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Key Fob Replacement and Reprogramming – Why Your Car Won't Start Nowadays, all vehicles are equipped with an engine immobilizer to prevent car theft. If your vehicle will not start after inserting the key fob, it could be an issue with a transponder that isn't sending a security message to the immobilizer. This is a simple fix that any auto locksmith on the Gold Coast can do. Let's take a look at the different elements of your car's immobiliser and what you can do to fix it. Battery If you are in the auto repair business, it is important to be aware of your shop's revenue and cost-saving opportunities. One method to achieve this is to offer key fob replacement and reprogramming to your customers. This will not only assist your customers, but it will also boost your shop's profits without subletting to the dealership. The key fob battery is used to power the remote locking and opening systems. However, repair car key fob does not supply power to the immobiliser. Instead, the immobiliser depends on the transponder chip that is located in the key or fob. The chip transmits a passcode to the immobilizer unit of the car that can be integrated into the PCM, BCM, instrument cluster, smart junction box or standalone module. The system examines the code to ensure it's correct. If the code is incorrect, the system disables components that are crucial to start the car, like the ignition or starter motor. The car will be impossible to start if the driver doesn't have the correct key. Since its inception the immobiliser has proven to be a very effective tool in decreasing car theft. Despite this the fact that thieves are always looking for new ways to get around these security measures. One of these techniques is a recent trend called the Kia Challenge on TikTok that showcased how easy it is to wire a vehicle. Many insurance companies are now incorporating in the use of an immobiliser when calculating premiums, which makes it more attractive to shop for cars that already have this feature. Even cars that are factory-fitted with an immobiliser might have problems. Fortunately, these issues are usually simple and inexpensive to repair. Most of the time the issue is caused by a dead or dying key fob battery. This can be determined by a quick diagnostic test. If the problem persists and continues to recur, there could be other causes of the car's irregular behavior, such as electrical issues or a wiring problem. It is recommended to have a professional identify the issue and then solve it. Transponder Chip In vehicles manufactured after 1995, a tiny electronic chip referred to a transponder is built into the head of your car key. It is also referred to as a “chip key” or a “transmitter-responder” key. Its purpose is to stop your engine from starting if someone else has the same key. It works by sending a radio frequency signal from the key to the immobiliser system in your car. If the code in the car's computer matches the signal sent from the key, it will disable the immobiliser and allow the engine to start. The key with a transponder is also referred to as a “fob” or a “smart” key, as it is more difficult to duplicate than a mechanical key. It is possible to duplicate a conventional key but not a transponder key. Contrary to the remote central locking element of a standard key which is powered by batteries the transponder chip is powered by the infrared (IR) signal that is transmitted by the antenna ring that is located on the ignition cylinder. To activate the transponder chip the ignition cylinder needs to be turned on. The ring emits a burst of IR energy which is absorbed by the microchip in the key. The chip responds with a unique code to the immobiliser of your car. The car's computer compared the code stored in its memory with that from the transponder chip and if they match the engine will begin to rev. The immobiliser will shut down the engine if it detects an unauthorized key or transponder. It will also prevent any vital components of the car from functioning. Without a functioning engine, the vehicle won't be able to move and it could be easy for criminals to connect the vehicle to a hot wire and then drive off. This is a great deterrent to crime, and is the reason why you should get your car key-immobiliser repaired as quickly as possible if it develops a fault. If you do not take action then the security light on your car will keep flashing and you will not be able to start it. Security Light The immobiliser is powered by a tiny battery that sends an electric signal to the transponder chip inside your key. It is an anti-theft device that stops anyone from starting your car without the right key. If the system is not able to recognize a digital serial from the chip on your key, it will disable the engine immobiliser to stop the car starting. The car immobiliser is a fantastic way to deter thieves, but it could occasionally be out of in sync. This can be due to interference or a system that is too sensitive. If this is the case, it might need to be reset. To do this, disconnect the battery. After 15 minutes, reinstall the battery and restart the vehicle. This will reset the key system so that it is ready to accept your keys once again. The security light is the car immobiliser's method of letting you know that there's a problem with the system. If the light is illuminated and you try to start your vehicle, it indicates that the code that is stored in the ECU does not match the chip on the key. This can happen in the event that your car's key was replaced with a new one that is not programmed for the vehicle, or if the ECU was swapped in a wrong manner. If this is the case, then it's time to go to a professional to have the key or the transponder chip properly programmed to your vehicle. It is possible that the system won't accept the key due to a software upgrade or glitch. To test this, place your key in the ignition and turn it to ON but don't try to start the engine. Let the key remain in this position for 10 minutes. This should cause the security lights to light up and then to go off. If it does not then you must repeat this procedure and wait another 10 minutes. Repeat this three times, and the issue should be solved. Programming The car immobiliser prevents the engine from running if a key or fob is not programmed correctly. It is a unique RFID chip that can't be duplicated and has a unique digital serial number. The immobiliser will disengage if it doesn't recognise the code. That's why it's so difficult to defeat. Modern cars are fitted with this security system as standard. This makes it very difficult to hot-wire the car or use a different key for starter. The system operates by sending a passcode from the key fob to the ECU. The ECU will then verify that it's the right key and that the code hasn't been compromised. The system won't permit the car to start if it doesn't have the correct code, and some models will even notify the owner if a person tries to use a wrong key or fob. The system isn't impervious to attack, but it is. Some thieves have managed to get around the immobiliser using techniques like 'hot-wiring'. This involves crossing the wrong wiring in an automobile to cause a malfunction in the ECU. This is a risky method and requires extensive experience to avoid electrocuting oneself. Modern car thieves are using more advanced methods, such as Bluetooth or specialised apps to steal a car's information and remotely control it remotely. Car owners often see warning lights that indicate that the immobiliser has gone off the rails. This could be due to many reasons, but the most common one is a malfunctioning battery in the keyfob. A simple replacement should fix this issue. If this isn't working the transponder chip could be faulty or mismatched with the ECU. It is more difficult to fix and diagnose, as it can involve an expert locksmith for cars or a dealership. A car's immobiliser can be damaged if water is able to get into the system or if it is physically removed from its fob or key. If any of these issues occur, it's a good idea visit a local garage or car dealer to seek assistance.