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How to Add, Change, and Reprogram a Mazda 3 Spare Key
It's a good idea always to have a spare key on hand in case you lose your keyfob, or it has stopped working. This article will explain everything you need to know about adding, changing, or reprogramming your Mazda 3 key fobs.
Certain keys require programming from an experienced locksmith, whereas others do not. Make sure you use only official Mazda replacements to replace your key fob.
How to Add a Spare Key
You can add a second key if you don't have a spare key available or if you accidentally break your existing one. To accomplish this, you'll need a small flathead screwdriver and the new CR2025 batteries. Once you have the items and tools, you're ready to open the key fob. Locate the auxiliary key release. It's located underneath the metal portion and is easy to locate. The cover on the back should fall off when you press the button. Then, insert the screwdriver's head into the notch on top or into the space and pry the metal part off.
Insert your spare key or a new one into the slot following the removal of the secondary key. Set the ignition to ON and wait for about five seconds before turning it to off. This will add the new key's information to the system and allow it to start your car in the future.
It's important to note that you can only program up to three keys for 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 security measure to stop unauthorised users from activating your keys and then starting your car.
How do I reprogram a spare key
If you have a spare key, it's important to be aware of how to program it in the event the original key you had is stolen or lost. This will stop unauthorized persons from starting your car or stealing it. This should work with any Mazda. You will need two keys that are working to start the reprogramming process. If you don't have two keys that work it's recommended to take your Mazda to the dealer to have this completed.
Start by getting into the driver's position and close all the doors, except the one that is open. Put the first working key in the slot, then turn the ignition to the ON position. For five seconds, remove the key and repeat the procedure with the second key.
Once you've completed programming your new key you should have 3 keys that will start your vehicle in the future. Before placing each key in storage, make sure that it's functioning properly.
It's a good idea purchase an extra Mazda 3 key fob, especially if you're a driver 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 automobile store, but be sure to read reviews before buying so you aren't buying one that's not compatible with your car.
How to change the battery using a spare key
There's nothing worse than discovering that the battery in your key fob has died and you can't unlock your car. It's a good thing that it's simple to replace the battery and save yourself some money at the dealer.
The first step is to press the auxiliary key button located on the back of the key fob. This will release the key's metal cover and reveal two slots on the opposite side of the case. The flathead should be inserted into one of these slots and then gently pry the two halves of the case apart. Once the battery is fully exposed, remove it and set aside the case somewhere you won't forget it.
Be sure to bring a new battery ready before you start. These batteries can be purchased at any retailer that sells batteries or from a Mazda dealer in Winter Garden. Choosing the right battery will ensure that your key fob functions correctly.
Replace g28carkeys.co.uk on the battery and then insert the new battery. Be careful not to damage the rubber ring on which the battery rests. The two halves should be pressed together until you hear a click.
How to Reset the Keyless Entry System
The key fob on your Mazda 3 is not only an extra convenience, but also an important security feature. The car won't start if your key is lost or stolen even if you have a spare fob. The key fob needs to be reset by the dealer to make it work again. It's a difficult and costly process. Therefore, it's advisable to learn how you can reset the system.
Disconnect the battery from the system for 15 minutes. This will clear any residual electricity from the on-board computer. Next, disconnect both the connectors for the LF-ECU and the demand switch connectors. Check for continuity between the following terminals:
Place the key in the slot, and switch the ignition on. The key should remain in the ignition for about five seconds and then switch it off. The key information is now stored in the car's computer and the new fob can start your vehicle. You can program up to three fobs however, you must only use one at a time. This will stop unauthorised people from copying your key and getting ahold of your car. You can purchase a new key fob online, but you'll still need to go to a dealer or locksmith to get it cut and programmed.