Lexus Key Replacement - Replacing a Remote Or Fob
If you have a traditional Lexus key that turns on the ignition or a smart key for your car that activates with the push of a button, eventually the battery inside your fob will run out. Replacing it is easy with a paperclip: Pop the battery that is in use and replace it with the new one (refer to your owner's manual to determine which kind of battery you require), and clip it back into place.
Keys
Lexus keys aren't easy to replace. A professional locksmith is required to design an appropriate replacement that functions. Each Lexus key has an embedded microchip, which needs to be programmed to sync with the immobiliser system of your vehicle.
It requires a lot time and specialized equipment for this procedure to be executed correctly. Each model comes with its own set of programming procedures. Replacing a lost or damaged key or fob is a cost-effective service and should be left to professionals unless you possess the right tools and know-how.
No matter if you're using a conventional key that turns in the ignition barrel or a smart key that starts the car at the touch of an arrow they will both eventually need their batteries replaced. You can save money by doing it yourself but it will require a small Phillips screwdriver as well as an old coin (a 20p piece works well) and a paperclip. You will find one or two screws on the back of the fob of the key. Remove them and store them safely (they are small and easy to lose). Remove the fob, revealing a circular indentation where the key's metal surface will be. Pop the battery out by using a paperclip. Then, insert the new battery, ensuring that it is inserted correctly. Then, you can clip the inside of the key back together.
Remotes
Replacing a Lexus remote or fob can be complicated and requires skilled locksmiths with the right tools as well as knowledge. Certain models require that the transponder chip contained in the key be programmed to function with the immobiliser of the car. The Lexus models use different methods to program these chips. This is done by using a specific device that sends a signal to the chip which matches the code used to unlock the doors and start the engine.
Certain Lexus cars are constructed with a single piece of hardware which includes the key head as well as the remote. These are simpler to replace as no separate chip is required. This kind of key is also a bit less expensive.
Regardless of the key type no matter what type of key it is, all fobs eventually run out of battery power. It can be frustrating however with a little bit of knowledge you can get your Lexus back in operation. Refer to the owner's manual to determine what type of battery you need. Then, search for a replacement. Find a small hole on the inside of your fob. Insert the coin (20p works well) into the hole and twist. This should reveal an unflattened area that you can employ a paperclip to take away.
Then, take out the old battery and replace it with the new one. Be sure the replacement battery is in the proper direction of operation. Finally, clip the inside of the fob back together and reconnect the key to the metal.
Transponder Chips
More or less all new cars since 1995 have transponder chips embedded in the key head to disarm the immobiliser system. If you've got a key with a chip inside, the head is covered with a plastic cover that is able to be pulled off to reveal an L-shaped metal key. A transponder-chip replacement key, also known as a fob is a multistage process. It involves cutting the keys accurately and programming the chip to sync up with the vehicle's immobiliser.
A transponder is an electronic chip that has Non-Volatile Memory (NVM) that houses a set of windings (very fine wire coiled around the tube) which look similar to ones found in an electric motor. The windings generate a coded message that the car read. If the code is correct, then the car will allow you to start it up.
There are two types of transponder chips. One called the 80 bit and the other is known as a circle + (General Motors). The first is reusable but must be delocked with a special device to function in a different compatible vehicle. The latter one is more difficult because the previous keys are usually damaged and then drilled through or thrown away when key cases are replaced. However, they can be used with a key-service that doesn't require a battery.
Immobiliser Systems
Immobiliser systems are electronic security devices that stop thieves from starting up your car. It operates by sending a signal from the vehicle to the key when you attempt to start it. The electronic chip inside your key responds with a unique code which must match the one in the vehicle to start. If the codes do not coincide, your engine will shut down immediately to prevent theft.
Modern smart keys and fobs come with an embedded transponder which stores electronic security information in a format that is not easily copied. When your key or fob is placed in the ignition, it transmits this code to a receiver inside the ECU. The ECU is able to compare this code with the one in its memory, and activates both the fuel system as well as the ignition circuit if they are compatible. If the codes do not match then the engine will not start even if the ignition circuit is cut off by a criminal.
The replacement of a key or fob involves multiple steps that include cutting the new key blade accurately and programming it to ensure that it is compatible with the car's system. Each immobiliser is unique and has its own programming procedure. The Key Lab use Ross-Tech to ensure that the replacement key is programmed correctly. This will ensure maximum performance and security.