Key Fob Replacement and Reprogramming - Why Your Car Won't Start
Most cars are equipped with an immobilizer system that stops car theft. If your vehicle doesn't start after inserting the key fob, there could be a problem with the transponder chip not sending a security code to the immobiliser system.
This is a quick 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 discover what you can do.
Battery
It is important that you concentrate on the revenue and cost-savings opportunities of your auto repair shop. You can accomplish this by offering key fob replacements and reprogramming for your customers. This will not only help your customers, but it will also boost the profits of your shop without subletting to the dealership.
Typically the battery for the key fob powers the remote opening and locking systems. The immobiliser is not powered by the key fob battery. The immobiliser is powered by the transponder located in the key, fob or instrument cluster. The chip transmits a passcode to the car's immobilizer device, which may be built into the PCM, BCM, the instrument cluster smart junction box, or standalone module. The system then validates the code to make sure it is correct. If the code is incorrect, the system disables components that are crucial to start the car, such as the ignition motor or starter motor. The car will be nearly impossible to start if you don't have the correct key.
The immobiliser system has proven extremely effective at reducing car theft since its introduction. However the fact that thieves are always looking for new ways to get around these security measures. One of these methods is the Kia Challenge trend on TikTok that shows how simple it can be to hot-wire an 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 vehicles equipped with an immobiliser may have issues. These issues are usually simple and cheap to fix. A dying or dead keyfob battery is typically the reason for a malfunctioning ignition immobiliser. A quick diagnostic test will uncover the problem. If key fob repair persists, it could be due to electrical problems or wiring issues. If this is the case, it's recommended to seek out a professional to diagnose and fix the problem.
Transponder Chip
In cars made after 1995, a small electronic chip, referred to as transponder is integrated into the head of your car key. It is also known as a "chip key" or a "transmitter-responder" key. Its function is to prevent your engine from starting if someone else has the same key. It works by transmitting radio signals from the key to your immobiliser system. If the code stored in the car's computer matches the signal sent by the key the immobiliser will then be removed and the engine will be able to start.
The key that is equipped with a transponder chip is often referred to as"fob" or a "smart" key due to the fact that it is more difficult to clone than a conventional mechanical key. It is possible to duplicate a standard key but not a transponder one. Unlike the remote central locking element of a standard key that relies on battery power, a transponder chip is powered by the infrared (IR) signal that is transmitted through the antenna ring on the ignition cylinder.
To activate the transponder chip the ignition cylinder needs to be turned on. The ring emits a blast of IR energy, which is detected by the microchip within the key. The chip then responds with an unique code to the immobiliser in your car. The computer in the car analyzes the code stored in its memory with the one on the transponder and if the two codes match it will start the engine.
If the immobiliser is able to detect an unauthorised transponder, key or other device is being used, it will disable the engine and prevent the essential components from functioning. The car won't move if the engine is not functioning. It is easy for criminals to wire it and then drive off. This is a great deterrent to criminals, which is why you should have your car key-immobiliser repaired promptly if it develops a fault. If you don't fix it, the security light on your vehicle will continue to flash and it will be impossible 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 is an anti-theft device that stops anyone from driving your car without the proper key. If the system is not able to recognize a digital serial number from the chip on your key, it will shut off the engine immobiliser to stop the car from starting.
The car immobiliser system is an an effective way to stop thieves but sometimes it can be out of connection with the key or transponder chip. This could be due to interference or the system becoming too sensitive. If this is the case, it could be necessary to reset. To do this, simply disconnect the battery. Then leave it off for around 15 minutes before reinstalling it and begin 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 vehicle immobiliser's method of letting you know that there is a problem with the system. If you try to start the car and the light stays on, it indicates that the chip inside your key doesn't match the code stored in the ECU. This could happen if you have recently replaced your car's key with a different one that isn't programmed to the vehicle or if you've had a bad swapped ECU.
If this is the case, it's best to bring your transponder key or chip to a professional to have them correctly programmed for the vehicle you are driving. It is possible that the system isn't able to accept the key due to a software update or glitch. To test, put your key in the ignition and then turn it to the ON position. Do not try to start the vehicle. Let the key remain in this position for 10 minutes. This should cause the security light to come on and then to go off. If it does not you'll need to repeat the procedure and wait another 10 minutes. Repeat this three times and the issue should be solved.
Programming
The car immobiliser stops the engine from running when the fob or key is not programmed correctly. It makes use of a unique RFID microchip that cannot be copied and has its own serial number. The immobiliser will stop working if it does not recognise the code. It's hard to beat.
Modern cars are fitted with this security system in the standard configuration. 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 key, and transmitting a passcode to the ECU (electronic control unit). The ECU is aware that it's the right key and hasn't be compromised code. The system won't allow the car to begin if it does not receive the correct code. Some models even inform the owner if they attempt to use an unapproved fob or key.
However the system isn't foolproof. Some thieves have been able to bypass the immobiliser by using methods such as 'hot-wiring'. This involves crossing the wrong wiring in a vehicle to fool the ECU. This method is risky and requires a lot of expertise to avoid electrocuting yourself. Plus, a lot of modern car thieves have switched over to more advanced methods, such as using specialized apps or Bluetooth to steal a car's data and remotely control it using their phone.
Car owners often be greeted by warning lights that indicate an immobiliser gone haywire. This could be due to many reasons however the most common reason is a defective battery in the keyfob. A simple repair should resolve this problem.
If this does not work it could be because the transponder chip is defective or the ECU is not compatible. This is more difficult to determine and fix, as it can involve an expert locksmith for cars or a dealership. However, a car immobiliser may be damaged by water intrusion or even being removed from the fob or key. If any of these problems occur it's a good idea visit a local garage or car dealer for assistance.