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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 doesn't function or it won't turn on. There are a few steps you can follow to fix the issue. First remove the emergency keys from the key fob. Then utilize the flat side of the key's metal end 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 allow you to unlock your vehicle before you even touch a lever or walk out of the doorway for the passenger. 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 in the car. The receiver will then send back an appropriate response code to the vehicle. The signal only works only if the keyfob falls within a specified range, which is typically 50 feet or less. Some of these systems are one-way, which means the key fob is able to lock or unlock the vehicle, but it cannot start the engine. Regardless of the type of keyless entry system that you choose it is advised to have it installed by a professional. A professional locksmith in the automotive industry will ensure that the connection is safe and complete, which includes stripping a small portion of each wire to connect it. The instructions manual will outline the exact wires to use and it is crucial that you only use ones required. Another benefit of keyless remote access is that it can also lock your doors automatically when you walk away from the car. This is useful if you are not organized or have a tendency to leave the car unlocked for too long. Transponder Keys Transponder keys, also known as transponder chips are a standard feature in modern cars. These chips are placed in the head of the key or fob and come with a unique immobilizer code. The antenna ring at the top of the ignition transmits an alert to the transponder chip once the key is inserted and turned ON. The chip transmits an appropriate code-matching response to the antenna ring. Transponder chips deter theft, because the keys must be correctly inserted with the proper code to turn your car on. It's also harder to make a duplicate of the keys, making it less likely that someone could steal your vehicle. A reputable locksmith can create transponder key copies that are programed to match the car you own at less than the price that you have to pay at a car dealership. They can also assist you to identify the type of key you own and how to program it for your car. They may be able offer you a replacement key for your stolen or lost transponder. They can also help you with reprogramming the chip in case it has stopped functioning. Duplicate keys The majority of people have lost keys at one point or another in their lives, whether it was their keys to their car or house keys. key for lexus can be frustrating to be locked out of your car or home. To avoid this it is essential to keep duplicate keys on hand. These duplicates will help you open your lock should you ever get stuck. The majority of duplicate keys have an “do duplicate” message stamped or engraved on them. This is a way to let others know that it's legal to duplicate the key unless the owner of the key. Keys like this are commonly used for padlocks, deadbolts or other door locks. These keys can also be a useful tool to keep track of which customer's key is which. Many people believe that the “do duplicate” message on a keyboard makes it more secure. This isn't the case. The message engraved on the keys is a warning and does not carry any legal weight. However, it might hinder some people from attempting to have their key duplicated. A majority of chain hardware stores do not cut keys. However locksmiths are able to duplicate the keys. In fact, they could be cut using a replica blank to ensure that the duplicate is correct. Battery Replacement If your Lexus keyfob isn't working it might need to be reprogrammed to ensure that it can work with the immobilizer system of the vehicle. You will need to contact a locksmith or visit your dealer to change the ECU. A locksmith is likely to cost more than a dealership, but they'll also save you the burden of having to tow your vehicle there. Apart from the ECU, your battery may require replacement also. You'll need to replace the old battery with one that's compatible with the specifications of your vehicle. This includes the physical dimensions, terminal configuration, as well as cold cranking amps or amp-hour rating. If you install an insufficient battery it could cause serious damage to the engine as well as other components. Before purchasing a replacement battery, make sure to verify the warranty to determine if it covers the cost. It is also important to determine whether you require a warranty in the event that the battery fails during its warranty time. Additionally, you must keep in mind that automotive locksmiths typically don't have the necessary tools to code keys, so you'll have to get a dealer or online key programmer visit and program the key for you. It's also important to tell them what type of key you want (chip intelligent, chip, or remote “push-to-start”) and the year of your car and the VIN if you can.