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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 doesn't work or switch off. Fortunately, there are a few steps you can use to fix the issue. The first step is to remove the metal emergency key from the key fob. Then, use the flat end of the key made of metal to press and then twist the cover to open. Keyless Entry System Keyless entry systems are a great option for anyone who owns a car. They let you unlock your car before you even touch the handle or walk out of the doorway for the passenger. Some even turn on the lights when you approach, open the trunk if you have it loaded with groceries, or turn on 10 other electronic accessories in response to your proximity. The key fob transmits a radio frequency signal the car's receiver and it then transmits an answer code back to the vehicle. The signal will only be valid when the key fob is within a specific range, typically 50 feet or less. Some of these systems are one-way, meaning the key fob will unlock or lock the vehicle, but it can't start the engine. No matter what type of keyless entry system you pick it is recommended to have it professionally installed. A professional locksmith in the automotive industry will make sure the connection is safe and complete, which includes stripping a small portion of each wire before connecting it. The instructions manual will outline the exact wires to use and it is crucial that you only use ones needed. Another perk of keyless remote access is that it can also lock your doors automatically when you walk away from the car. This is beneficial for those who are forgetful and often leave their vehicle unlocked for all day. Transponder Keys Transponder keys, also known as transponder chips are a typical feature in modern automobiles. They are embedded into the fobs or keys' heads and include an immobilizer code that is unique to. When a key is placed into the ignition lock cylinder and turned to ON the signal is transmitted from the antenna ring on the top of your vehicle's ignition to your transponder chip. The chip transmits an answer back to the antenna ring that matches the car's code. The transponder chip discourages theft because the keys must be put in correctly and have the right code for your car to turn on. It's also harder to duplicate the keys, making it less likely that someone can take your vehicle. A reputable locksmith can make transponder key copies that are programmed to match your vehicle at only a fraction of the price that you would pay at a dealership for cars. They can also provide information on the type of key in your possession and how to program it. They may also be able to provide you an alternative to your lost or stolen transponder key. They can even help you reprogramme your chip if it's stopped working. Duplicate Keys Whether it's your car keys or house keys, the majority people have lost their keys at some point in their lives. If this happens, it's uncomfortable and frustrating to be locked out of your car or home. It's important to have duplicate keys in order to avoid this problem. These duplicates can be used to open your lock and help you gain access if you're in a bind. The majority of duplicate keys have the “do duplicate” message engraved or stamped on them. This is to inform others know that it is not legal to copy a key unless the owner is. These types of keys are usually used to open padlocks, deadbolts and other door locks. These keys are also an excellent tool for keeping track of which customer's key is which. Many people believe that the “do not duplicate” message on the key makes it more secure. But, this isn't the case. The engraved message is only a warning and does not carry any 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 can easily replicate the keys. They can be cut on a blank that resembles like the original, to ensure the accuracy. Battery Replacement If your Lexus keyfob is not working it may need be programmed in order it can function with the immobilizer system of the vehicle. You'll have to go to the dealer or a locksmith that is certified to reprogram the ECU. Most locksmiths charge more than a dealership, however they'll also spare you the hassle of having to tow your car there. In addition to the ECU the battery could need to be replaced too. You'll need to replace the old battery with a new one that matches the specifications of your car. This includes the physical dimensions, terminal configuration, as well as cold cranking amps (or amp-hour ratings). Installing the wrong battery can cause serious damage to your engine as well as other components. Before purchasing a replacement battery, make sure to look over the warranty to determine whether it covers the cost. lexus key fobs may also want to think about whether you'll require an insurance policy if the battery fails within its warranty. Also, be aware that auto locksmiths often don't carry the necessary tools to program keys, so you'll need to have a dealer or online key programmer come in and program the key for you. It's also important to let them know what kind of key you want (chip, intelligent, or remote “push-to-start”), the year of your car, and the VIN should you be able to.