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 starts with the push of an arrow, eventually the battery inside your fob will die. It's easy to replace it with a paperclip. Simply pop the battery that is in use and then insert the new one (refer to your owner's manual to determine the type of battery you need) and then secure it back in the correct position.
Keys
Lexus keys are not simple to replace and require a specialist locksmith for replacing car keys to create a working spare. This is because every Lexus key contains microchips that need to be programmed to synchronise with the immobiliser system of your vehicle in case it does not. If it doesn't, the vehicle will not start.
This process takes time and special equipment to execute correctly, and every model has a distinct method of programming. Replacing a key or remote fob is a costly job and should be left to professionals unless you have the appropriate tools and expertise.
You will have to replace the batteries in your smart key or conventional key. Both keys function by turning the barrel of the ignition. This can be done by yourself however you'll need an inexpensive Phillips Screwdriver, a 20p coin and paperclip. You will find one or two screws on the back of the fob for the key. Unscrew them and store them safely (they are small and easy to lose). Remove the fob to reveal a circular indentation for the key made of metal. Take the battery out (using the paperclip) and replace it with the new one making sure that it's pointing the right way up. Then, you can clip the inside of the key back to the fob.
Remotes
Replacing a Lexus remote or fob can be complicated and requires skilled locksmiths who have the right tools and experience. Some models require the transponder on the key to be programmed to allow it to communicate with the immobiliser of the vehicle. The Key Lab are programmed by different methods depending on the model of Lexus. This is done by using a special device which sends a code to the chip to unlock the doors or start the engine.
Certain Lexus vehicles are equipped with a unit that combines the key head and the remote. They are easy to replace because there is no chip that needs to be replaced. This type 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. This can be a very frustrating experience, but it is possible to get your Lexus back to normal with a bit of know-how. Consult the owner's guide to determine the type of battery you need. Then, find the replacement. Locate a small hole on the inside of the fob. Insert a coin (20p is a good choice) into the hole and twist. This should reveal the flat spot, which you can employ a paperclip to take away.
Then, take out the old battery and replace it with the new one. Make sure that the new battery is in the correct direction of operation. Finally, you can clip the inside of the fob back and re-insert the metal key.
Transponder Chips
Nearly all new cars since 1995 have transponder chips in the key head to disarm the immobiliser system. The head of a key that includes a transponder chips can be removed to reveal an L-shaped key. A transponder chip replacement key or fob is a multi-stage procedure. It involves cutting keys precisely and programming the chip to make it sync with the vehicle's immobiliser.
Transponders are electronic device with Non-Volatile Memory (NVM) that houses a set of windings (very fine wire coiled around tubes) which look similar to ones found in an electric motor. These windings produce a coded message that the car read. If the code is valid, then the car will allow you to start it.
There are two types of transponder chips, the first is called the 80-bit while the other is known as the circle + (General Motors). The first is reusable but it needs to be unlocked with a special device to function in a compatible vehicle. The latter is more difficult as the old keys are often damaged and drilled or discarded after key cases are replaced. They can be salvaged however and then used to create a service key that doesn't require batteries to function.
Immobiliser Systems
Immobiliser systems are electronic security devices that prevent thieves from starting your car. It operates by sending a signal from the car to the key when you attempt to start it. The chip inside the key responds by sending a unique number of codes that must match that of the vehicle to allow it to start. If the codes do not match, your engine will shut down immediately to stop theft.
Modern smart keys and fobs come with embedded transponder chips that stores electronic security in a format that can't be duplicated. When your fob or key is put into the ignition, it transmits this code to a receiver inside the ECU. The ECU then compares it with the code in its memory, and activates the ignition system and fuel circuit if they coincide. If the codes do not match, the engine will not start even in the event that the ignition circuit is short-circuited by a thief.
The process of replacing keys or fobs involves a multi-stage procedure that includes cutting the new blade with precision and programming it to ensure that it works with the car's system. Every immobiliser system is unique and has its own programming procedure. We employ Ross-Tech to ensure that the replacement key is programmed correctly. This will provide you with maximum performance and security.