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How to Replace a Lexus Key Fob That Won't Turn On Or Work Correctly It can be frustrating when your key fob will not function or turn on. Fortunately, there are a few steps you can follow to fix the issue. The first step is to remove the emergency key in metal from the key fob. Use the flat end of a key made from metal to press the cover, then twist it open. Keyless Entry System Keyless entry systems provide a huge benefit for any car owner. They allow you to unlock your car before you even reach a handle or walk out of the passenger door. Some even turn on the lights as you approach. Some will even open the trunk if you are carrying groceries, or any other electronic devices based on proximity. The key fob sends an audio-frequency signal to the receiver inside the car. The receiver will then send back a response code back to the vehicle. The signal is only effective only if the keyfob falls within a certain range, which is typically 50 feet or less. Some of these systems work in a one-way way which means that the key fob is only capable of locking or unlocking the car, but not start the engine. It is recommended to have your keyless entry system installed by a professional regardless of the model. A reputable locksmith for cars will make sure the connection is safe and complete, which includes stripping a small amount of each wire to connect it. The manual will explain which wires to use. A remote that is keyless can also lock the doors if you leave. This is a great feature if are not organized or tend to leave your car locked for too long. Transponder Keys Transponder keys (or transponder chips) are a vital feature in modern vehicles. These chips are integrated into the head of a fob or key and contain a unique code that is linked to your vehicle's immobilizer system. When a key is put into the ignition lock cylinder and then turned to ON, a signal is sent through the antenna ring at the top of your car's ignition to your transponder chip. The chip transmits a code-matching response to the antenna ring. Transponder chips discourage theft, because the key must be properly inserted using the correct code to turn the car on. The keys are also much harder to duplicate, making it less likely that someone will take your car. A reputable locksmith will make transponder key copies that are programed to match the car you own at only a fraction of the price that you spend at a car dealer. They can also provide information on what type of key is in your possession and how to program it. They may be able offer you a replacement key for your lost or stolen transponder. They may also be able to help you reprogramme the chip if it is not working. 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. If this happens, it can be painful and uncomfortable to be locked out of your vehicle or home. To avoid this problem it's essential to have duplicate keys in your possession. These duplicates will assist you to open your lock if you ever need to get stuck. The majority of duplicate keys are engraved or stamped with the “do not duplicate” message. This is a way of letting the public that it is not legal to copy the key unless the owner of the key. Keys are used to open deadbolts and padlocks as well with other door locks. They are also great for keeping track of which key belongs to the particular customer. Many people believe that the “do not duplicate” message on a key makes it more secure. However, this is not the case. The message engraved on the key is merely a warning and has no legal weight. It could discourage some from attempting to duplicate their key. Many chain hardware stores not cut these keys, however a locksmith can easily duplicate the keys. In fact, they can be cut using a replica blank to ensure that the duplicate is authentic. Battery Replacement If your Lexus keyfob is not working it could need to be programmed in order that it is compatible with the immobilizer feature of the vehicle. You'll need to visit the dealer or contact a locksmith who is qualified to reprogram the ECU. Locksmiths usually charge more than the dealership, but you'll save yourself the hassle of towing your car. In addition to the ECU there is a chance that your battery will also need to be replaced. You'll need to replace your old battery with an alternative that is compatible with your car's specific specifications. This includes the physical dimensions, terminal configuration and cold cranking amps (or amp-hour ratings). lost lexus key fob can cause serious damage to your engine and other components. Check the warranty before you purchase a new battery, to determine if the price is covered. You may also want to think about whether you'll require warranty coverage if the battery fails within the warranty period. Additionally, you must keep in mind that automotive locksmiths often don't carry the necessary tools to program keys, and you'll have to find a dealer or an online key programmer come in and program the key for you. Also, it's important to inform them about the kind of key you used (chip or intelligent fob remote “push to start”), the year of your car, as well as the VIN number if it is possible.