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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 function or switch off. There are some simple steps that you can follow to fix the issue. The first step is to remove the emergency key made of steel from the key fob. Then you can use the flat end of the key to press and twist the cover open. Keyless Entry System The keyless entry system is a wonderful benefit for any car owner. They let you unlock your vehicle before you even touch the handle or open the doorway for the passenger. Some even turn on lights when you approach, open the trunk if it's filled with groceries, or activate 10 other electronic devices based on your proximity. The key fob transmits an radio-frequency signal to a receiver inside the car. The receiver then sends back a response code to the vehicle. The signal is only effective only if the keyfob falls within a specified range, which is usually 50 feet or less. Certain systems work in a one-way manner which means that the key fob is only capable of locking or unlocking the car, but not start the engine. No matter what type of keyless entry system that you choose It is recommended to have it professionally installed. A reputable locksmith for cars will make sure that the connection is complete and secure, even if that requires stripping a small part of each wire. The manual will inform you which wires to use. Another benefit of remotes with keyless entry is that it can also lock your doors automatically when you walk away from the car. This is helpful if are prone to forgetfulness or tend to leave the car locked for too long. Transponder Keys Transponder keys (or transponder chips) are an important feature in most modern cars. The chips are incorporated into the head of the key or fob and contain an immobilizer number that is unique to each. When a key is inserted into the ignition lock cylinder and turned to ON and a signal is sent through the antenna ring at the top of your vehicle's ignition to the transponder chip. The chip then sends an answer back to the antenna ring that matches your car's code. The transponder chip can deter theft because the key must be inserted correctly and have the right code to enable your car turn 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 keys that are programed to match the car you own at less than the price you'd spend at a car dealer. They can also assist you to understand what type of key you own and how to program it to match your car. They might also be able to offer you an alternative to your stolen or lost transponder key. They may even be able to help to reprogramme the chip if it's stopped functioning. Duplicate Keys Many people have lost keys at some point in their lives regardless of whether it was their car keys or their home keys. When this occurs, it's frustrating and inconvenient to be locked out of your home or vehicle. It is important to have two keys available in order to avoid this situation. These duplicates will assist you to unlock your lock if you ever become stuck. replace lexus key are engraved or stamped with the “do not duplicate” message. This is a way to alert others know that it is not legal to copy a key unless the owner of the key is present. These kinds of keys are often used for deadbolts, padlocks, and other door locks. They also provide great for keeping an eye on which key belongs to the particular customer. Many people believe that the “do not duplicate” message on the key makes it more secure. However, this isn't the case. The message that is engraved on the keys is an alert and does not have any legal weight. It could discourage some from attempting to duplicate their key. Some chain hardware stores refuse to cut the keys, however locksmiths are able to duplicate them. In fact, they could be cut on a similar blank to ensure that the duplicate is accurate. Battery Replacement If your Lexus key fob isn't functioning, it's likely that it will require reprogramming to work with the vehicle's immobilizer. You'll need to call a locksmith or your dealer to change the ECU. Typically, a locksmith will cost more than a dealership, however they'll also save you the headache of having to take your vehicle there. In addition to the ECU there is a chance that your battery needs to be changed. You'll need to replace your old battery with one that matches the specifications of your vehicle. This includes the physical dimensions, terminal configuration, and cold cranking amps (or amp-hour rating). The wrong battery installation can cause serious damage to your engine as well as other components. If you are considering purchasing a replacement battery, make sure to examine the warranty to determine whether it covers the cost. You'll also want to consider whether you require a warranty in the event that the battery fails within its warranty period. Also, be aware that auto locksmiths usually don't have the necessary tools to program keys, and you'll have to either have a dealer or an online key programmer visit and program the key for you. It's also important to inform them know the type of key you want (chip or intelligent remote, or “push-to-start”) as well as the year your car was and the VIN in the event that you can.