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How to Replace a Lexus Key Fob That Won't Turn On Or Work Correctly If you're stuck with a key fob that will not function or turn on it can be very frustrating. There are simple steps you can follow to resolve the problem. The first step is to take the emergency key made of steel from the key fob. Then make use of the flat end of the key to press and open the cover. Keyless Entry System The keyless entry system is a huge convenience for any car owner. They allow you to unlock your vehicle before you even reach a handle or step out of the doorway for the passenger. Some of them will even turn on the light when you get close. Others will open the trunk when carrying groceries or 10 other electronic devices that are based on proximity. The key fob sends an radio-frequency signal to a receiver in the car. The receiver then sends back a response code back to the vehicle. The signal will only be valid if the key fob is within a certain range, usually about 50 feet or less. Certain systems work in a single-way mode 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 professional locksmith in the automotive industry will assure that the connection is safe and secure, even if that involves stripping a small portion of each wire. The instructions manual will provide you with the exact wires to use and it is crucial that you only use ones required. Keyless remote entry can also lock the doors if you leave. This is helpful for people who forget and tend to leave their car unlocked long enough. Transponder Keys Transponder keys or transponder chips are a common feature of modern automobiles. They are embedded in the head of a fob or key and contain a unique number that is connected to your vehicle's immobilizer system. The antenna ring located at the top of the ignition transmits signals to the transponder chips when the key is inserted and turned ON. The chip then sends a response back to the antenna ring that matches the car's code. Transponder chips are a deterrent to theft, because the key must be correctly inserted with the proper code to turn your car on. It's also much more difficult to duplicate these keys, making it less likely that someone is able to steal your car. A locksmith who is reputable can make transponder keys that can be programmed for your vehicle at a fraction of what you'd pay at an auto dealer. They can also help you identify the type of key you own and how to program it to your car. They might even be able to give you a new key for your stolen or lost transponder. They can also help you with reprogramming the chip in case it has stopped working. Duplicate keys Many people have lost keys at some time in their lives whether it was car keys or house keys. It can be frustrating to be locked out of your home or car. It's essential to have duplicate keys on hand to avoid this issue. These duplicate keys can be used to unlock your lock and allow you to get inside if you're ever in a bind. Most duplicate keys have the “do duplicate” message that is stamped or engraved on the keys. This is to inform others know that it is not legal to duplicate keys 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 a key makes it more secure. However, this is not true. The engraved message is a warning only and has no legal weight. However, it could deter some people from attempting to have their key duplicated. Many chain hardware stores will not cut these keys, but a locksmith can easily duplicate them. In lexus key fob replacement , they can even be cut on a similar blank to ensure that the duplicate is correct. Battery Replacement If your Lexus keyfob is not working it may need be programmed in order that it is compatible with the immobilizer system in the vehicle. You'll have to visit the dealer or a locksmith who is qualified to reprogram the ECU. Locksmiths typically cost more than the dealership, but you'll avoid the hassle of towing your car. Aside from the ECU and the battery, it could need to be replaced also. You'll have to replace the old battery with an alternative that is compatible with the specifications of your vehicle. This includes the physical size as well as the terminal configuration and amp-hour rating or cold cranking rating. If you install an insufficient battery it could cause significant damage to the engine as well as other components. Verify the warranty prior to you buy a new battery to see if the cost is covered. You may also want to consider whether you'll need a warranty if the battery fails during the warranty period. Also, keep in mind that many automotive locksmiths don't have tools required to program keys. So, you'll have to find a dealer to program your key or employ an online key programming tool. It's also important to let them know what kind of key (chip or intelligent remote, or “push-to-start”) as well as the year your car was, and the VIN if you can.