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Key Fob Replacement and Reprogramming - Why Your Car Won't Start

Currently, most vehicles come equipped with an engine immobilizer in order to prevent car theft. If your vehicle won't start after inserting the key fob there may be a problem with the transponder chip not sending an authorization code to the immobiliser system.

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 car's immobiliser and what you can do to fix it.

Battery

It is important that you focus on the revenue and cost-savings potentials of your auto keys repair shop. One method to achieve this is to offer key fob replacement and reprogramming services to your customers. This will not only benefit your customers, but it will also increase the profits of your business without having to sublet to the dealership.

Typically, the key fob battery powers the remote key fob repair opening and locking systems. The immobiliser is not powered by the key fob battery. Instead, the immobiliser depends on the transponder chip in the key or fob. The chip transmits a passcode from the key or fob to the immobilizer unit in the car. It can be integrated into the PCM (power control module) BCM (brake control module for brake control), instrument clusters smart junction boxes or standalone modules. The system then validates the code to ensure that it is correct. If it's not then the system will disable elements that are crucial to the start of the vehicle, like the starter motor or ignition. This will make the vehicle almost impossible to start without the correct key.

Since its introduction the immobiliser has proven to be an extremely effective tool for decreasing car theft. However it is not uncommon for thieves to look for new ways to circumvent these security measures. One of these strategies is an upcoming trend called the Kia Challenge on TikTok that showed how easy it was to hot-wire a vehicle.

Insurance companies are now factoring the use of an immobiliser when calculating premiums. This makes it more appealing to buy a car with this feature. Even vehicles equipped with an immobiliser might be prone to problems. Fortunately, these problems are usually simple and inexpensive to fix. The majority of the time, a faulty immobiliser is caused by the dying or dead key fob battery. A quick diagnostic test will identify the issue. If the issue persists, then there might be other reasons for the car's misbehaviour, including electrical issues or a wiring problem. It is best to let a professional identify the issue and then solve it.

Transponder Chip

In cars made after 1995, a small electronic chip, referred to as a transponder is built into the head of your car key. Also known as a 'chip key or a 'transmitter & responder' key, it is designed to stop the engine from starting if a third party has the same key. It functions by sending an audio frequency signal from the key to the immobiliser system inside your car. If the code on the car's computer matches that signal transmitted by the key, it will deactivate the immobiliser and allow the engine to begin.

The key with the transponder chip can be referred to as a 'fob' or a 'smart' key due to the fact that it is more difficult to copy than a traditional mechanical key. Using specific techniques, it is possible to duplicate a standard car key but not a transponder key. Unlike the remote central locking element of a conventional key, that relies on battery power, a 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 the ignition cylinder must be in the ON position. The ring emits a burst of IR energy which is detected by the microchip inside the key. The chip then responds with an individual code to the immobiliser of your car. The car's computer checks the code in its memory to the one from the transponder chip and if they match the engine will be able to start.

If the immobiliser detects an unauthorized transponder or key is being used, it will disable the engine and stop any of its essential components from functioning. The car will not move in the event that the engine is not working. It's easy for a criminal to hot-wire it and drive off. This is a powerful deterrent to crime, and is one of the reasons why it is essential to get your car key immobiliser repaired when you spot a fault with it. If you don't, the security light on your car will keep flashing and it will be difficult to start your engine.

Security Light

The immobiliser is powered by a tiny battery that transmits an electrical signal to the transponder chip in your key. It is an anti-theft device that stops anyone from driving your car without the proper key. If the system is unable to detect a digital serial number from the chip in your key, it will deactivate the engine immobiliser, preventing the car from beginning.

The car immobiliser system is an effective in stopping thieves but sometimes it can be out of connection with the key or the transponder chip. This can be due to interference or the system is too sensitive. This could require the system to be reset. To do this, just disconnect the battery. It should be left disconnected for around 15 minutes then reinsert it and begin the car. This will reset the system and make it ready to accept your key again.

The security light is an immobiliser's method of warning you of an issue. If you attempt to start the car keys repair near me and the light stays on it indicates that the chip in your key isn't in sync with the code that is stored in the ECU. This could happen if you have recently replaced your car's key with a different one that has not been programmed to your vehicle or in the event that you've had a defective swapped ECU.

If this is the case then you need to go to a professional and have the key or the transponder chip properly programmed to your vehicle. There is also the possibility that the system is not accepting the key due to an update or software issue. To test this put your key in the ignition and turn it to ON but don't attempt to start the engine. Let the key stay in this position for ten minutes. The security light should turn on, and then go off. If it does not then you must repeat this procedure and wait for another 10 minutes. Do this three times, and the issue will be resolved.

Programming

A car immobiliser prevents the engine of a car from running without a correctly programmed key or fob. It is a unique RFID chip that cannot be copied and has a digital serial number. The immobiliser will stop working in the event that it is unable to recognize the code. This is why it's so hard to beat.

Modern cars have this system as standard. This makes it really hard to wire the car hot or use another key for starter. The system works by analyzing the chip inside the key fob or key and sending a passcode to the ECU (electronic control unit). The ECU will then verify that it's the correct key and that the passcode hasn't been compromised. The system won't permit the car to start if it doesn't have the correct code. Some models will even report back to the owner if someone tries to use an incorrect key or fob.

However, the system is not impervious to theft. Some thieves have gotten around the immobiliser by using techniques such as 'hot-wiring.' This involves crossing the wrong wires within a vehicle's wiring to fool the ECU into thinking the correct key or fob is being used. However, this is quite risky and requires a lot of knowledge of how to accomplish it without damaging yourself. Modern car thieves are also employing more sophisticated methods like Bluetooth or other apps that steal a car's information and remotely manage it.

Car owners will frequently notice warning lights that signal an immobiliser that has gone out of control. This can happen for various reasons, but the most frequent is due to a damaged or dead battery in the key fob. A simple repair should resolve the issue.

If this isn't working the transponder chip could be faulty or mismatched with the ECU. This is more difficult to fix and diagnose as it could require a professional locksmith or dealership. However, a car immobiliser may also be damaged due to water intrusion, or even being removed from the fob or key repairs. If you encounter any of these problems, it is a good idea to consult the local emergency car key repair dealer or garage to seek help.