Lexus Key Replacement - Replacing a Remote Or Fob
If you have a traditional Lexus key that is used to turn on the ignition or a smart key for your car that starts with the push of one button, eventually the battery in your fob will die. It is simple to replace it with the help of a paperclip. Simply remove the old battery, insert the new one (refer to the owner's manual to determine the type of battery that you require), then clip it back in its place.
Keys
Lexus keys aren't always easy to replace. A specialist locksmith is needed to make an alternative that functions. This is because every Lexus key is equipped with an embedded microchip that must be programmed to synchronise with the immobiliser of your vehicle and if it's not, it'll not start.
This process takes time and specialized equipment to complete correctly, and each model has a different programing procedure. Replacing a key or remote fob can be a costly task and one you should leave to experts unless you have the proper tools and knowledge.
You'll need to replace the batteries in your smart key or traditional key. Both keys operate by turning the barrel of the ignition. lexus key can save money by doing this yourself but it will require a small Phillips screwdriver as well as an old coin (a 20p piece works well) and a paperclip. There are one or two screws on the back of the fob for the key. Unscrew them and store them securely (they are small and easy to lose). The fob can be removed to reveal an indentation that is circular for the key made of metal. Take the battery out (using the paperclip) and replace it with the new battery, making sure it's the correct way up. Then, you can clip the inside of the key back to the fob.
Remotes
Replacing the Lexus remote or fob is complicated and requires expert locksmiths with both the right tools and expertise. Certain models require that the transponder chip contained in the key be changed in order to work with the immobiliser of the car. The Lexus models use different methods to program these chips. This is accomplished using a specific device that sends a code to the chip to unlock the doors or to start the engine.
Some Lexus cars are equipped with a single unit that incorporates the key head and the remote, and these are simpler to replace as there is no separate chip. This kind of key could also be a bit cheaper.
All fobs eventually lose battery power, regardless of the type of key. It can be frustrating however with a little know-how you can get your Lexus up and running again. Start by reading the owner's guide to determine the type of battery you need and then locate an alternative. Find a small opening on the inside of the fob. Insert a coin (20p is a good choice) into the hole and then twist. You will see a flat surface that you can remove with an ordinary paperclip.
Next, pop the old battery away and then insert the new one. Make sure that the new battery is installed with the proper polarity. Finally, clip the inside of the fob back and insert the key back into the metal.
Transponder Chips
The majority of new cars built since 1995 have transponder chips in the key head that allow it to deactivate the immobiliser system. If you've got a key that has a chip inside it, the head is covered in a plastic cover that can be pulled off to reveal an L-shaped metal key. A transponder-chip replacement keys or fob is a multi-stage process. It involves cutting the keys with precision and programming the chip to connect with the vehicle immobiliser.
A transponder is a chip with Non-Volatile Memory. It contains a set windings, which are very fine wires that are wrapped around a tube. They look similar to those 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.
There are two kinds of transponder chips. One is known as the 80 bit and the other one is called a circle + (General Motors). The former can be reused however it must be unlocked with a special device to work in another compatible vehicle. The second type is more difficult to use because the older keys could be broken, drilled or taken away when key cases are changed. They can be salvaged however and then used to create a service key that doesn't need a battery to function.
Immobiliser Systems
An immobiliser system is an electronic security measure which prevents thieves from opening your vehicle. It operates by sending a signal from the vehicle to the key whenever you attempt to start it. The electronic chip in your key then responds with a unique code that must match that in the vehicle to start. If the codes don't match, the engine will stop immediately to prevent theft.
Modern smart keys and fobs come with an embedded transponder chip that stores electronic security in a format that cannot be duplicated. When the key or fob are placed in the ignition, they transmit this code to the ECU. The ECU is then able to compare it with the code that is stored in its memory and activates the ignition and fuel system circuit if the two coincide. If the codes do not match then the engine will not start even when the ignition circuit is short-circuited by a burglar.
Replacing a fob or a key is a multi-stage procedure that involves accurate cutting of the new blade for the key and programming it to work with the immobiliser system of your vehicle. There are many different immobilisers that are available in various years and models and each one requires an individual programming procedure. We use Ross-Tech to ensure that the replacement key is correctly programmed. This will provide you with the highest level of performance and security.