Lexus Key Replacement - Replacing a Remote Or Fob
If you own a traditional Lexus key that is used to turn on the ignition, or a smart key for your car, which starts with the push of one button, eventually the battery inside the fob will deplete. Replacing it is easy with using a paperclip. Pop the old battery out, insert the new one (refer to the manual for your owner to determine which battery you need) and then clip it back into the correct position.
Keys
Lexus keys can be difficult to replace. A professional locksmith is needed to make an original replacement that works. This is because each Lexus key contains a microchip that needs to be programmed to work in conjunction with the immobiliser of your vehicle - if not it will not be able to start.
This procedure takes time and special equipment to do right, and each model has a different procedure for programming. Replacing a key or remote fob can be a costly task and one you should leave to professionals unless your have the proper tools and knowledge.
You'll need to replace the batteries in your smart key or standard key. Both keys work by turning the barrel of the ignition. It's easy to do it yourself however, you'll require an inexpensive Phillips Screwdriver, 20p coin and paperclip. There are one or two screws on the back of the key fob. Unscrew them, and keep them safe (they are small and easy to lose). Remove the fob and you will see an indentation that is circular for the key made of metal. Pop the battery out (using the paperclip) and then put in the new one, making sure that it's pointing the right way up. Clip the inside of the key to secure it.
Remotes
Replacing the Lexus remote or fob can be complicated and requires skilled locksmiths with the right tools as well as knowledge. Some models require that the transponder chip in the key be changed in order to work with the vehicle's immobiliser system. These chips are programmed using different methods depending on the model of Lexus. This is done with a specific device that sends an electronic signal to the chip that matches the code used to unlock the doors and start the engine.
Certain Lexus cars are equipped with a single unit that consists of the key head and remote. These are easier to replace since there is no separate chip. This type of key can also be a bit less expensive.
All fobs eventually lose their battery power, regardless of the kind of key. It can be a frustrating experience however with a little knowledge you can get your Lexus back to normal. Read the owner's guide to determine the type of battery you require. Then, find a replacement. Find a small opening on the inside of your fob. Insert an amount of money (20p is a good choice) into the hole and then twist. You should see an area flat that you can take out with a paperclip.
Then, pull the old battery out and insert the new one. Make sure you insert the battery in the correct orientation. Clip the two sides of your fob and insert the key metal.
Transponder Chips
Most new cars manufactured after 1995 have transponder chips in the key head that allow it to deactivate the immobiliser system. If you have a key with a chip in it the head has a plastic cover that can be taken off to reveal an L-shaped key. A replacement key or fob with transponder chips is a multi-stage procedure that includes precise cutting of replacement keys and programming the transponder chip so that it can synch up with the vehicle's immobiliser.
A transponder is a device that has Non-Volatile Memory. It is comprised of a set of windings, which are very delicate wires that are twisted around the tube. They resemble the ones in an electric motor. These windings form a coded signal for the car to read. If the code is valid, then the car will allow you to start it up.
There are two types of transponder chips, the first is called the 80-bit while the other is called the circle + (General Motors). The first is reusable, but it must be removed using a special machine in order to work in a different vehicle that is compatible. The second type is more difficult to use due to the fact that the older keys could be damaged, broken or toss out when keycases are changed. However, they can be utilized with a service key that doesn't require a battery.
Immobiliser Systems
An immobiliser is an electronic security measure that stops thieves from starting your vehicle. It works by sending an electronic signal from the car to the key whenever you attempt to start it. The electronic chip in your key responds by sending a unique code that must match that of the vehicle in order to start. If the codes don't coincide, your engine will shut off immediately to prevent theft.
Modern smart keys and fobs have embedded transponder chips that stores electronic security in a format that can't be easily duplicated. When the key or fob is inserted into the ignition, they transmit this code to the ECU. The ECU is then able to compare it with the code stored in its memory. It then activates the fuel system and ignition circuit if the two coincide. If the codes don't match, your engine won't start - even if someone tries to short-circuit the ignition circuit.
The process of replacing the fob or key involves a multi-stage procedure that includes cutting the new key blade accurately and programming it to ensure that it is compatible with your car's systems. There are lexus replacement key that are used in different models and years and each one requires its own unique programming procedure. We employ Ross-Tech to ensure that the replacement key is programmed correctly. This will ensure the best performance and security.