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How to Replace a Lexus Key Fob That Won't Turn On Or Work Correctly When you have keys that don't function or turn on it can be very frustrating. There are simple steps you can follow to solve the issue. First remove the metal emergency keys from the key fob. Use the flat end of a key made from metal to press the cover and make it open. Keyless Entry System The keyless entry system is a huge convenience for any car owner. They let you unlock your car before you even touch a handle or step out of the doorway for the passenger. Some even turn on lights when you get close or open the trunk in case you've filled it with groceries, or turn on 10 other electronic gadgets based on your proximity. The key fob sends radio-frequency signals to the receiver inside the car. The receiver then sends back a response code to the vehicle. The signal will only be valid when the key fob is within a specific distance, typically 50 feet or less. Some of these systems are single-way, meaning the key fob will unlock or lock the vehicle, but can't start the engine. It is recommended that you have your keyless entry system installed by a professional regardless of the model. A good automotive locksmith will ensure that the connection is secure and complete, including stripping a small amount of each wire to join it. The manual will explain which wires you need to use. A keyless remote entry can also lock the doors when you leave. This is useful if you aren't organized or have a tendency to leave the car locked for too long. Transponder Keys Transponder keys, also known as transponder chips are a standard feature of modern automobiles. These chips are embedded in the fobs or keys' heads and have an immobilizer number that is unique to each. The antenna ring located at the top of the ignition transmits an alert to the transponder chip when the key is inserted and turned ON. The chip sends an algorithm for code-matching to the antenna ring. lexus replacement key programming are a deterrent to theft, because the key must be inserted correctly with the correct code to turn the car on. These keys are also harder to duplicate, which makes it less likely that someone will steal your vehicle. A locksmith who is reputable can create transponder keys that are programmed for your car at a fraction of what you would spend at a dealership. They can also help understand what type of key you have and how to program it for your car. They may be able offer you a replacement key for your lost or stolen transponder. They may also be able to assist you re-programme your chip if it's stopped functioning. Duplicate keys No matter if they're your car keys or your house key, a majority of people have lost their keys at some time in their lives. When this happens, it can be difficult and frustrating to be locked out of your home or vehicle. It is essential to have duplicate keys to avoid this problem. These duplicates will help you open your lock should you ever find yourself stuck. Most duplicate keys have an “do duplicate” message that is stamped or engraved on the keys. This is a way to let others know that it's not legal to copy keys unless you're the owner of it. These types of keys are often used for padlocks, deadbolts, and other door locks. They are also an excellent tool for keeping an eye on which key of the customer is which. Many people believe that the “do not duplicate” message on a key makes it more secure. However, this is not the case. The engraved message is a warning only and has no legal weight. However, it might discourage some people from trying to have their key duplicated. A majority of chain hardware stores will not cut these keys. However locksmiths are able to duplicate the keys. They can be cut on a blank that resembles similar to the original key to ensure accuracy. Battery Replacement If your Lexus key fob has stopped working, it's likely have to be programmed to work with the immobilizer system of your vehicle. You'll need to go to the dealer or a locksmith that is certified to reprogram the ECU. A locksmith will usually charge more than the dealership, however you'll be able to avoid the headache of towing your vehicle. Aside from the ECU the battery could need to be replaced also. You'll have to replace the old battery with one that meets the specifications of your vehicle. This includes the physical dimensions of the battery, the terminal configuration, and amp-hour rating or cold cranking rating. If you install an incorrect battery it could cause severe damage to the engine and other components. Before purchasing a new battery, be sure to examine the warranty to determine if it covers the cost. You might also want to think about whether you'll need warranty coverage if the battery fails during its warranty period. In addition, you should be aware that automotive locksmiths aren't always equipped with the tools needed to code keys, so you'll have to find an online or dealer key programmer visit and program the key for you. It's also important to tell them know the type of key you want (chip, intelligent, or remote “push-to-start”) and the year that your car was, and the VIN If you have it.