Lexus Key Replacement - Replacing a Remote Or Fob
Whether you have a conventional Lexus key that turns on the ignition or a smart key for your car, which starts by pressing a button, eventually the battery in your fob will run out. Replacing it is as simple as using a paperclip. Pop the old battery out, insert the new one (refer to the owner's guide to determine which battery you need), and clip it back in place.
Keys
Lexus keys aren't easy to replace and require a professional locksmith for replacing car keys to make a functioning spare. This is because each Lexus key contains an embedded microchip that must be programmed in order to synchronise with the immobiliser of your vehicle If it is not, the car will not be able to start.
It takes a lot time and specialized equipment to allow this process to be done correctly. Each model has its own programming procedure. Replacing a lost or damaged key or fob is a cost-effective service and one you should leave to experts unless you have the appropriate tools and experience.
You'll have to replace the batteries in your smart key or standard key. Both keys operate by turning the barrel of the ignition. It's easy to do it yourself, but you will need a small Phillips Screwdriver, a coin worth 20p and paperclip. On the back of the fob, you will find two or more screws, unscrew them and put them somewhere safe (they're small and easily lost). The fob is removed, revealing an indentation of a circular shape where the key's metal part will be. Remove the battery using the paperclip and insert the new battery, making sure that it is inserted correctly. Then clip the inside of the key back to the fob.
Remotes
Lexus remotes and fobs can be difficult to replace and require locksmiths who are both well-versed and have the proper tools. Certain models require the transponder within the key to be changed to allow it to communicate with the immobiliser of the vehicle. The Lexus models use different methods to program these chips. This is accomplished by using a special device that sends a code to the chip to unlock the doors or start the engine.
Some Lexus vehicles are equipped with a key head that is a combination of the key head and remote. They are easy to replace since there is no separate chip to replace. This kind of key could also be a little less expensive.
Regardless of the key type, all fobs eventually run out of battery power. It can be quite frustrating, but with a little knowledge you can get your Lexus back to normal. The first step is to consult the owner's manual to determine what type of battery you need and find the replacement. Then, find small holes in the inside of the fob. insert the coin (a 20p piece works best) and twist. The fob should be revealed as a flat spot that you can utilize a paperclip to take away.
Then, take the old battery out and insert the new one. Be sure the replacement battery is in the correct orientation. Clip the two sides of your fob together and insert the key made of metal.
Transponder Chips
Transponder chips can be found in key heads of almost all new cars manufactured since 1995. They can be used to disarm immobiliser systems. The head of a key which is equipped with a transponder chip may be removed to reveal a metallic L-shaped key. Having a replacement key or fob with transponder chips is a multi-stage method that involves precise cutting of replacement keys as well as programming the transponder chip so that it can synch up with the vehicle's immobiliser system.
A transponder is an electronic chip equipped with Non-Volatile memory (NVM) that contains a set of windings (very fine wire twisted around tubes) which look similar to ones found in an electric motor. These windings transmit a message that the car can read. If the code is correct, the car will start.
There are lexus car keys of transponder chips. One known as the 80 bit and the other referred to as a circle + (General Motors). The first is reusable but needs to be unlocked by a machine that is specially designed to function in a compatible vehicle. The second type is more difficult to use as the older keys could be broken, drilled, or removed when key cases are changed. They can be salvaged however for use with a service key that doesn't need a battery to function.
Immobiliser Systems
Immobiliser systems are electronic security measures that stop thieves from starting up your vehicle. It operates by sending a signal from the vehicle to your key when you attempt to start it. The electronic chip inside the key responds by sending a unique code which must match the one of the vehicle in order for it to start. If the codes don't match, your engine will stop immediately and stop the theft of your car.
Modern smart keys and fobs have an embedded transponder that stores electronic security information in a format that is not easily copied. When the fob or key are inserted into the ignition, they send this code to the ECU. The ECU then compares it with the code stored in its memory and activates the ignition and fuel system circuit if they coincide. If the codes don't match the engine won't start even when the ignition circuit has been cut off by a criminal.
The process of replacing a key or fob involves a multi-stage process that includes cutting the new key blade accurately and programming it so that it syncs with the car's system. Each immobiliser system is unique and has its own programming procedure. We use Ross-Tech software to ensure that your replacement key is programmed correctly to ensure optimum performance and maximum security.