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

The majority of vehicles have an immobilizer system that stops car theft. If your vehicle isn't starting after inserting the key fob there could be a problem with the transponder chip not transmitting a security code to the immobiliser system.

This is a straightforward fix that any auto locksmith on the Gold Coast can do. Let's examine the different components of your car immobiliser and what you can do to get it fixed.

Battery

If you're in the auto repair business it is crucial to be aware of your shop's earnings and cost-saving opportunities. You can do this by offering key fob replacements and reprogramming to your customers. This will not only benefit your customers, but will also boost your shop's profit, without having to sublet to the dealership.

Typically the battery for the key fob powers the remote locking and opening systems. However, it doesn't provide power to the immobiliser. The immobiliser is powered by the transponder in the key, fob or instrument cluster. This chip sends a passcode to the immobilizer unit of the car which can be integrated into the PCM, BCM, instrument cluster smart junction box or standalone module. The system will check the code to make sure it's correct. If the code is not correct it will disable the components that are essential to the start of the Emergency Car Key Repair, such as the ignition motor or starter motor. This will make the vehicle difficult to start without the right key.

Since its inception the immobiliser has proved to be an extremely effective tool for decreasing car theft. However the thieves are always trying to get around these security measures. One of these techniques is an upcoming trend called the Kia Challenge on TikTok that showcased how easy it is to wire a vehicle.

The majority of insurance companies now factor in the use of an immobiliser in calculating premiums, which makes it more attractive to buy a car that already has this feature. Even cars equipped with an immobiliser could have issues. Fortunately, these problems are usually straightforward and affordable to repair. A dying or dead keyfob battery can be the cause of a faulty ignition immobiliser. This can be determined by a quick diagnostic test. If the problem persists then it could be due to electrical problems or wiring issues. If this is the case, it's best to have a professional diagnose and repair the problem.

Transponder Chip

In cars manufactured after 1995, a tiny electronic chip called transponder is integrated 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 another person has a copy of your car key. It works by sending the radio frequency signal from the key to the immobiliser system in your car. If the code on the car's computer matches that signal from the key, it will deactivate the immobiliser and allow the engine to begin.

The key that has a transponder is also called a "fob" or a "smart" key, as it is more difficult to duplicate than a mechanical key. With the help of specific methods, it is possible to duplicate a standard car key however, not the transponder key. Contrary to the remote central locking element 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 that is located on the ignition cylinder.

To activate the transponder the ignition cylinder needs to be in the ON position. The ring emits a blast of IR energy which is detected by the microchip inside the key. The chip responds with an individual code to the immobiliser in your car. The car's computer compares the code in its memory with the one from the transponder chip, and when they match the engine will begin to rev.

If the immobiliser detects an unauthorized transponder or key is in use it will shut down the engine and prevent any of its vital components from functioning. The car won't move if the engine is not functioning. It would be easy for a criminal hot-wire it and drive off. This is an effective deterrent to crime, and is the reason why you should get your car key-immobiliser repaired as quickly as possible in the event of a malfunction. If you don't do this, the security light in your vehicle will continue to flash and it will be impossible to start your engine.

Security Light

The immobiliser is powered by a tiny battery that transmits an electrical signal to the transponder chip within your key. This device is designed to prevent anyone from starting the car if they don't have the correct keys. If the system cannot detect a digital serial number from the chip in your key, it will disable the engine immobiliser and prevent the car from getting started.

The car immobiliser is a great method of deterring thieves, but it could occasionally be out of sync. This can be due to interference or an immobiliser that is too sensitive. This could require the system to be reset. To do this, simply disconnect the battery. Then leave it off for around 15 minutes before reinstalling it and start the car. This will reset the key system to ensure that it is ready to accept your keys once again.

The security light is the car immobiliser's way of telling you that there is a problem with the system. If the light is on when you attempt to start your car, it is a sign that the code that is stored in the ECU is not compatible with the chip in the key. This can occur if your car key has been replaced with a new key that's 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 for assistance and get the mobile key fob repair or the transponder chip properly programmed to your vehicle. It's possible that your system will not accept the key due to a software upgrade or bug. To test this, insert your key into the ignition and then turn it to the ON position. Don't try to start the vehicle. The key should remain in this position for ten minutes. The security light should come on, then turn off. If it doesn't you'll need to repeat this procedure and wait for another 10 minutes. This should solve the issue when you repeat the process three times.

Programming

A car immobiliser stops the engine of a car from running without a properly programmed key or fob. It uses a special RFID microchip that isn't able to be duplicated and has its own serial number. The immobiliser will stop working in the event that it is unable to recognize the code. That's why it's difficult to beat.

Modern cars come with this system as standard. This makes it extremely difficult to wire the car hot or use a different key for starter. The system works by analyzing the chip inside the key fob or key and transmitting a passcode to the ECU (electronic control unit). The ECU then knows that it's the correct key and that the passcode hasn't been compromised. The system will not allow the car to start when it doesn't receive the correct code. Some models even inform the owner when they attempt to use an incorrect fob or key.

However the system isn't impervious to theft. Some thieves have managed to get around the immobiliser using methods such as 'hot-wiring'. This involves crossing the wrong wires within a vehicle's wiring to fool the ECU into thinking that the correct key or fob is being used. This is a risky method and requires extensive experience to avoid electrocuting oneself. Modern car thieves are also using more advanced methods, for instance, Bluetooth or other apps that obtain information about a vehicle and remotely control it.

Car owners will frequently see warning lights that indicate an immobiliser that has gone out of control. It can occur for a variety of reasons, but the most frequent is due to a damaged or dead battery on the key fob. A simple replacement can fix this issue.

If this doesn't work, the transponder chip might be faulty or mismatched with the ECU. This is more complicated to determine and fix, as it can involve a specialist car locksmith or dealership. A car's immobiliser can be damaged if water is able to get into the system, or if it is physically pulled away from its fob or key. If any of these problems occur it's recommended to visit the nearest garage or dealer to seek assistance.