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, which starts by pressing a button, eventually the battery inside your key will go out. The replacement process is simple 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 battery you need), and clip it back in place.

Keys

Lexus keys aren't always easy to replace. A specialist locksmith is needed to make an appropriate replacement that functions. This is because every Lexus Car Key key has microchips that need to be programmed to synchronise with your vehicle's immobiliser system If it is not, the car will not be able to start.

This procedure takes time and special equipment to do correctly, and each model has a different programming procedure. Replacing a key or remote fob is a cost-effective service and one you should leave to professionals unless you have the proper tools and knowledge.

You will have to replace the batteries in your smart key or traditional key. Both keys function by turning the barrel of the ignition. You can save money by doing this yourself but it will require the use of a small Phillips screwdriver and the coin (a 20p piece works well) and a paperclip. There are one or two screws on the back of the key fob. Unscrew them, and keep them safe (they are small and easy to lose). Take the fob off, revealing an indentation of a circular shape where the key made of metal will be. The battery can be removed with the paperclip, and then insert the new battery, making sure that it's properly inserted. Then clip the inside of the key back to the fob.

Remotes

lexus key fob price remotes and fobs aren't easy to replace and require locksmiths who are knowledgeable and have the right tools. Certain models require that the chip inside the key be reprogrammed to function with the car's immobiliser system. The Lexus models use different methods to program these chips. This is done by using a specific device that sends an electrical signal to the chip which matches the code used to open the doors and start the engine.

Some lexus car key cars are designed with a single piece of hardware that includes the key head as well as the remote. These are much easier to replace because no separate chip is required. This type of key is also a bit cheaper.

Regardless of the key type regardless of the type of key, all fobs eventually run out of battery power. It can be very frustrating but with a little know-how you can get your Lexus up and running. Read the owner's guide to determine which battery type you need. Find the replacement. Find a small hole on the inside of the fob. Insert a coin (20p is a good choice) into the hole and then twist. This should reveal an unflattened area that you can utilize a paperclip to remove.

Then, take out the battery that was used and replace it with the new one. Make sure you insert the battery with the proper polarity. Finally, clip the inside of the fob back to its original position and reconnect the key to the metal.

Transponder Chips

More or less all new cars built since 1995 have transponder chips within the key head to disable the immobiliser system. If you have a key with a chip, the head is covered with a plastic cover that is able to be pulled off to reveal an L-shaped metal key. The process of getting a replacement key fob made of a transponder chip is a multi-stage procedure that involves precise cutting of replacement keys and programming the transponder chip to link up with the vehicle's immobiliser.

A transponder is an electronic chip with Non-Volatile Memory (NVM) that houses a set of windings (very fine wire wrapped around tubes) which look similar to ones in an electric motor. The windings are coded to create a signal that the car can read. If the code is correct the car will begin to move.

There are two types of transponder chips. One called the 80 bit and the other one is called a circle + (General Motors). The first is reusable, but must be unlocked with a special machine in order to work in a different vehicle that is compatible. The second type is more difficult to use as the old ones can be broken, drilled or toss out when keycases are changed. They can be salvaged, however and used with a service key that doesn't need a battery to operate.

Immobiliser Systems

An immobiliser system is an electronic security measure which prevents thieves from opening your car. It works by sending an electronic signal from the vehicle to the key every time you attempt to start it. The chip inside your key then responds with an unique code that must match the one in the vehicle in order to start. If the codes don't match, the engine will shut down immediately, preventing theft of your car.

Modern smart keys and fobs feature embedded transponder chips that stores electronic security in a format that cannot be easily duplicated. When the key or fob are placed in the ignition, they send this code to the ECU. The ECU is able to compare this code with the one in its memory, and then activates both the fuel system as well as the ignition circuit if they match. If the codes do not match, the engine won't start - even if an armed robber attempts to short-circuit the ignition circuit.

The process of replacing a key or fob involves a multi-stage process that includes cutting the new key blade accurately and programming it to ensure that it works with your car's systems. Each immobiliser system is unique and has its own programming procedure. We utilize Ross-Tech software to ensure that your replacement key is programmed correctly for maximum performance and security.