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Changing the Battery in Your Mazda 3 Key Fob
It can be a bit frustrating to pull into your car at the end of a long, hard day and discover that your key fob is dead. This is a simple fix that is easily done at a big box retailer or at a hardware store.
A spare key fob for your Mazda 3 is an inexpensive option to not have to take it to a dealership to have them re-program the keys.
Battery Replacement
Changing the battery in your Mazda 3 key fob is a simple process that you can do at home. You should only replace it if the battery is dead or you see a message saying "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 and some patience. Put the flathead screwdriver's head in a notch, or gap on the bottom metal of the Mazda 3 key fob to take off the lower portion. Repeat this procedure for the top metal part, but be careful not to damage the rubber ring at bottom of the key fob's case.
There's a slot on the opposite side of the case that contains the battery. Use the flathead screwdriver with tape to gently open the case, beginning on one side and then shifting to the other. Remove the old CR2025 and replace it with a new one, making sure you put it on its face to ensure the correct orientation. Install the cap on the battery again, and then attach both sides of your key fob case by pressing until they click.
After replacing the battery, lock and unlock your doors to test whether the fob works. If everything appears to be working, your Mazda 3 remote features can be used again.
Pairing Issues
If your key fob stopped suddenly it could mean that the transmitter inside the car is damaged. This is usually a matter for a professional, and you will require a brand new key fob.
If you've tried replacing the battery and reprogramming the key fob, but it isn't solving the issue it is possible the chip in the key fob may be defective. This can happen if the key fob has been dropped on hard surfaces or exposed to salt water or even touched by dirty hands.
You'll need to find the small "key" that is inserted into the seam, to remove the circuit board and identify the issue. You will then be able to examine for any damage or corrosion on the electronic chip. To avoid damaging the microchip, it is recommended to clean the chip with a new paper towel.
If you're unsure, you can also check the battery connector's terminals for cracks, or breaks. If this is the situation you can solder the terminals back into place can usually bring back functionality to the key fob. Similarly, you can inspect the buttons to see whether they are worn out or damaged. If the buttons are loose, they can be soldered back in place in the event that the button is physically snapped off.
Interference Signals
There's nothing more difficult than trying to start your car only to see the message "No Fob Detected". It can happen at the most unfavorable occasions, such as when you're late to work or have to pick up your children from daycare or school. The good news is that there are a few steps you can take to troubleshoot the issue and determine the cause.
Interference signals can disrupt the remote key fob's signal from the vehicle which causes it to not work correctly. This can be caused by objects like buildings, weather conditions and transmitters that use the same frequency. Interference may occur if your vehicle has aftermarket equipment that transmits at the same frequency as your key fob.
In addition, if the key fob is exposed to salt or water water it may be damaged. The rubber seals on the electronic chip could be shattered by water, especially when it is submerged for long periods of time like in a pool or ocean at the beach. This could cause the chip's function to cease and may require replacement of the key fob. If you have a programable key, you can clean the chip using isopropyl alcohol or an electronic cleaner to aid in its get back to its original functionality. If Highly recommended Reading doesn't help the chip, it is likely fried and will need to be replaced.
Locking and Unlocking the Doors
The buttons on the keys send electronic signals to a solenoid within the car. It converts the signal into a mechanical action that locks and unlocks the doors. If the door lock is not working, it may be a solenoid issue that requires some investigation with the assistance of an expert auto repair shop.
A dead 12 volt battery could also prevent the fob from functioning effectively. This could happen if the battery's charge is lost or if the contactors are corroded and stop transmitting electricity. The good news is that a new battery is able to solve this issue in only minutes.
If the key fob isn't functioning after changing the battery or try to re-program it then the problem may be in the receiver module. The device interprets radio frequency signals transmitted by the key fob to control the vehicle. If it fails, it can be expensive to fix.
To confirm if this true, insert your spare key into the key slot. Then, turn the ignition ON. Press the key fob two times in a period of 10 seconds, without taking it out. The Mazda 3 system synchronizes the key with the vehicle and you can use it as your primary driving remote. This lets you program up three keys.