Changing the Battery in Your Mazda 3 Key Fob

There's nothing more annoying than getting in your vehicle after a long work day and realizing that the key fob battery is dead. Fortunately, this is an easy fix with simple battery replacement from an hardware store or a big box retailer.

A spare key fob for your Mazda 3 is an inexpensive way to avoid having to take it to a dealership in order to have them re-program your keys.

Battery Replacement

The battery replacement in your Mazda 3 key fob is a simple process that you can perform at home. You should only replace it when the battery is dead or you get a message that reads "Low keyfob battery" on the multi-information display. Replace battery."

To open the key fob's casing it requires a tape-wrapped flathead screwdriver and a bit of patience. Put the flathead screwdriver's head in a notch or gap in the bottom part of the mazda 6 key fob 3 key fob to remove the lower part. Repeat this step for the top part of the metal however, be careful not to damage the rubber ring on the bottom of the key fob's case.

Once the fob's case is open, you'll find the slot on either side of the case that houses the battery. Make use of the tape-wrapped flathead screwdriver to gently pry the case open, beginning on one side before moving to the next. Remove the battery that was used and place in a new CR2025, making sure that it's facing upwards to ensure proper orientation. Attach the cap to the battery the other side and attach both sides of your key fob case by pressing until they click.

After replacing the battery, lock and unlock your doors to verify whether the fob works. If everything is working you're now able to use the mazda transponder key programming 3's remote functions to drive again!

Pairing Issues

If your key fob has stopped functioning suddenly it could mean that the transmitter inside your car has been damaged. This is usually a matter of an expert to repair it and will likely require a new replacement key fob.

If you've tried replacing the battery and reprogram the key fob, but it hasn't worked it is possible that the chip inside the key fob may be defective. This can happen if the keyfob has been dropped, exposed to saltwater, or the touch of dirty fingers.

You'll need to locate the small "key", which is inserted into the seam to remove the circuit board and diagnose the issue. Then, you can check the chip for damage or corrosion. To prevent damaging the microchip, it is recommended to use a clean paper towel.

It is also possible to examine the battery connector's terminals to examine if they're damaged or cracked. If this is the case you can solder the terminals back to their place will usually restore the functionality of the key fob. You can also check the buttons for wear or damage. If the buttons are loose, they can be soldered back and also if the button has actually snapped off.

Interference Signals

Few things are more annoying than staring at a "No Fob Detected" message when trying to start your car. This happens at the worst possible times, like when you're running late to work or when you have to pick up your children from daycare/school. The good news is that there are steps you can take to troubleshoot the issue and figure out the root of the problem.

Interference signals can affect the remote key fob's signal from the vehicle making it unable to function correctly. This can be caused by things like buildings, weather conditions, and transmitters that use the same frequency. Interference could also occur if you have an aftermarket device installed in the vehicle that transmits on the same frequency as the key fob.

The key fob can also be damaged if it is exposed to water or salty water. The water can penetrate the rubber seals of the electronic chip especially when the key fob is submerged in water for a long time. This could cause the chip to stop functioning and will require replacement of the key fob. If you have a programmable key it is possible to clean the chip using isopropyl alcohol or an electronic cleaner to help it come back to normal. If this doesn't help will be able to fix the issue, then the chip has fried and needs to be replaced.

Locking or Unlocking 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 the doors. If the door lock is not working, it could be a solenoid malfunction that requires some analysis with the help of a professional auto repair shop.

A dead 12 volt battery can hinder the fob from functioning correctly. This is the case if the battery's charge is lost, or if the contacts are corroded and stop transmitting electricity. This issue can be resolved within a few minutes using a new battery.

The receiver module may be the problem if the key fob doesn't work after replacing the battery or reprogram the device. This device detects radio frequency signals sent by the key fob to control the vehicle. It could be expensive to repair if it becomes faulty.

To confirm if this true, place your spare key into the key slot. Then turn the ignition on. Press the key fob button two times within 10 seconds without taking it. The 2016 mazda 6 key fob programming 3 system will now be able to synchronize the key with your car and allow you to use it as your primary remote for driving. This lets you program up three keys.