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How to Replace a Lexus Key Fob That Won't Turn On Or Work Correctly It can be a hassle when your key fob will not work or turn on. There are a few easy steps that you can follow to resolve the problem. The first step is to remove the emergency key in metal from the key fob. Use the flat end of a key made of metal to press the cover down and turn it to open. Keyless Entry System The keyless entry system can be a great convenience for any car owner. You can unlock your car when you even leave the door for passengers. Some of them will even turn on the light when you get close. Some will even open the trunk when you're carrying groceries or other electronic devices that are based on proximity. The key fob sends an audio frequency signal to the receiver inside the car, which in turn sends an answer code back to the vehicle. The signal is only effective if the keyfob is within a particular area, usually 50 feet or less. Some of these systems work in a one-way way, which means that the key fob will only be able to lock or unlock the vehicle, but not start the engine. It is recommended that you have your keyless entry system professionally installed regardless of the model. A good automotive locksmith will assure that the connection is completely and secure, even if it requires stripping a small part of each wire. The manual will inform you the wires you should use. The Keylab can also lock the doors when you walk away. This is useful for those who forget and leave their vehicle unlocked for too long. Transponder Keys Transponder keys or transponder chips are an aplenty feature in modern vehicles. These chips are integrated into the head of a key or fob and include a unique code that's linked to your car's immobilizer system. When a key is put into the ignition lock cylinder and then turned to ON, a signal is sent from the antenna ring on the top of your car's ignition to your transponder chip. The chip then sends a response back to the antenna ring that matches your car's code. The use of a transponder chip deters theft because the key must be inserted correctly and have the correct code to allow your car to turn on. These keys are also harder to duplicate, making it less likely that someone will steal your vehicle. A reliable locksmith can create transponder keys which are programmed for your car at a fraction of what you would spend at a dealership. They can also assist you understand what type of key you own and how to program it for your car. They might be able to offer you a new key for your lost or stolen transponder. They can even help you re-programme your chip if it's not functioning. Duplicate Keys A majority of people have lost their keys at one point or another in their lives, whether it was their keys to their car or house keys. When this occurs, it's painful and uncomfortable to be locked out of your vehicle or home. It's important to have duplicate keys to avoid this situation. These duplicate keys can be used to open your lock and help gain access if you're in a pinch. Most duplicate keys feature a “do duplicate” message engraved or stamped on them. This is to inform others know that it is unlawful to duplicate a key, unless the owner is. Keys are used to open padlocks and deadbolts as for other door locks. They are also an excellent method of keeping an eye on which key belongs to the particular customer. Many people believe that the “do not duplicate” message on keys makes them more secure. But this isn't true. The message on these keys is an indication and does not have any legal value. However, it may dissuade some people from trying to have their key duplicated. Some chain hardware stores not cut these keys, however locksmiths can easily duplicate them. In fact, they can be cut on a similar blank to ensure that the duplicate is authentic. Battery Replacement If your Lexus keyfob is not working it may need be reprogrammed to ensure it can function with the immobilizer system of your vehicle. You'll need to call an locksmith or a dealer to program the ECU. Typically, a locksmith will cost more than a dealership, however they'll also save you the hassle of towing your vehicle there. In addition to the ECU It is also possible that your battery will need to be changed. You'll have to replace your old battery with one that meets the specifications of your car. This includes the physical dimensions, terminal configuration and cold cranking amps (or amp-hour ratings). If you install an insufficient battery it could cause serious damage to the engine as well as other components. Verify the warranty prior to you purchase a new battery to determine if the price is covered. You should also consider whether you need a warranty in case the battery fails within its coverage period. Also, keep in mind that many auto locksmiths do not have the tools needed to code keys. Therefore, you'll have to find a dealer to program your key or make use of an online key programmer. It is also important to inform them of the type of key you had (chip, intelligent fob, remote “push to start”), the year of your car, as well as the VIN number, if applicable.