How to Add, Change, and Reprogram a Mazda 3 Spare Key
It's a good idea always to keep an extra key on hand in case you lose the keyfob or it has stopped working. This article will go over everything you must know about adding, changing, or changing the programming of your Mazda 3 key fobs.
A word of caution Certain keys require programming by a professional locksmith or dealer, whereas others don't. Make sure to make use of official Mazda replacements for your key fob.
How do I add a spare key?
You can add another key in the event that you don't have a spare key or if you accidentally damage the one you already have. You'll need to use a flathead screwdriver, and a CR2025 new battery. Once you've got the tools and are ready to access the key fob and swap the battery. First, locate the button that allows you to release the key. It's located underneath the metal component and is easy to find. The cover that covers the back should come off when you press the button. Then, you can insert the screwdriver's head into the notch or spacing at the top of the metal piece and pry it off.
Once the auxiliary key is removed, insert the new or spare key into the slot. Turn the ignition on and then wait for around five seconds, then set it to off. This will allow the system to recognize the new key and start your vehicle in the future.
You can only program three keys in your Mazda 3. The final thing you want is to have more than two functioning key fobs but not be in a position to get your car started. This is a security measure designed to prevent unauthorized users, like valet drivers who are not authorized to use your key and thereby starting your car.
How to reprogram a spare key?
It's a smart idea to know how you can reprogram a spare key in the event that your original key gets lost or stolen. This will stop unauthorized persons from getting into your car and causing damage to it. This method should work on any Mazda however, you'll require two working keys to start the reprogramming. If you don't own two working keys, you'll need to bring your car to the dealership to get it done.
Begin by stepping into the driver's seat, shutting all doors, with the exception of the one that is open. Turn the ignition on and insert the initial working key. Take five seconds before removing the key. Repeat with the second key.
After you finish programming your new key, you'll have 3 keys that work to start your car in the near future. Before placing each key in storage, make sure that it's working correctly.
It's a good idea buy a spare Mazda 3 key fob, especially if you're someone who frequently loses their key or has other issues with it. You can buy one online or at your local auto store, but make sure to read the reviews before buying so you can avoid getting the wrong key fob compatible with your car.
How do I change the battery with a spare key?
There's mazda key programming than discovering that the battery in your key fob has gone out and you're not able to unlock your vehicle. It's a good thing that it's simple to replace the battery and save yourself some cash at the dealership.
The first step is to press the auxiliary key button located on the back of the key fob. This will remove the key made of metal and reveal two slots on the opposite side of the case. Put the flathead screwdriver in one of these slots. Then, gently break the two sides of the case. When the battery is completely exposed, take it out and put it away somewhere that you won't forget about it.
Before you begin, be sure you have a new replacement battery. You can purchase them at any store that stocks batteries or at an Mazda dealer close to Winter Garden. The correct battery is vital to ensure that your keyfob works correctly.
Then, place the new battery in place and replace the battery cap. Be careful not to scratch the rubber ring on which the battery rests. Finally press the two halves of the key fob together until you hear the sound of a click.
How do I reset the system's Keyless Entry System
The key fob in your Mazda 3 is not only an extra convenience, but also an important security feature. The car won't start if your key is stolen or lost even if you have a spare key fob. This is because the fob that you have to be reprogrammed by the dealership in order to work again. It can be a stressful and costly ordeal. Therefore, it's advisable to learn how to reset the system.
To reset the system, disconnect the battery for approximately 15 minutes. This will clear any residual electric current from the onboard computer. Then, disconnect the LF ECU and demand switch connectors. Check for continuity between the terminals.
To program an entirely new key or spare, insert it into the slot and turn the ignition to ON. The key should remain in the ignition for around five seconds, and then turn it off. The key's details will be saved to your car's computer and the new fob will be able start your car in the future. You can program any number of fobs you would like but only one can be used at a particular time. This stops unauthorized individuals from copying the key and getting ahold of your vehicle. You can purchase a new keyfob online, but it will still need to be cut and programmed by an authorized dealer.