Lexus Key Replacement - Replacing a Remote Or Fob

If you have a traditional Lexus key that turns in the ignition, or a smart key for your car, which starts with the press of one button, eventually the battery inside the fob will deplete. Replacing it is easy with a paperclip. Simply pop the existing battery out and replace it with the new one (refer to your owner's manual to determine which kind of battery you need) and then secure it back into the correct position.

Keys

Lexus keys aren't simple to replace and require a professional locksmith to replace your car key to create a spare working. This is due to the fact that every Lexus key contains microchips that need to be programmed to sync with the immobiliser of your vehicle and if it's not, it'll not be able to start.

This procedure takes time and specialized equipment to complete properly, and each model has its own method of programming. Replacing a remote or key fob is a costly job and should be left to professionals unless you have the right tools and know-how.

It doesn't matter if you have a standard key that rotates in the ignition barrel or an electronic key that starts the car at the push of a button they will both eventually need their batteries replaced. It's a simple task to do but you'll need a small Phillips Screwdriver, a coin worth 20p 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). Take the fob off, revealing an indentation of a circular shape where the metal key will be. Take the battery out with the help of a paperclip. Insert the new lexus key battery, making sure that it is inserted correctly. Clip the the key to secure it.

Remotes

Lexus remotes and fobs aren't easy to replace and require locksmiths who are skilled and possess the appropriate tools. Some models require that the transponder chip in the key be programmed in order to work with the vehicle's immobiliser system. The lexus rx300 key cutting models use different methods to program these chips. This is accomplished by using a specific device that sends a code to the chip to unlock the doors or to start the engine.

Some Lexus cars are designed with a single piece of hardware that consists of the key head and the remote. These are more simple to replace since no separate chip is required. This kind of key may also be a little less expensive.

All fobs eventually lose their battery power, no matter the type of key. It can be frustrating however with a little knowledge you can get your Lexus Key Programming up and running again. Read the owner's guide to determine what type of battery you need. Then, find an alternative. Find a small opening on the inside of your fob. Insert an amount of money (20p is a good choice) into the hole and twist. You should be able to see a flat surface that you can remove with an ordinary paperclip.

Next, pop the old battery off and insert the new one. Make sure that the new battery is inserted with the correct orientation. Finally, cut the inside of the fob back to its original position and replace the key with the metal.

Transponder Chips

Most new cars built since 1995 have transponder chips inside the key head that allow it to deactivate the immobiliser system. The head of a key that has a transponder chip can be removed to reveal a steel L-shaped key. A transponder chip replacement key or fob is a multistage process. It involves cutting keys precisely and programming the chip to sync up with the vehicle immobiliser.

A transponder is an electronic chip with Non-Volatile Memory (NVM) that has a set of windings (very fine wire that is wrapped around tubes) which look similar to ones found in an electric motor. These windings produce a coded message that the car is able to read. If the code is correct the car will start.

There are two types of transponder chip, the first is called the 80-bit and the other is called the circle + (General Motors). The first can be reused, but has to be unlocked with a special machine to function on a vehicle that is compatible with the. The latter is more difficult, as the older ones are often broken or drilled through, or discarded after key cases are replaced. However, they can be used with a service-key which doesn't require a battery.

Immobiliser Systems

Immobiliser systems are electronic security devices which prevent thieves from starting your vehicle. It works 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 with a unique code that must match that of the vehicle to start. If the codes aren't compatible, the engine will stop immediately, preventing theft of your vehicle.

Modern smart keys and fobs feature an embedded transponder chip that stores security information in a format that can't be duplicated. When your fob or key is installed in the ignition it transmits this code to a receiver inside the ECU. The ECU compares this code with the one that is stored in its memory, and activates the fuel system and the ignition circuit if they are compatible. If the codes don't match, the engine will not start, even if a burglar tries to short-circuit the ignition circuit.

The procedure of replacing the fob or key requires an entire process that involves cutting the new key blade with precision and programming it to ensure that it can be synced with your car's system. There are a variety of immobiliser systems that are used in different models and years, and each requires its own unique programming procedure. We utilize Ross-Tech software to ensure that your replacement key is programmed correctly to ensure the best performance and security.