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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 work or will not turn on. There are simple steps you can follow to resolve the problem. The first step is to take the metal emergency key from the key fob. Then you can use the flat end of the metal key to press and then twist the cover to 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 lever or walk out of the doorway for the passenger. Some even turn on the light as you approach. Some will even open the trunk if you are carrying your groceries or 10 other electronic devices that are based on proximity. The key fob sends a radio frequency signal to the receiver inside the car and then sends an answer code back to the vehicle. The signal is only effective if the keyfob is within a specific distance, which is typically 50 feet or less. Certain systems operate in a one-way manner which means that the key fob will only be capable of locking or unlocking the vehicle, but not start the engine. Whatever keyless entry system you pick it is advised to have it installed by a professional. replacement lexus keys will ensure that the connection is solid and secure, as well as stripping a small amount of each wire to join it. The manual will explain which wires you need to use. Another benefit of keyless remote access is that it can also lock your doors automatically when you step away from your car. This is helpful if you are forgetful or tend to leave the car unlocked for too long. Transponder Keys Transponder keys (or transponder chips) are a crucial feature in most modern cars. The chips are incorporated into the fobs or keys' heads and include a unique immobilizer code. The antenna ring at top of the ignition transmits an alert to the transponder chip once the key is inserted and turned on. The chip then transmits an answer back to the antenna ring that matches the car's code. Transponder chips prevent theft since the keys must be properly inserted using the correct code to turn the car on. It's also more difficult to duplicate these keys, making it less likely that someone is able to take your car. A reputable locksmith can create transponder keys that can be programmed to your vehicle at a fraction the cost of what you'd spend at a dealership. They can also explain the type of key in your possession and how to program it. They might also be able to provide you the replacement key for your lost or stolen transponder key. They may also be able to help you reprogramme the chip if it has stopped working. Duplicate Keys The majority of people have lost keys at one point or another in their lives regardless of whether it was their keys to their car or house keys. It can be very frustrating to be locked out of your home or vehicle. To avoid this issue it's essential to have duplicate keys on hand. These duplicates can be used to open your lock and allow you to get inside if you're in a bind. The majority of duplicate keys are stamped or engraved with the “do not duplicate” message. This is a way to let others know that it's legal to copy the key unless the owner of it. These kinds of keys are often used for deadbolts, padlocks, and other door locks. They are also great for keeping the track of which key for a customer is which. Many people believe that the “do not duplicate” message on a key makes it more secure. However, this is not true. The message engraved on the key is only a warning and has no legal weight. However, it could hinder some people from attempting to have their key duplicated. Many chain hardware stores will refuse to cut these keys, however a locksmith can easily duplicate the keys. They can be cut on a blank that resembles as the original one to ensure accuracy. Battery Replacement If your Lexus key fob has stopped functioning, it's likely that it will need to be reprogrammed in order to work with the vehicle's immobilizer system. You'll need to go to the dealer or an experienced locksmith who can reprogram the ECU. Locksmiths typically cost more than the dealership, but you'll avoid the hassle of towing your car. Apart from the ECU the battery could require replacement too. You'll need to replace the old battery with a new one that matches the specifications of your vehicle. This includes the physical dimensions, terminal configuration and cold cranking amps (or amp-hour ratings). If you install an insufficient battery, it could cause serious damage to the engine and other components. Before you purchase a replacement battery, verify the warranty to determine whether it covers the cost. Also, you should consider whether you require an insurance policy in the event that the battery fails during the warranty's time. In addition, keep in mind that automotive locksmiths often don't carry the necessary tools to program keys, and you'll have to have a dealer or online key programmer come in and program the key for you. It's also essential to let them know the kind of key you had (chip smart fob, intelligent fob remote “push to start”), the year of your car, and the VIN number, if you can.