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Changing the Battery in Your Mazda 6 key 3 Key Fob

It's a pain to get into your car at the end of a long day and discover that your key fob is dead. Luckily, it's an easy fix using a simple battery replacement from the hardware store or big box retailer.

Incorporating a spare key fob to your Mazda 3 can be an affordable solution to free yourself 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 when it dies, or if the key fob displays a message in the multi-information display saying, "Low key fob battery. Replace battery."

To open the key fob's case, you'll need a tape-wrapped flathead screwdriver as well as some patience. Put the flathead screwdriver's tip in a notch or gap on the bottom metal of the Mazda 3 key fob to take off the lower portion. Repeat the process for the top portion of the metal but be careful not to damage the rubber ring at the bottom of the key fob's case.

There's a slot on each side of the fob case, where you can find the battery. Use the flathead screwdriver with tape to gently open the case, beginning at one end and Mazda 6 Key moving to the next. Remove the battery that was used and place in a new CR2025 to ensure that it's facing upwards to ensure the correct polarity. Finally, place the cap on the battery and then reattach both sides of the key fob case. Keep pressing until you can hear them click.

After replacing the battery After replacing the battery, lock and unlock your doors to ensure whether the fob works. If everything looks good then your Mazda 3 remote features can be used again.

Pairing Issues

If your key fob has stopped working all of a sudden it could be because the transmitter in the car has been damaged. This is usually a matter of an expert to repair it and may need a new key fob.

If you've tried to change the battery and reprogram the key fob, but it hasn't worked then the chip in the key fob might be defective. This could happen if the keyfob was dropped or exposed to saltwater or handled by dirty fingers.

You will need to locate the tiny "key" that is built into the seam, to take off the circuit board and determine the issue. Then, you will be able to check for any corrosion or damage on the chip. To avoid damaging the chip, it is best to use a fresh paper towel.

You can also examine the battery connector terminals to see if they are cracked or broken. If this is the case, carefully connecting them back can often restore the function of 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 happens at the worst situations, like when you're late for work or pick up your children from school/daycare. The good news is that there are steps you can follow to resolve the issue and figure out the root of the problem.

Interference signals can cause the remote key fob to stop functioning in a proper manner. It can be caused by objects such as weather conditions, buildings, and transmitters operating on the same frequency. Interference can also occur if you have equipment from an aftermarket manufacturer installed in your vehicle that transmits at the same frequency as the key fob.

The key fob can also be damaged if it is exposed to salt water or water. Water can get into the rubber seals of the electronic chip, particularly when the key fob has been submerged in water for a prolonged duration. This could cause the chip's function to cease and require replacement of the key fob. If you have a programable key you can clean the chip with isopropyl Alcohol or an electronic cleaner to help it come back to normal. If this doesn't help the chip, it is likely fried and will need to be replaced.

Locking and unlocking of the Doors

The buttons on the key fob transmit electronic signals to the solenoid inside the car, which converts this signal into mechanical action. This locks and unlocks doors. If the door lock does not work it could be due to an issue with the solenoid. This requires professionals from repair shops to look into.

A dead 12 volt could also prevent the fob from functioning properly. This happens when the battery's charge is lost or if the contacts get corroded and stop transferring electricity. This issue can be solved in just a few minutes by purchasing a new battery.

The receiver module may be the problem if the key fob does not function after replacing batteries or reprogram the device. This device interprets radio frequency signals sent by the key fob to control the vehicle. It can be expensive to repair if it becomes faulty.

To verify if this is true, put your spare key in the key slot. Then turn the ignition on. Press the key fob twice in 10 seconds, without taking it out. The Mazda 3 system will now synchronize the key with the vehicle and you can then use it as your primary remote for driving. You can program up to three keys this manner.