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How to Replace a Lexus Key Fob That Won't Turn On Or Work Correctly It can be a hassle when your key fob will not work or turn on. Luckily, there are easy steps you can follow to fix the issue. First remove the emergency keys from the key fob. Then utilize the flat side of the metal key to press and then twist the cover to open. Keyless Entry System Keyless entry systems are a wonderful option for anyone who owns a car. They allow you to unlock your vehicle before you even touch a handle or walk out of the doorway for the passenger. Some of them even turn on the lights as you approach, open the trunk if it's filled with groceries, or activate 10 other electronic gadgets depending on the proximity of your vehicle. The key fob sends the radio frequency signal to the receiver inside the car, which in turn sends an answer code back to the vehicle. The signal only works only if the keyfob falls within a particular range, which is usually 50 feet or less. lexus car keys replacement of these systems function in a one-way manner this means that the key fob will only be able to lock or unlock the car, but not start the engine. Whatever keyless entry system you select it is recommended to have it installed by a professional. A reputable locksmith will make sure the connection is safe and complete, incorporating stripping a small portion of each wire before connecting it. The manual for the instructions will provide you with the exact wires to use and it is essential to use only the ones required. A remote that is keyless can also lock the doors after you leave. This is a great feature if are prone to forgetfulness or tend to leave the car locked for too long. Transponder Keys Transponder keys or transponder chips are a common feature in modern cars. These chips are integrated into the head of a fob or key and contain a unique code that's linked to your car's immobilizer system. When the key is placed into the ignition lock cylinder, and then turned to ON the signal is transmitted from the antenna ring on the top of your vehicle's ignition to the transponder chip. The chip then sends a response back to the antenna ring that matches your car's code. Transponder chips deter theft, because the keys must be correctly inserted with the right code to turn your car on. It's also more difficult to make a duplicate of these keys, making it less likely that someone can take your car. A reputable locksmith can produce transponder keys that are programed to match the car you own at less than the price that you pay at a dealership for cars. They can also help determine what kind of key you have and how to program it to match your car. They may also be able offer you a replacement for your lost or stolen transponder key. They can also help in reprogramming the chip if it has stopped functioning. Duplicate Keys Many people have lost keys at one point or another in their lives whether it was car keys or house keys. If this happens, it can be painful and uncomfortable to find yourself locked out of your home or car. To avoid this issue, it's important to keep duplicate keys in your possession. These duplicate keys are able to be used to open your lock and help get inside if you're ever stuck. Most duplicate keys are stamped or engraved with a “do not duplicate” message. This is a way to let others know that it's legal to copy the key unless the owner of it. Keys are used for deadbolts and padlocks as well in other door locks. They are also an excellent method of keeping an eye on which key belongs to the particular customer. Many people think that the “do duplicate” message on a keyboard can make it more secure. However, this is not the case. The engraved message on the keys is a warning and does not have any legal significance. However, it might hinder some people from attempting to have their key duplicated. Most chain hardware stores will not cut these keys. However, a locksmith can easily replicate them. In fact, they can be cut on a lookalike blank to ensure that the duplicate is authentic. Battery Replacement If your Lexus key fob has stopped working, it will probably have to be programmed to work with the vehicle's immobilizer. You'll need to visit the dealer, or a locksmith who is qualified to reprogram the ECU. Locksmiths typically cost more than the dealership, however you'll be able to avoid the headache of towing your vehicle. In addition to the ECU there is a chance that your battery needs to be replaced. You'll need to replace your old battery with one that meets the specifications of your car. This includes the physical dimensions, terminal configuration, as well as cold cranking amps (or amp-hour ratings). If you install a defective battery it could cause serious damage to the engine and other components. Examine the warranty prior purchase a new battery to determine if the price is covered. You may also want consider whether you'll need an insurance policy if the battery fails within its warranty period. In addition, you should keep in mind that car locksmiths aren't always equipped with the necessary tools to code keys, which is why you'll need to find a dealer or an online key programmer visit and program the key for you. It's also important to let them know the type of key you want (chip intelligent, chip, or remote “push-to-start”), the year your car was and the VIN in the event that you can.