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How to Replace a Lexus Key Fob That Won't Turn On Or Work Correctly If you've got keys that don't function or turn on, it can be frustrating. There are some simple steps you can follow to resolve the problem. First take off the emergency metal keys from the key fob. Then make use of the flat end of the key made of metal to press and twist the cover open. Keyless Entry System The keyless entry system is a huge benefit for any car owner. They allow you to unlock your vehicle before you even touch a handle or exit the doorway for the passenger. Some even turn on the light when you get close. Others will open the trunk when you are carrying groceries or other electronic devices that are based on proximity. The key fob transmits a radio frequency signal the receiver inside the car and then sends a response code back to the vehicle. The signal only works when the key fob is within a specific range, which is typically 50 feet or less. Some of these systems are one-way, meaning the key fob is able to secure or unlock the vehicle, but it cannot start the engine. Regardless of the type of keyless entry system you select it is advised to have it installed by a professional. A reputable locksmith will make sure the connection is safe and complete, incorporating stripping a tiny portion of each wire before connecting it. The manual will show you which wires you need to use. A remote that is keyless can also lock the doors when you leave. This is a great feature if are not organized or tend to leave the car unlocked for too long. Transponder Keys Transponder keys, also known as transponder chips are an aplenty feature in modern vehicles. The chips are incorporated into the fobs' heads or the head of the keys and include a unique immobilizer code. When a key is fitted into the ignition lock cylinder and turned to ON it transmits a signal from the antenna ring on the top of your car's ignition to the transponder chip. The chip sends 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 must have the correct code to enable your car turn on. It's also more difficult to duplicate these keys, so it's less likely that someone is able to take your car. A locksmith who is reputable can make transponder keys that can be programmed to your vehicle at a fraction the cost of what you would spend at a dealership. They can also explain what type of key is in your possession and how to program it. They may also be able offer you an alternative for the transponder that was stolen or lost key. They can also help you with reprogramming the chip in case it has stopped working. Duplicate Keys Most people have lost keys at one point or another in their lives regardless of whether it was their car keys or house keys. It can be very frustrating to be locked out of your home or car. To avoid this, it's important to keep duplicate keys in your possession. These duplicates can be used to open your lock and help you get inside if you're in a pinch. Most duplicate keys are engraved or stamped with a “do not duplicate” message. This is to let others know that it is not legal to duplicate a key, unless the owner is. Keys are used to open padlocks and deadbolts, as well in other door locks. These keys are also great to keep an eye on which key of the customer is which. Many people believe that the “do not duplicate” message on the key makes it more secure. But this isn't the case. The message on these keys is an indication of caution and doesn't have any legal value. It could deter some individuals from attempting to duplicate their keys. Many chain hardware shops will not cut these keys. However locksmiths can easily duplicate them. They can be cut on a blank that resembles as the original one to ensure accuracy. Battery Replacement If your Lexus keyfob is not working it might need to be programmed in order that it is compatible with the immobilizer system in the vehicle. You'll need to contact a locksmith or visit your dealer to change the ECU. A locksmith is likely to charge more than a dealership, however they'll also avoid the hassle of having to tow your car there. In lost lexus keys to the ECU, your battery may need to be replaced as well. You'll need to replace your old battery with one that is compatible with the specifications of your car. This includes the physical dimensions, terminal configuration, and cold cranking amps (or amp-hour rating). If you install a defective battery it could cause significant damage to the engine as well as other components. Make sure to check the warranty prior to buy a new battery to see if the cost is covered. You might also want to think about whether you'll require warranty coverage if the battery fails within its warranty period. Also, be aware that automotive locksmiths aren't always equipped with the necessary tools to code keys, and you'll have to get a dealer or an online key programmer visit and program the key for you. It's also important to inform them know what kind of key (chip, intelligent, or remote “push-to-start”), the year that your car was and the VIN in the event that you can.