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How to Replace a Lexus Key Fob That Won't Turn On Or Work Correctly It can be quite frustrating when your key fob won't work or it won't turn on. Luckily, there are easy steps you can do to fix the issue. First remove the emergency keys from the key fob. Utilize the flat side of a metal key to press the cover, then make it open. Keyless Entry System The keyless entry system is a wonderful convenience for any car owner. They allow you to unlock your car before you even touch the handle or step out of the doorway for the passenger. Some of them even turn on the lights when you approach or open the trunk, if you have it loaded with groceries, or turn on 10 other electronic gadgets dependent on your proximity. The key fob sends a radio frequency signal to the receiver inside the car which then transmits a response code back to the vehicle. The signal is only valid if the key fob is in a certain area, usually 50 feet or less. Some of these systems work in a single-way mode meaning that the key fob is only able to lock or unlock the vehicle, but not start the engine. No matter what type of keyless entry system you pick it is advised to have it professionally installed. A reliable locksmith in the automotive sector will make sure 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 you need. Another benefit of remotes with keyless entry is that it will also lock your doors automatically when you walk away from the vehicle. This is useful for those who are forgetful and often leave their vehicle unlocked for too long. Transponder Keys Transponder keys or transponder chips are an aplenty feature in modern cars. These chips are built into the head of a key or fob and contain a unique code which is linked to the car's immobilizer system. The antenna ring at the top of the ignition sends an alert to the transponder chips when the key is inserted and switched ON. The chip transmits an algorithm for code-matching to the antenna ring. The use of a transponder chip can deter theft because the keys must be put in correctly and contain the correct code to enable your car turn on. These keys are also difficult to duplicate, which makes it less likely that someone will take your car. A reputable locksmith can create transponder keys that can be programmed to match your car at a fraction of the cost that you would spend at a car dealer. They can also assist you identify the type of key you have and how to program it for your car. They might even be able to give you a new key for your stolen or lost transponder. They may also be able to assist you reprogramme your chip if it's stopped working. Duplicate Keys A majority of people have lost their keys at some point in their lives whether it was car keys or their home keys. When this happens, it can be difficult and frustrating to be locked out of your car or home. It is essential to have duplicate keys in order to avoid this problem. The duplicate keys will help you open your lock should you ever get stuck. The majority of duplicate keys are engraved or stamped with a “do not duplicate” message. This is to let others that it is illegal to copy a key without the permission of the owner. Keys of this kind are commonly used for padlocks, deadbolts, and other door locks. They can also be a useful tool to keep an eye on which key of the customer is which. Many people believe that the “do duplicate” message on a keyboard makes it more secure. But this isn't true. The message engraved on the key is merely a warning and is not legally binding. It might deter some people from trying to duplicate their keys. Many chain hardware stores will not cut these keys, however locksmiths are able to duplicate the keys. In fact, they could be cut with a lookalike blank to ensure that the duplicate is correct. Battery Replacement If your Lexus keyfob doesn't work it may need be reprogrammed to ensure that it is compatible with the immobilizer system in the vehicle. It is necessary to contact an expert locksmith or go to your dealer to modify the ECU. Most locksmiths cost more than a dealership, however they'll also spare you the burden of having to tow your vehicle there. In addition to the ECU It is also possible that your battery will need to be replaced. You'll have 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 cold cranking amps or amp-hour rating. The wrong battery installation can cause severe damage to your engine and other components. Make sure to check the warranty prior to buy a new battery to see if the cost is covered. You may also want to consider whether you'll need warranty coverage if the battery fails during its warranty period. In addition, you should keep in mind that automotive locksmiths often don't carry the tools needed to code keys, so you'll have to have a dealer or a web-based key programmer to program the key for you. G28 Car Keys 's also important to let them what type of key you want (chip smart, intelligent remote, or “push-to-start”) and the year that your car was and the VIN in the event that you can.