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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 stop car theft. If your vehicle won't start after inserting the key fob there may be a problem with a transponder chip that is not sending an encryption code to the immobilizer system.

This is a simple fix that any auto locksmith on the Gold Coast can do. Let's look at the various parts of your mobile car key repair's immobiliser and what you can do to get it fixed.

Battery

It is important that you concentrate on the revenue and cost-savings opportunities that your auto repair shop. You can achieve this by offering key fob replacements and reprogramming for your customers. This will not only benefit your customers, but it will also add to the profits of your shop without subletting to the dealership.

Typically, the key fob battery powers the remote opening and locking systems. The immobiliser is not powered by the key fob battery. Instead, the immobiliser depends on the transponder chip that is located on the fob or key. This chip sends a passcode to the car's immobilizer device which can be integrated into the PCM, BCM, instrument cluster, smart junction box or standalone module. The system then checks the code to ensure that it is correct. If it's not it is, the system will shut down parts that are essential to start the vehicle, such as the ignition or starter motor. This will make the mobile car key repair almost impossible to start without the correct key.

Since its inception the immobiliser has proved to be an extremely effective tool for reducing the theft of cars. Even so, thieves are constantly seeking ways to bypass 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.

Many insurance companies are now incorporating in the use of an immobiliser when they calculate premiums, making it even more appealing to buy cars that already have this feature. However, even vehicles that came factory-fitted with an immobiliser may experience issues with it. Fortunately, these problems are usually simple and inexpensive to repair. The majority times the issue is the result of the dying or dead key fob battery. A quick diagnostic test can reveal this issue. If the issue continues to persist, then there might be other reasons for the car's misbehaviour, including electrical issues or a wiring issue. If this is the case, it's recommended to seek out a professional to diagnose and repair the issue.

Transponder Chip

A small electronic chip, referred to as transponder, is incorporated inside the head portion of your car keys. The technology was introduced in vehicles manufactured after 1995. It is also known as a "chip key" or a "transmitter-responder" key. Its goal is to stop your engine from starting when another person has a duplicate of your key. It works by transmitting an audio signal from the key to your immobiliser system. If the code stored in the computer of the car matches the signal sent by the key, the immobiliser will be deactivated and the engine will begin to run.

The key that has a transponder is also referred to as a "fob" or a "smart" key, as it is more difficult to copy than mechanical keys. Using specific methods, it is possible to duplicate a standard car key but not a transponder key. Transponder chips are powered by an infrared signal, not battery power.

To activate the transponder, the ignition cylinder needs to be in the ON position. The ring emits IR energy which is received by a microchip in the key. The chip responds by sending a unique code to the immobiliser in your car. The car's computer compares the code stored in its memory with that from the transponder chip and If they are compatible the engine will begin to rev.

The immobiliser will shut down the engine when it detects an unauthorised transponder or key. It also stops any vital components of the vehicle from functioning. Without a functioning engine, the vehicle will not be able to move, and it could be easy for a criminal to wire the vehicle and then drive off. This is a great security measure against crime, and is why you must have your car's key-immobiliser repaired as soon as you can when it has a problem. If you don't fix it, the security light in your car will keep flashing and it will be difficult to start your engine.

Security Light

The immobiliser is powered by a small battery that sends an electrical signal to the transponder chip in your key. It is an anti-theft device that prevents anyone from opening your vehicle without the proper key. If the system is not able to recognize an electronic serial number from the chip on your key, it will disable the engine immobiliser to prevent the car starting.

The car immobiliser is an excellent method of deterring thieves, but it can sometimes get out of sync. This can be due to interference or an immobiliser that is too sensitive. This may require the system to be reset. To do this, simply disconnect the battery. Leave it disconnected for about 15 minutes then reinsert it and start the vehicle. This will reset the system and allow it to accept your key again.

The security light is the vehicle immobiliser's way of telling you that there is an issue with the system. If you attempt to start the car but the light stays on it means that the chip inside your key isn't compatible with the code stored in the ECU. This can occur when your car's key has been replaced with a new key that's not compatible with the vehicle, or when an ECU was not swapped correctly.

If this is the situation you should bring your transponder key or chip to a professional to get them properly programmed for your car. There is also the possibility that the system isn't accepting the key due to an issue with the software or an update. To test this, put your key in the ignition and turn it to ON but don't attempt to start the engine. The key should remain in this position for ten minutes. This should cause the security lights to come on and then to turn off. If it doesn't then you'll need to repeat the process and wait another 10 minutes. This should resolve the issue If you repeat the procedure three times.

Programming

The car immobiliser blocks the engine from running if a key or fob is not properly programmed. It utilizes a specific RFID chip that cannot be duplicated and has a unique digital serial number. The immobiliser will stop working in the event that it is unable to recognize the code. That's why it's so difficult to beat.

Modern cars come with this security system in the standard configuration. This makes it very difficult to hot-wire a car or use a different key for starter. The system works by checking the chip inside a key fob or 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 passcode hasn't been compromised. The system will not allow the car key repair to start when it doesn't receive the correct code. Some models even notify the owner if they try to use an unapproved fob or key.

However, the system is not completely secure. Some thieves have managed to bypass the immobiliser using methods such as 'hot-wiring.' This involves crossing the wrong wiring in a vehicle in order to trick the ECU. However, this is extremely dangerous and requires a lot of experience to do it without damaging yourself. Modern car thieves are employing more sophisticated methods for instance, Bluetooth or other specialized apps to steal a car's information and remotely control it.

Owners of cars will often be greeted by warning lights that indicate an immobiliser that has gone out of control. This can happen for various reasons, but the most common is due to a damaged or dead battery on the key fob. A simple replacement should fix this problem.

If this isn't working the transponder chip could be faulty or mismatched with the ECU. This is more difficult to fix and diagnose and may require an expert locksmith for cars or a dealership. However, a car's immobiliser can be damaged by water ingress or even physically being pulled away from the fob or key. If any of these problems occur it's recommended to visit the nearest garage or dealer for assistance.