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How to Replace a Lexus Key Fob That Won't Turn On Or Work Correctly If you have an electronic key fob that doesn't start or function properly it can be a frustrating experience. Fortunately, there are a few steps you can do to fix the issue. The first step is to take the emergency key made of steel from the key fob. Use the flat edge of a metal key to press the cover, then twist it open. Keyless Entry System Keyless entry systems are a wonderful option for anyone who owns a car. They allow you to unlock your car before you even touch a lever or step out of the passenger door. Some of them even turn on the lights when you get close and open the trunk if it's filled with groceries, or turn on 10 other electronic accessories in response to your proximity. The key fob transmits radio-frequency signals to the receiver in the car. The receiver sends back a response code to the vehicle. The signal will only be valid when the key fob is within a specific range, usually about 50 feet or less. Some of these systems work in a one-way way meaning that the key fob is able to lock or unlock the car, but it is not able to 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 good automotive locksmith will ensure that the connection is safe and complete, which includes stripping a small part of each wire to connect it. The manual for the instructions will show you the specific wires to use and it is vital to only use the ones required. Keyless remote entry can also lock the doors if you leave. This is useful if you are forgetful or have a tendency to leave your car locked for too long. Transponder Keys Transponder keys (or transponder chips) are an important feature in modern vehicles. They are embedded into the head of the key or fob and come with an immobilizer number that is unique to each. The antenna ring located at the top of the ignition transmits an alert 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. The transponder chip can deter theft because the key must be inserted correctly and have the right code for your car to turn on. These keys are also difficult to duplicate, which makes it less likely that someone will take your car. A reliable locksmith can create transponder keys which are programmed for your car at a fraction the cost of what you'd pay at a car dealership. They can also explain the type of key in your possession and how to program it. They might even be able to give you an alternative to your stolen or lost transponder key. They can also help reprogramme the chip if it is not working. Duplicate keys Many people have lost keys at least once in their lives, whether it was their car keys or house keys. It can be a hassle to be locked out of your house or car. To avoid this problem it's essential to have duplicate keys on hand. These duplicate keys can be used to open your lock and assist you to get inside in the event that you're in a bind. Most duplicate keys come with an “do duplicate” message that is stamped or engraved on the keys. This is a way of letting others know that it's legal to copy the key unless you are the owner of it. Keys are used for padlocks and deadbolts as with other door locks. These keys are also a great tool to keep the track of which key for a customer is which. Many people believe that the “do not duplicate” message on keys makes them more secure. However, this is not true. The message engraved on the key is a warning only and is not legally binding. It could discourage some from trying to duplicate their key. A majority of chain hardware stores refuse to cut these keys, but locksmiths can easily duplicate the keys. They can be cut on a blank that resembles like the original to ensure precision. Battery Replacement If your Lexus keyfob isn't working it may need be reprogrammed in order that it is compatible 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, however they'll also save you the hassle of towing your car there. In addition to the ECU and the battery, it could need to be replaced also. You'll have to replace your old battery with one that meets the specifications of your vehicle. This includes the physical size, terminal configuration, and amp-hour or cold cranking amps rating. If you install the wrong battery it could cause significant damage to the engine and other components. If replacement lexus key are considering purchasing a replacement battery, be sure to check the warranty to see whether it covers the cost. You may also want to think about whether you'll require a warranty if the battery fails during its warranty period. You should also keep in mind that many automotive locksmiths do not have the tools necessary to code keys. Therefore, you'll require a professional to program your key or employ an online key programming tool. It's also essential to inform them what type of key (chip or intelligent, or remote “push-to-start”) as well as the year that your car was, and the VIN should you be able to.