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Changing the Battery in Your Mazda 3 Key Fob
It's a pain to get into your car at the end of a long day and find that the key fob is dead. Fortunately, this is an easy fix with a simple battery replacement from an electronics store or big box retailer.
A spare key fob to your Mazda 3 can be an affordable solution to free yourself from having to be transported to a dealership and having them re-program your keys.
Battery Replacement
Removing the battery from your Mazda 3 key fob is a simple process that you can do at home. You should only replace it if the battery dies or if you get a message that reads "Low keyfob battery" on the multi-information display. Replace battery."
To open the case of your key fob, you'll need a tape-wrapped flathead screwdriver and a bit of patience. Locate a notch or gap in the bottom portion of the metal of the Mazda 3's key fob, and insert the head of the screwdriver into it to cut off the lower portion. Repeat the procedure for the top piece of metal however, be careful not to scratch the rubber ring that is on the bottom of the case.
There is a slot on each side of the case, where you can find the battery. Start on the opposite side of the case, and then gently push it open. Remove the old CR2025 and replace it with a new one, making sure you put it on its face to ensure proper the polarity. Place the battery cap on the other side and attach both sides of your key fob case by pressing until they click.
Once you've replaced your battery, test the fob to make sure it works by locking and unlocking your doors. If everything appears to be working, you can start using your Mazda 3's remote features on the road again!
Pairing Issues
If your key fob has stopped suddenly it could be a sign that the transmitter inside your car is damaged. This usually requires an expert repair and may need a new key fob.
If you've attempted to replace the battery and reprogramme the key fob, but it hasn't worked the chip inside the key fob might be defective. This can happen if the key fob has been dropped on hard surfaces, exposed to salt water or even brushed by dirty hands.
To diagnose this issue it is necessary to locate a tiny "key" built into the fob's seam which allows you to open it and remove the circuit board. Then, you can check the electronic chip for damage or corrosion. It is best to use a clean, dry paper towel to keep the microchip from being damaged.
You may also take a closer look at the battery connector's terminals to examine if they're damaged or cracked. If this is the case then resoldering the terminals into place can 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 easily be soldered back into place and also if the button has actually snapped off.
Interference Signals
There are few things more frustrating than trying to get the engine started in your car and then seeing the message "No Fob Detected". This can happen at the most inconvenient time, for instance the time you're late to work or pick up your children from school/daycare. The good news is that there are a few steps you can follow to resolve the issue and determine what is causing it.
Interference signals can cause the remote key fob to stop working in a proper manner. This could 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 can also be damaged if exposed to salt water or water. The rubber seals on the electronic chip could be penetrated by water, particularly when it is submerged over long periods of time such as in the ocean or a pool at the beach. The chip could stop working and may require replacement of the keyfob. If you have a programmable key it is possible to clean the chip with isopropyl Alcohol or an electronic cleaner to help it return to functionality. If this doesn't help you can be sure that the chip has burned out and needs to be replaced.
Locking/unlocking the Doors
The key fob's buttons send electronic signals to a solenoid in the car. It then converts the signal into a mechanical action that locks and unlocks doors. If your door lock fails to work it could be because of an issue with the solenoid. This requires expert auto repair shops to examine.
A dead battery of 12 volts can also stop the fob from functioning correctly. This can occur if your battery fails to charge or if the contacts are corroded. The good news is that a new battery is able to solve this issue in only minutes.
If the key fob isn't working after you replace the battery or reprogram it the problem could be related to the receiver module. This device receives radio frequency signals from the key fob and interprets them into controlling the vehicle's functions. It can be expensive to repair if it becomes faulty.
To determine if mazda 6 key fob is the case, start by inserting your spare key into the key slot and turning the ignition to ON. Press the key fob two times for 10 seconds without removing it. The Mazda 3 system synchronizes the key with the vehicle, so you can now use it as your primary driving remote. This allows you to program up three keys.