How to Fix Common Mazda 3 Key Problems
The Mazda 3 is an elegant compact car with a classy interior and a fluid handling. It's also an excellent value compared to many other compact cars on the market.
Lost keys can be a major issue. It can be expensive to replace keys that are lost, and driving your car to the dealer to re-program your key.
Keys not locking or unlocking doors
It is dangerous leaving doors unlocked especially when the vehicle is moving. If the door is opened when the vehicle is moving, it can cause passengers to fall out or be injured. Keep keys out of reach of children to avoid this problem. Children might find them interesting and play with them, which could cause the power windows or other controls to operate and even cause the vehicle to move.
If you notice the key fob doesn't unlock or lock the doors, the battery might be dead. The button-cell battery inside the keyfob has a limited lifespan, which is why it is important to replace it regularly. A quality battery should last between two to three years. When replacing the battery, it's important to use a battery with the same size and voltage as the original.
A problem with key pairing could also be the cause of your key fob not working. It is possible that the key fob was not paired correctly with the vehicle when it was first purchased. In this case the key fob will need to be reset by the dealership. Fortunately, this can be done in under a minute. The dealership can also reset the on-board computer to eliminate any remaining electric current. This won't fix the issue with the problem with your key fob's ability to lock or unlock doors.
Dead coin battery
It's possible that the battery is dead if your key fob doesn't turn on or unlock your car. This is a frequent issue, but it can be easily solved. You can replace the battery on your own, saving having to visit a dealership. The procedure is easy and requires only some tools.
Press the auxiliary key button located on the back of the Mazda flip key. This will let you take off the auxiliary keys made of metal. After the auxiliary key made of metal is removed, you'll find a slot on either side of the fob case. Make use of a tape-wrapped flathead screwdriver to break open the case starting with one side first and then the other. Gently break the two halves before putting them aside.
You can now replace the key fob's battery. Be careful not to damage the small rubber ring that the battery sits on. After the battery has been replaced, you can reassemble your case and take pleasure in the new key fob.
You can find batteries to replace at all stores that sell batteries. Search for a CR2025 battery. These batteries are commonly used in calculators and watches however they can also be found at auto parts stores or online. It's simple and fast to replace the battery in your Mazda 3. This will save you money and avoid an appointment with a dealer.
Key pairing issue
If you've been driving your Mazda 3 for a long time and suddenly it stopped working, there may be a problem in the remote keyless system receiver module. This is especially true when the key fob's internal chip is damaged. This can be caused by several factors, such as dropping or wetting the key.
The key fob's electronics are protected by rubber seals so a splash of rain shouldn't cause any damage. However, submerging mazda cx 9 key fob into swimming pool or ocean water can be an issue that is much more severe due to the highly conductivity of salt can cause damage to the electronics.
If your key fob has stopped functioning, you're most likely in need of new batteries. There are a wide range of third-party batteries available on the internet. It is important to keep in mind that these batteries might not work with your Mazda 3. It's a good idea to buy one from a dealer and make sure that it's 100% guaranteed to work with your vehicle.
After replacing the battery, you'll be able to use your key fob again. If the remote does not respond when you press the lock button, it's likely that the key is stuck in power saving mode. To get it out of this mode, you'll need to press the lock button five times, and hold it until the red light turns on.

Reprogramming the key
Mazda's keyless entry feature allows you to unlock the car and start it up without the requirement of a regular key. It's a great convenience but the process of programming the remote or key could be confusing for some people. It also requires a specific machine that only the dealer or automotive locksmith can access. This machine is connected to the computer in the vehicle, and it begins the programming procedure for the new key or remote.
The first step is to ensure that you have at least two working keys for the Mazda. You can then proceed to the reprogramming of a spare key. The functions of the new FOB will be temporarily turned off to protect the vehicle from theft. Once you have reprogrammed your new key, these functions can be activated once more.
After that, you can use the new key to open the doors and start the engine. It is important to test it first to ensure it works. Keep a spare set keys in case you are worried about losing your keys.
It is easy to add a spare Mazda key. Follow these steps and you can save a lot of cash by not having to pay a dealership to do it for you. This will save you money on towing costs and a spare key.