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How to Replace a Lexus Key Fob That Won't Turn On Or Work Correctly When you have a key fob that won't start or function properly it can be very frustrating. There are a few steps you can take to fix the problem. First remove the metal emergency keys from the key fob. Then, use the flat end of the key to press and then twist the cover to open. Keyless Entry System The keyless entry system is a great convenience for any car owner. You can lock your car before you touch the handle or walk out of the door of the passenger. Some of them will even turn on the light when you get close. Others will open the trunk when you're carrying groceries or 10 other electronic devices based on proximity. The key fob transmits a radio frequency signal the receiver inside the car which then transmits an answer code back to the vehicle. The signal is only valid if the key fob is within a specified range, typically 50 feet or less. Some of these systems are one-way. This means that the key fob can lock or unlock the vehicle, but it can't start the engine. It is recommended that you have your keyless entry system professionally installed, regardless of the type. A good automotive locksmith will make sure the connection is safe and complete, incorporating stripping a tiny portion of each wire before connecting it. The manual will explain which wires you need to use. A keyless remote entry can also lock the doors when you leave. This is helpful if you are forgetful or have a tendency to leave your car unlocked for too long. Transponder Keys Transponder keys or transponder chips are a common feature in modern automobiles. These chips are placed in the fobs' heads or the head of the keys and include an immobilizer number that is unique to each. When the key is put into the ignition lock cylinder and then turned to ON the signal is transmitted from the antenna ring that is located on the top of your vehicle's ignition to your transponder chip. The chip then transmits a response back to the antenna ring that is in line with your vehicle's code. Transponder chips deter theft, as the key must be correctly inserted with the right code to turn your car on. The keys are also much harder to duplicate, which makes it less likely that someone will take your car. A reliable locksmith can create transponder keys that can be programmed for your vehicle at a fraction of what you would pay at a car dealership. They can also help you understand the type of key in your possession and how to program it. They might even be able to give you a new key to replace your stolen or lost transponder. They can also help in reprogramming the chip if it has stopped functioning. Duplicate Keys Most people have lost keys at some point in their lives regardless of whether it was their keys to their car or house keys. If this happens, it can be uncomfortable and frustrating to be locked out of your home or car. To avoid this problem it is essential to keep duplicate keys in your possession. These duplicates will help you unlock your lock in the event that you ever need to get stuck. Most duplicate keys feature the “do duplicate” message that is stamped or engraved on the keys. This is to inform others know that it is unlawful to duplicate keys without the permission of the owner. These keys are utilized for padlocks and deadbolts, as well in other door locks. They are also great to keep track of which key belonging to a customer is which. Many people believe that the “do duplicate” message on a keyboard is a way to make it more secure. However, this is not true. The message engraved on these keys is simply an indication and does not have any legal value. It could discourage some from trying to duplicate their keys. Some chain hardware stores not cut these keys, but a locksmith can easily duplicate them. In fact, they can be cut using a replica blank to ensure that the duplicate is authentic. Battery Replacement If your Lexus key fob isn't functioning, it's likely to have to be programmed to work with the immobilizer system of your vehicle. You'll need to visit the dealer, or a locksmith who is qualified to reprogram the ECU. Typically, a locksmith will cost more than a dealership, but they'll save you the hassle of having to tow your vehicle there. In addition to the ECU the battery could need to be replaced too. The Key Lab 'll need to replace the old battery with one that's compatible with the specifications of your car. This includes the physical dimensions, terminal configuration and cold cranking amps (or amp-hour rating). Incorrectly installed batteries can cause serious damage to your engine and other components. Before purchasing a replacement battery, check the warranty to see whether it covers the cost. Also, you should consider whether you require an assurance in case the battery fails within its warranty time. Keep in mind that a lot of automotive locksmiths do not have the tools required to program keys. Therefore, you will require a professional to program your key or make use of an online key programmer. It's also essential to inform them about the kind of key you had (chip or intelligent fob, remote “push to start”), the year of your vehicle, and the VIN number, if applicable.