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 that starts by pressing one button, eventually the battery inside your fob will die. It's simple to replace it using an ordinary paperclip. Simply remove the battery that was in use, and then insert the new one (refer to the owner's manual to determine the type of battery you require), then clip it back into place.
Keys
Lexus keys can be difficult to replace. A professional locksmith is required to create an appropriate replacement that functions. This is because every Lexus key contains an electronic chip that needs to be programmed to work in conjunction with your vehicle's immobiliser in case it does not. If it doesn't, the vehicle will not be able to start.
This process requires time and special equipment to execute right, and each model has a different programing procedure. Replacing a key or a remote fob is a cost-effective service and one you should leave to professionals unless you possess the appropriate tools and expertise.
You'll need to replace the batteries in your smart key or conventional key. Both keys work by turning the barrel of the ignition. This can be done yourself but you'll need the smallest Phillips Screwdriver, 20p coin and paperclip. There are two or three screws on the back of the fob that holds the key. Unscrew them, and store them safely (they are small and easy to lose). Take the fob off to reveal an indentation that is circular for the metal key, pop the battery out (using the paperclip) and replace it with the new one making sure it's the correct way up. Clip the inside of the key to secure it.
Remotes
Replacing the Lexus remote or fob is a complicated process and requires expert locksmiths with both the right tools as well as knowledge. Some models require that the chip inside the key be reprogrammed to function with the immobiliser system of the car. The Lexus models employ different methods to program these chips. This is done by using a special device which transmits a specific code to the chip to unlock the doors or to start the engine.
Certain Lexus cars are equipped with a single unit that incorporates the key head and remote. These are simpler to replace as there is no separate chip. lexus key fob of key is also less expensive.
All fobs eventually lose battery power, regardless of the type of key. This can be a very frustrating situation, but it's possible to get your Lexus back on track with a little knowledge. First, consult the owner's manual for the kind of battery you need and locate an alternative. Find a small hole on the inside of the fob. Insert a coin (20p works well) into the hole and twist. The fob should be revealed as an unflattened area that you can use a paper clip to take away.
Next, pop the old battery off and insert the new one. Make sure to insert the battery with the proper polarity. Clip the two sides of the fob together, then insert the metal key.
Transponder Chips
The majority of new cars since 1995 have transponder chips inside the key head to disable the immobiliser system. The head of a key that contains a transponder chip is able to be removed to reveal a metallic L-shaped key. Having a replacement key or fob with transponder chips is a multi-stage method that includes accurate cutting of the replacement keys and programming of the transponder chip to synch up with the vehicle's immobiliser system.
A transponder is an electronic chip that has Non-Volatile Memory (NVM) that contains a set of windings (very fine wire wrapped around tubes) that resemble ones found in an electric motor. These windings form a coded signal that the car can read. If the code is correct the car will begin to move.
There are two kinds of transponder chips, one known as the 80 bit, and the other one is called a circle + (General Motors). The first type is reusable, but it must be unlocked using a special machine to function in a different vehicle that is compatible. The second is more difficult to use since the older keys could be broken, drilled, or removed when key cases are changed. They can be salvaged however and used with a service key that does not require a battery to operate.
Immobiliser Systems
Immobiliser systems are electronic security measures that stop thieves from starting your car. It works by sending an electronic signal from the car to the key whenever you attempt to start it. The chip inside the key responds by transmitting a unique code that must match the one of the vehicle to allow it to start. If the codes don't match, the engine will stop immediately and stop the theft of your car.
Modern smart keys and fobs have an embedded transponder, which stores electronic security information in a format which is not easily copied. When your fob or key is placed in the ignition, it transmits this code to a receiver within the ECU. The ECU examines the code against the one in its memory and activates both the fuel system as well as the ignition circuit if they match. If the codes do not match then the engine will not start, even in the event that the ignition circuit is short-circuited by a burglar.
Replacing a fob or a key is a multi-stage procedure that involves precise cutting of the new blade of the key and programming it to communicate with your car's immobiliser system. Each immobiliser system is distinct and has its own programming procedure. We utilize Ross-Tech software to ensure that your replacement key is programmed correctly to ensure maximum performance and security.