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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 keypad won't function or it won't turn on. There are a few steps you can do to fix the issue. First remove the metal emergency keys from the key fob. Then you can use the flat end of the key's metal end to press and then twist the cover to open. Keyless Entry System The keyless entry system is a great convenience to any car owner. You can unlock your car when you even get out of the door for the passenger. Some of them will even turn on the light as you approach. Others will open the trunk when you're carrying groceries or 10 other electronic devices that are based on proximity. The key fob transmits the radio frequency signal to the car's receiver and it then transmits an answer code back to the vehicle. The signal is only valid if the key fob is within a certain area, usually 50 feet or less. Some of these systems are one-way, meaning the key fob can be used to lock or unlock the vehicle, but it cannot start the engine. Whatever keyless entry system you pick It is recommended to have it installed by a professional. A reliable locksmith in the automotive sector will make sure that the connection is complete and secure, even if that requires stripping a small part of each wire. The manual will tell you which wires to use. A remote that is keyless can also secure the doors when you walk away. This is helpful if you are prone to forgetfulness or have a tendency to leave your car unlocked for too long. Transponder Keys Transponder keys (or transponder chips) are a vital feature of modern automobiles. These chips are embedded in the fobs' heads or the head of the keys and have an unique immobilizer code. The antenna ring on the top of the ignition transmits a signal to the transponder chips when the key is inserted and switched ON. The chip then transmits a response back to the antenna ring that matches your car's code. The transponder chip is a deterrent to theft since the keys must be put in correctly and must have the correct code for your car to turn on. It's also harder to make a duplicate of these keys, making it less likely that someone could steal your car. A reputable locksmith can make transponder keys that can be programmed for your vehicle at a fraction of what you'd pay at an auto dealership. They can also explain 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 theft transponder. They may also be able to assist to reprogramme the chip if it's stopped working. Duplicate Keys Many people have lost keys at least once in their lives whether it was car keys or their home keys. It's frustrating to be locked out of your home or car. To avoid this situation it's crucial to keep duplicate keys on hand. These duplicates will help you open your lock if you ever find yourself stuck. Most duplicate keys have an “do duplicate” message stamped or engraved on the keys. This is to let others know that it is not legal to duplicate a key without the permission of the owner. Keys are used for padlocks and deadbolts as with other door locks. They are also an excellent tool for keeping the track of which key for a customer is which. Many people think that the “do duplicate” message on the keyboard can make it more secure. However, this is not the case. The message that is engraved on these keys is merely an indication and does not carry any legal weight. It might deter some people from attempting to duplicate their key. A majority of chain hardware stores will not cut these keys. However locksmiths can easily replicate them. In fact, they can be cut on a similar blank to ensure that the duplicate is accurate. Battery Replacement If your Lexus key fob isn't working, it will probably need to be reprogrammed in order to work with the immobilizer system of your vehicle. You will need to contact a locksmith or your dealer to reprogram the ECU. A locksmith is likely to cost more than a dealership, however they'll save you the burden of having to tow your vehicle there. In addition to the ECU, it is possible that your battery will also need to be changed. It is necessary to replace your old battery with one that matches the specifications of your car. This includes the physical size as well as the terminal configuration and amp-hour or cold cranking amps rating. If you install an insufficient battery it could cause serious damage to the engine and other components. Before purchasing a replacement battery, make sure to examine the warranty to determine whether it covers the cost. replacement lexus keys should also consider whether you need an assurance in case the battery fails within its coverage period. Also, keep in mind that car locksmiths usually don't have the necessary tools to code keys, and you'll have to either have a dealer or online key programmer come in and program the key for you. It's also important to tell them know what kind of key you want (chip smart, intelligent, or remote “push-to-start”) as well as the year your car was, and the VIN If you have it.