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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 a few steps you can use to fix the issue. The first step is to take the emergency key made of metal from the key fob. Make use of the flat end of a key in metal to press the cover, then make it open. Keyless Entry System Keyless entry systems are a wonderful convenience for anyone who drives. You can unlock your car when you touch the handle or walk out of the door for the passenger. Some of them will even turn on the light as you approach. Some will even open the trunk when you are carrying groceries, or any other electronic devices that are based on proximity. lexus car key transmits an audio frequency signal to the receiver inside the car which then transmits an answer code back to the vehicle. The signal will only be valid when the key fob is in a certain distance, typically 50 feet or less. Some of these systems are single-way, meaning the key fob will lock or unlock the vehicle, but it cannot start the engine. Regardless of the type of keyless entry system you select, it is recommended to have it professionally installed. 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 remote that is keyless can also lock the doors after you leave. This is helpful if are forgetful or have a tendency to leave the car locked for too long. Transponder Keys Transponder keys (or transponder chips) are an important feature in most modern cars. The chips are incorporated into the fobs or keys' heads and include an immobilizer number that is unique to each. When the key is placed into the ignition lock cylinder and then turned to ON, a signal is sent from the antenna ring located on the top of your vehicle's ignition to your transponder chip. The chip sends an algorithm for code-matching to the antenna ring. Transponder chips discourage theft, because the key must be inserted correctly with the correct code to turn your car on. The keys are also much harder to duplicate, making it less likely for someone to steal your vehicle. A reputable locksmith can make transponder keys that can be programed to match the car you own at only a fraction of the price that you would have to pay at a car dealership. They can also assist you to identify the type of key you have and how to program it for your vehicle. They might also be able to provide you a replacement for your lost or stolen transponder key. They may also assist you to 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 their house keys. If this occurs, it's difficult and frustrating to find yourself locked out of your home or vehicle. It's important to have duplicate keys to avoid this issue. These duplicate keys can be used to unlock your lock and allow you to get inside in the event that you're stuck. The majority of duplicate keys have a “do duplicate” message stamped or engraved on them. This is to inform others that it is illegal to copy a key without the permission of the owner. Keys are used for deadbolts and padlocks as well in other door locks. These keys are also a great tool for keeping track of which key belonging to a customer is which. Many people think that the “do duplicate” message on the keyboard can make it more secure. This is not the case. The engraved message on these keys is an indication of caution and doesn't have any legal value. It might deter some people from trying to duplicate their keys. Some chain hardware stores not cut keys, however locksmiths are able to duplicate the keys. In fact, they can even be cut on a similar blank to ensure that the duplicate is authentic. Battery Replacement If your Lexus key fob isn't working, it will probably require reprogramming to work with the vehicle's immobilizer system. You'll need to contact an expert locksmith or go to your dealer to reprogram the ECU. Locksmiths usually charge more than the dealership, however you'll be able to avoid the headache of towing your vehicle. In addition to the ECU your battery may require replacement too. You'll need to replace the old battery with one that matches the specifications of your car. This includes the physical size, terminal configuration, and cold cranking amps or amp-hour rating. If you install an incorrect battery it could cause severe damage to the engine as well as other components. Before purchasing a replacement battery, look over the warranty to determine if it covers the cost. You may also want consider whether you'll need an assurance in the event that the battery fails within its warranty. Additionally, you must keep in mind that automotive locksmiths usually don't have the necessary tools to program keys, so you'll need to find a dealer or online key programmer come and program the key for you. It is also important to let them know the kind of key you used (chip smart fob, intelligent fob remote “push to start”), the year of your car, and the VIN number if possible.