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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 turn on or work correctly It can be frustrating. There are some simple steps you can follow to resolve the issue. The first step is to remove the metal emergency key from the key fob. Use the flat end of a key made of metal to press the cover, then turn it to open. Keyless Entry System Keyless entry systems are a great benefit for any car owner. They let you unlock your vehicle before you even touch a handle or step out of the passenger door. Some of them even turn on the lights when you get close, open the trunk when you've loaded it with groceries, or activate 10 other electronic gadgets in response to your proximity. The key fob transmits a radio frequency signal the car's receiver and it then transmits a response code back to the vehicle. The signal is valid only if the key fob is in a certain range, usually about 50 feet or less. Some of these systems are one-way, which means the key fob is able to be used to lock or unlock the vehicle, but it cannot start the engine. It is recommended that you have your keyless entry system installed by a professional, regardless of the type. A reputable locksmith for cars will make sure the connection is safe and complete, incorporating stripping a small portion of each wire to connect it. The manual will inform you which wires to use. Keyless remote entry can also lock the doors if you leave. This is useful for those who forget and tend to leave their car unlocked long enough. Transponder Keys Transponder keys (or transponder chips) are an important feature in most modern cars. These chips are placed in the head of the key or fob and contain an immobilizer code that is unique to. The antenna ring at the top of the ignition sends a signal to the transponder chip once the key is inserted, and then turned on. The chip sends an appropriate code-matching response to the antenna ring. Transponder chips are a deterrent to theft, because the keys must be correctly inserted with the right code to turn your car on. replacement lexus keys are also more difficult to duplicate, which makes it less likely that someone will steal your vehicle. A reputable locksmith will make transponder keys that are programmed to match your vehicle at less than the price that you pay at a dealership for cars. They can also assist you understand what type of key you own and how to program it for your vehicle. They may even be able to give you an alternative to your lost or stolen transponder key. They can also help you reprogramme your chip if it's stopped functioning. Duplicate Keys The majority of people have lost keys at least once in their lives regardless of whether it was their car keys or house keys. When this occurs, it's difficult and frustrating to be locked out of your home or car. To avoid this problem, it's important to keep duplicate keys in your possession. These duplicates will help you open your lock should you ever get stuck. Most duplicate keys are engraved or stamped with the “do not duplicate” message. This is a way to let the public that it is not legal to duplicate keys unless you're the owner of it. These kinds of keys are commonly used for padlocks, deadbolts, and other door locks. These keys are also a great tool for keeping track of which customer's key is which. Many people believe that the “do not duplicate” message on the key makes it more secure. However, this is not the case. The message engraved on the key is a warning only and does not carry any legal weight. However, it could hinder some people from attempting to duplicate their keys. Many chain hardware shops will not cut these keys. However locksmiths can easily replicate them. In fact, they can even be cut with a lookalike blank to ensure that the duplicate is accurate. Battery Replacement If your Lexus key fob has stopped working, it's likely need to be reprogrammed in order to work with the vehicle's immobilizer system. You'll have to go to the dealer or a locksmith who's qualified to reprogram the ECU. Locksmiths usually charge more than the dealership, but you'll be able to avoid the headache of towing your vehicle. In addition to the ECU your battery may require replacement also. You'll have to replace your old battery with one that is compatible with the specifications of your vehicle. This includes the physical dimensions, terminal configuration, and amp-hour rating or cold cranking rating. If you install an incorrect battery it could cause severe damage to the engine and other components. Before you purchase a replacement battery, make sure to verify the warranty to determine if it covers the cost. You might also want to think about whether you'll need a warranty if the battery fails within its warranty period. Also, keep in mind that many automotive locksmiths do not have tools required to code keys. Therefore, you'll need to hire a dealer to program your key or make use of an online key programmer. It's also essential to inform them know what kind of key (chip smart, intelligent, or remote “push-to-start”) and the year of your car, and the VIN should you be able to.