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Key Fob Replacement and Reprogramming – Why Your Car Won't Start Currently, most vehicles come equipped with an engine immobilizer to prevent car theft. If your vehicle won't start after inserting the key fob, it could be a problem with a transponder which isn't sending a security signal 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 parts of your vehicle immobiliser to see what you can do. Battery It is essential to focus on the cost-savings and revenue opportunities that your auto repair shop. One way to do this is to provide key fob replacement and reprogramming services to your customers. This will not only benefit your customers but also increase your shop's profits, without having to sublet to the dealership. Typically the key fob battery powers the remote locking and opening systems. However, it does not provide power to the immobiliser. The immobiliser is powered through the transponder in the fob, key or instrument cluster. The chip transmits a passcode from the key or fob to the immobilizer unit of the car. It can be integrated into the PCM (power control module) BCM (brake control module) instrument clusters, smart junction boxes, or standalone modules. The system then checks the code to ensure that it is correct. If it is not then the system will disable elements that are crucial to the start of the vehicle, like the starter motor or ignition. The car will be impossible to start if you do not have the correct key. Since its introduction the immobiliser has proven to be an extremely effective tool in decreasing car theft. However thieves are always seeking ways to bypass these security measures. One of these techniques is a recent trend called the Kia Challenge on TikTok that showed how easy it was to connect a vehicle with hot wires. Insurance companies are now factoring in the use an immobiliser when calculating premiums. This makes it more attractive to purchase a car that has this feature. However, even vehicles equipped by the manufacturer with an immobiliser may experience problems with it. Fortunately, these issues are usually simple and inexpensive to solve. The majority times, a faulty immobiliser is the result of an inactive or dead key fob battery. A quick diagnostic test can identify the issue. If the issue persists, it could be due to electrical problems or wiring issues. It is best to let a professional identify the issue and then solve it. Transponder Chip In cars manufactured after 1995, a small electronic chip referred to transponder is embedded in the head of your car key. Also known as a chip key or a 'transmitter and responder key, it's designed to stop the engine from starting if another person has the same key. It functions by sending a radio frequency signal from the key to the immobiliser system of your car. If the code stored in the computer of the car matches the signal transmitted by the key, the immobiliser will be deactivated and the engine will start. The key with the transponder chip is sometimes called a 'fob' or a smart key due to the fact that it is more difficult to duplicate than a conventional mechanical key. It is possible to duplicate a standard key but not a transponder key. Contrary to the central locking element remote of a standard key that relies on battery power, a transponder chip powered by an infrared (IR) signal that is transmitted by the antenna ring on the ignition cylinder. To activate the transponder chip, the ignition cylinder must be turned to the ON position. The ring emits IR energy which is received by a microchip inside the key. The chip responds by sending a unique code to the immobiliser of your car. The car's computer checks the code in its memory with that from the transponder chip, and if they match, the engine will start. If the immobiliser detects an unauthorised transponder, key or other device is being used, it will disable the engine and prevent the essential components from working. The car won't move if the engine is not functioning. It's easy for criminals to wire it and then drive off. This is a powerful security measure against crime, and is why you must have your car's key-immobiliser fixed promptly if it develops a fault. If you don't, the security light on your car will keep flashing and it will be inaccessible for you to start your engine. Security Light The immobiliser utilizes a small battery to transmit an electrical signal to the chip that is in your key. This anti-theft device stops anyone from starting the car without the correct keys. If the system cannot detect an electronic serial number from the chip in your key, it will shut off the engine immobiliser, which will stop the car starting. The car immobiliser is a great way to deter thieves, but it could sometimes get out of in sync. This can be due to interference or the system becoming too sensitive. This could require an adjustment. To do this, disconnect the battery. After 15 minutes, reconnect the battery and restart the vehicle. This will reset the system and make it ready to accept your key once more. The security light is a way of warning you of the presence of a problem. If you try to start the car but the light stays on, it means that the chip in your key isn't compatible with the code that is stored in the ECU. This could happen if you have recently replaced your car's key with another that was not programmed to your vehicle or in the event that you've had a defective swapped ECU. If this is the case then it's time to go to a professional for assistance and get the the transponder chip properly programmed to your vehicle. There is also the possibility that the system is not accepting the key because of an issue with the software or an update. To test this put your key in the ignition and switch it to the ON position but don't try to start the engine. The key should remain in this position for ten minutes. The security light should turn on, then go off. If it doesn't, you'll have to repeat the procedure and wait another 10 minutes. car key repairs near me should solve the problem when you repeat the process three times. Programming The car immobiliser prevents the engine from running if a key or fob is not programmed correctly. It makes use of a unique RFID microchip that isn't able to be copied and has its own serial number. The immobiliser will be disengaged when it is unable to recognize the code. It's hard to beat. Modern cars have this system as standard. This makes it difficult to hot-wire a car or use a different key as a starter. The system works by checking the chip inside a key fob or a key and sending a passcode to the ECU (electronic control unit). The ECU is then able to determine that it's the right key and that the code hasn't been compromised. The system won't allow the car to start if the does not receive the correct code. Some models will even report back to the owner in the event that someone attempts to use a wrong key or fob. However it isn't foolproof. Some thieves have been able to get around the immobiliser using methods such as 'hot-wiring'. This involves crossing the wrong wires through a vehicle's wiring to fool the ECU into thinking that the proper key or fob is being used. But, this technique is extremely risky and requires a great deal of experience in order to do it without cutting yourself. Plus, a lot of modern car thieves have shifted to more sophisticated methods, such as using specialized apps or Bluetooth to hijack the car's data and then remotely control it via their phone. Car owners often see warning lights that indicate an immobiliser that has gone out of control. This can occur for many reasons but the most frequent reason is a defective battery in the keyfob. This issue can be resolved by replacing the battery. If this isn't working the transponder chip could be defective or not compatible with the ECU. This is more difficult to diagnose and fix as it may require a professional locksmith or dealership. The car immobiliser could also be damaged if water manages to get into the system or if it is physically removed from its fob or key. If you encounter any of these problems, it is a good idea to consult the local car dealer or garage to seek help.