How to Add, Change, and Reprogram a Mazda 3 Spare Key
It's a good idea always to keep an extra key on hand regardless of whether you lost the keyfob or it was unable to function. This article will provide everything you need to learn about the process of adding, changing, and reprogramming your Mazda 3 key fobs.
A word of caution Some keys require programming by a professional locksmith or dealer, whereas others do not. Only use authentic
mazda 5 key fob replacements to replace your key fob.
How do I add a spare key?
You can also add a second key if you don't have a spare key or when you accidentally damage the one you have. To do this, you'll need a small flathead screwdriver and an CR2025 battery that's new. Once you've got all the equipment, it is time to open the key fob. First find the auxiliary key release button. It's located underneath the metal portion and is easy to locate. The back cover should come off when you press the button. Next, insert the screwdriver's head into the notch or space at the top of the metal piece and pry it off.
Once the auxiliary key has been removed, insert the new or spare key into the slot. Set the ignition to ON and wait for about five seconds before turning it to off. This will allow the system to recognize the new key and begin your vehicle in the future.
It's important to note that you can only program up to three keys on your Mazda 3. You don't want to have to use more than two key fobs in order to start your vehicle. This is a safety precaution designed to stop unauthorized users, such as valet drivers, from activating your key and starting your vehicle.
How to
Reprogram a spare key
If you have a spare key it's a good idea be aware of how to reprogram it in case your original key gets lost or stolen. This will stop unauthorized persons from stealing your car and starting it. This procedure should work with any Mazda however, you'll require two working keys to start the reprogramming. If you don't have two keys that work then it's best to bring your car to a dealer to have this done.
Begin by getting into your driver's seat and shutting the door, excluding for the one that's already opened. Turn the ignition on and then insert the first working key. Take five seconds before removing the key. Repeat the process with the second key.
Once you've completed programming your new key, you'll have 3 keys that be able to start your car in the future. Before placing each key in storage, make sure that it's functioning properly.
It's a good idea to purchase a spare
mazda replacement keys 3 key fob, especially if your car is one who has a tendency to lose their keys or has other issues with it. It's possible to find one on the internet or at your local automotive retailer, but make sure to read the reviews before purchasing so that you can avoid getting the wrong key fob compatible with your vehicle.
How to change the battery using a spare key
There's nothing worse than finding that the battery in your key fob has died and you can't unlock your vehicle. It's easy to change the battery yourself and save money at the dealer.
Press the auxiliary button on the back of the keyfob. This will release the metal key that is used as an auxiliary key, and expose two slots on the sides of the case. Use the screwdriver's flathead to push it into one of these slots and then gently remove the two sides of the case. When the battery is fully exposed, take it out of the case and put it in a place where you won't forget about it.
Make sure you have a new battery ready prior to starting. They can be bought at any store selling batteries or from a Mazda dealer in Winter Garden. Using the correct type of battery will ensure that your key fob operates effectively.
Replace the cap of the battery and then put in the new battery. Be careful not to scratch the rubber ring that holds the battery. Press the two halves together until you can hear the click.
How do I reset the Keyless Entry System
The key fob inside your Mazda 3 is not only an added convenience, but it's also an important security feature. If you lost your key or had it stolen the car won't start, even if you have the spare fob. This is because the fob that you have to be reprogrammed at the dealership in order to function properly. This can be a costly and time-consuming process, so it's a good idea to learn how to reset the system yourself.
Disconnect the battery from the system for 15 minutes. This will erase any residual electrical power in the on-board computer. Then, disconnect the LF-ECU connector as well as the demand switch connectors. Check for continuity between the following terminals:
Put the key in the slot, and turn on the ignition. Put the key in for about five seconds and
reprogram then switch it off. The key's details are now transferred to the computer of your vehicle and the new fob will start your car. You can program up to three fobs, but you must only use one at a time. This will stop unauthorised people from copying the key and getting ahold of your car. You can purchase a brand new key fob online, however you'll still need to go to a dealer or locksmith to get it cut and programmed.
