a new battery is able to solve this issue in only minutes.
The receiver module may be the problem if the key fob won't work after replacing the battery or program the device. The device interprets radio frequency signals received by the key fob to control the vehicle. It could be a costly repair if it becomes faulty.
To verify if this is true, place your spare key into the key slot. Then, turn the ignition ON. Press the key fob button two times in a matter of 10 seconds without removing it. The Mazda 3 system will now sync the key to the car and you can use it as your primary remote for driving. This lets you program up to three keys.