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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 that starts with the push of a button, in time the battery in your key will go out. Replacing it is easy with a paperclip. Simply pop the old battery out, insert the new one (refer to the owner's guide to determine the type of battery you require), and clip it back in the correct position.

Keys

Lexus keys aren't easy to replace and require a professional car key replacement locksmith to create a spare working. This is because every Lexus key contains an electronic chip that needs to be programmed to sync with your vehicle's immobiliser in case it does not. If it doesn't, the vehicle will not be able to start.

It takes a lot time and special equipment for this procedure to be executed correctly. Each model has its own specific programming process. Replacing keys or remotes is a costly service that you should leave to professionals unless you are equipped with the proper tools and know-How To Replace Lexus Key.

You'll need to replace the batteries in your smart key or standard key. Both keys function by turning the barrel of the ignition. It's a simple task to do but you'll need an inexpensive Phillips Screwdriver, 20p coins and paperclip. There are one or two screws on the back of the fob that holds the key. Remove them and store them securely (they are small and easy to lose). The fob can be removed to reveal a circular indentation for the key made from metal, take the battery out (using the paperclip) and then insert the new one making sure that it's pointing the right way up. Then, clip the inside of the key back together.

Remotes

Lexus remotes and fobs can be difficult to replace and require locksmiths who are well-versed and have the proper tools. Certain models require the transponder on the key to be programmed in order to function with the immobiliser system of the car. The chips are programmed using different methods, based on the model of Lexus. This is done using an instrument that sends an electronic signal to the chip which matches the code used to open the doors and start the engine.

Some Lexus models are built with a device that combines the key head and remote. They are easy to replace, as there is no separate chip needed. This type of key is also a bit cheaper.

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 in operation with a little know-how. Start by reading the owner's guide to determine the kind of battery you need and then locate an alternative. Locate a small hole on the inside of the fob. Insert an amount of money (20p is a good choice) into the hole and then twist. You will see a flat surface which you can easily remove using the help of a paperclip.

Then, take the old battery off and insert the new one. Make sure that the replacement battery is inserted in the proper polarity. Clip the two sides of your fob to insert the key metal.

Transponder Chips

Transponder chips are in the keys of nearly all new vehicles manufactured after 1995. They can be used to disable immobiliser systems. The head of a key which is equipped with a transponder chip may be removed to reveal a metal L-shaped key. A replacement key or fob made of a transponder chip is a multi-stage process that includes accurate cutting of the replacement keys as well as programming the transponder chip to synch up with the vehicle's immobiliser.

A transponder is a type of chip with Non-Volatile Memory. It has a set of windings that are fine wires coiled around a tube. They look like those in an electric motor. These windings produce a coded message that the car can read. If the code is correct the car will start.

There are two types of transponder chips. One is known as the 80 bit, and the other is known as a circle + (General Motors). The former is reusable however it must be unlocked by a specific machine in order to function in a different compatible vehicle. The second one is more difficult to use because the old ones can be damaged, broken or removed when key cases are changed. However they can be used with a service-key that doesn't require a battery.

Immobiliser Systems

Immobiliser systems are electronic security devices that prevent thieves from starting up your vehicle. It operates by sending an electronic signal from the car to your key each time you try to start it. The electronic chip in the key responds by sending a unique number of codes that must match the one of the vehicle in order for it to start. If the codes don't coincide, your engine will shut off immediately to prevent theft.

Modern smart keys lexus and fobs have an embedded transponder that stores electronic security information in a format that can't be copied easily. When your key or fob is inserted into the ignition, it transmits the code to a receiver inside the ECU. The ECU then compares it with the code in its memory and activates the ignition and fuel system circuit if they match. If the codes don't match then the engine will not start even when the ignition circuit has been short-circuited by a burglar.

Replacing a lost or damaged key is a multi-stage process that involves precise cutting of the new key blade, and programming it to communicate with the immobiliser system of your vehicle. There are many different immobilisers used in different models and years and each needs an individual programming procedure. We utilize Ross-Tech software to ensure that your replacement key is programmed correctly to ensure optimal performance and security.