Changing the Battery in Your Mazda 3 Key Fob
There is nothing more frustrating than getting in your vehicle after a long and tiring day and realizing that the key fob battery is dead. Fortunately, this is an easy fix with the simple replacement of a battery at the hardware store or big box retailer.
A spare key fob for your Mazda 3 is an inexpensive method to avoid having to take it by a dealership to let them re-program the keys.
Battery Replacement
Changing the battery in your Mazda 3 key fob is an easy task that you can perform at home. However, you should replace the battery when it fails, or when the key fob shows a message on the multi-information display, "Low key fob battery. Replace battery."
You'll need a flathead screwdriver, tape and patience to open the case. Find a gap or notch in the bottom metal part of the Mazda 3's key fob and then insert the tip of the screwdriver in it to cut off the lower half. Repeat this step for the top metal part, but be careful not to damage the rubber ring on the bottom of the key fob's case.
You'll find a slot on each side of the fob case that contains the battery. Start on the other side of the case and then gently push it open. Take out the old CR2025 and replace it with a brand new one, making sure that you place it face-up to ensure the correct direction of polarity. Finally, put the cap back on and reconnect both sides of the key fob case. Keep pressing until you hear them click.
After replacing the battery, test the fob to ensure it functions by locking and unlocking your doors. If everything appears to be working the Mazda 3 remote features can be used again.
Pairing Issues
This could indicate that the transmitter in your car may have been damaged. It's usually a task for a professional, and you will require a new key fob.
If you've tried replacing the battery and programming the key fob, but it does not solve the issue it could be that the chip in the key fob may be defective. This can happen when the key fob has been dropped on hard surfaces and exposed to salt water or even brushed by dirty hands.
To diagnose this issue it is necessary to locate a tiny "key" that is embedded into the seam of the fob that lets you open it up and take out the circuit board. Then, you can examine the chip for corrosion or damage. It is best to use a clean paper towel to prevent damaging the microchip.
If you're not sure, you can also check the battery connector's terminals for cracks or breaks. If this is the case, carefully soldering them back in place can usually restore the function of the key fob. It is also possible to check the buttons for wear or damage. If the buttons are loose, they can be resoldered 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 then seeing the message "No Fob Detected". It happens at the worst time, for instance the time you're late to work or have to pick up your children from daycare/school. There are some things you could do to troubleshoot and find out the root of the issue.
Interference signals can cause the remote key fob to cease working properly. This could be due to things like weather conditions, buildings, and transmitters that operate on the same frequency. Interference can 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 it may be damaged. The rubber seals on the electronic chip could be damaged by water, especially when it is submerged over an extended period of time, like in a pool or ocean at the beach. This can cause the chip's function to cease and require replacement of the key fob. If you have a key that has the ability to be programmed, you can clean it with isopropyl and electronic cleaners to restore its functionality. If this does nothing then it's likely that the chip is fried and must be replaced.
Locking/Unlocking of the Doors
The buttons on the key fob send electronic signals to a solenoid in the car. It converts that signal into mechanical action that locks and unlocks doors. If the door lock isn't working, the issue may be a solenoid issue that requires some investigation with the help of an expert auto repair shop.
A dead 12 volt battery could hinder the fob from functioning correctly. mazda 3 key replacement could happen if your battery is not charged or if your contacts become corroded. The good news is that a new battery can fix this problem in just minutes.
The receiver module may be the reason why the key fob isn't working after replacing the battery or program the device. The device receives radio frequency signals from the key fob and interprets them to control the functions of the vehicle. If it fails it could be costly to fix.
To determine whether this is the case, begin by inserting the spare key into the key slot and turning the ignition to ON. Press the key fob twice within 10 seconds without taking it. The Mazda 3 system synchronizes the key to the vehicle, and you can use it as your primary remote for driving. This lets you program up three keys.