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How to Add, Change, and Reprogram a Mazda 3 Spare Key
If you've dropped your key fob on the floor or it just stopped working, it's an excellent idea to keep an extra key available. This article will tell you how to add, change or reprogramme your Mazda 3 keyfobs.
Note: Some keys require programming from an expert locksmith, while others don't. Use only official Mazda replacements to replace your key fob.
How do I add a spare key?
You can also add an additional key in case you don't have a spare key or if you accidentally damage your existing one. You'll need to use a flathead screwdriver and an CR2025 battery. Once you have these items, it's time to open up the key fob and swap the battery. First, locate the auxiliary key release button. The button is beneath the metal part. It's easy to find. Once you press the button, the back cover should fall off right away. Then, you can insert the screwdriver's tip into the notch at the top or the space and pull the metal piece off.
After the auxiliary keys are removed, insert the new or spare key into the slot. Set the ignition to ON and wait for five seconds before setting it to OFF. This will register the new information on the key to the system that will allow it to start your car 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 able to get your car started. This is a safeguard to stop unauthorized users from activating your keys and starting your car.
How to Reprogram a spare key
If you have a spare key it's a good idea to know how to program it if your original key gets lost or stolen. This will stop unauthorised people from getting into your car and causing damage to it. This method should work on any Mazda but you'll need two keys working to begin the reprogramming. If you don't have two keys that work then it's best to bring your Mazda to a dealer to get this completed.
Start by stepping into the driver's seat and close all the doors, except the one that is open. Place the working key in the slot, then set the ignition to ON. Then wait five seconds before taking out the key. Repeat the process with the second key.
Once you've programmed your new key, you should have three working keys that you can use to start your car in the future. Test each key to ensure sure that they're working properly before putting them away.
You should think about buying a spare Mazda 3 remote, especially in cases where your car is prone to problems. You can purchase one online or at your local automotive store, but make sure to read the reviews before buying so that you aren't purchasing a key fob that's not compatible with your car.
How do I 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 vehicle. It's a good thing that it's simple to replace the battery and save some money at the dealer.
Press the auxiliary key button located at the back of the keyfob. This will take out the key's metal cover and reveal two slots on the opposite side of the case. Insert the flathead screwdriver into one of these slots, and gently remove the two halves of the case. Once the battery is fully exposed, take it out and set aside the case somewhere that you won't forget about it.
Before you start, make sure you have a brand new replacement battery. They can be bought at any store that sells batteries or from a Mazda dealer in Winter Garden. Choosing the right battery will ensure that your key fob works perfectly.
Next, put the replacement battery in its place and then replace the battery cap. Be careful not to scratch the small rubber ring that the battery rests on. Press the two halves together until you hear the click.
How to Reset a Keyless Entry System
The key fob that you have in your Mazda 3 is not only an extra convenience, but also an important security feature. If you lose your key or have it stolen the car will not start even if it has the spare fob. The key fob must be reprogrammed by a dealer to enable it to function again. This can be an expensive and time-consuming process, so it's a good idea to learn how to reset the system yourself.
Remove the battery from the system for 15 minutes. mazda car key battery will erase any residual electricity in the on-board computer. Then, disconnect the LF ECU and demand switch connectors. Then, check continuity between the following terminals:
To program a new key or a spare, insert it into the slot and turn the ignition to ON. Put the key in for around five seconds, and then switch it off. The key's information has been added to the computer in your car and the new fob will start your car. You can program as many fobs you want but only one can be used at any given time. This will stop unauthorised people from copying your key and getting ahold of your vehicle. You can purchase a new keyfob online, however it still needs to be programmed and cut by a dealer.
