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How to Replace a Lexus Key Fob That Won't Turn On Or Work Correctly If you're stuck with a key fob that won't operate or turn on it can be a frustrating experience. Luckily, there are easy steps you can follow to fix the issue. First take off the emergency metal keys from the key fob. Use the flat end of a key made from metal to press the cover down and twist it open. Keyless Entry System The keyless entry system can be a great convenience for any car owner. You can lock your car before you touch the handle or get out of the door for passengers. Some of them even turn on the lights when you get close and open the trunk in case you've filled it with groceries, or turn on 10 other electronic devices based on your proximity. The key fob sends an radio-frequency signal to a receiver inside the car. This receiver then sends back a response code back to the vehicle. The signal is only effective when the keyfob is within a particular distance, which is typically 50 feet or less. Some of these systems are one-way, which means the key fob is able to lock or unlock the vehicle, but cannot start the engine. It is recommended that you have your keyless entry system professionally installed, regardless of the type. A good automotive locksmith will assure that the connection is completely and secure, even if that requires stripping a small part of each wire. The instruction manual will outline the exact wires to use and it is vital to only use the ones that are required. Another benefit of keyless remote entry is that it will also lock your doors automatically when you walk away from your car. This is helpful if aren't organized or have a tendency to leave your car locked for too long. Transponder Keys Transponder keys, also known as transponder chips are an aplenty feature in modern vehicles. These chips are embedded in the head of the key or fob and come with an unique immobilizer code. When the key is fitted into the ignition lock cylinder and then turned to ON it transmits a signal from the antenna ring located on the top of your car's ignition to your transponder chip. The chip sends an appropriate code-matching response to the antenna ring. The transponder chip discourages theft because keys must be placed correctly and have the right code to allow your car to turn on. It's also more difficult to make a duplicate of these keys, making it less likely that someone can steal your vehicle. A reputable locksmith will make transponder keys that are programed to match the car you own at just a fraction of the cost that you would pay at a dealership for cars. They can also assist you determine what kind of key you have and how to program it for your vehicle. They might even be able to give you a replacement key for your stolen or lost transponder. They may also assist you to with reprogramming the chip in case it has stopped functioning. Duplicate Keys No matter if they're your car keys or your house key, a majority of people have lost their keys at some point in their lives. It can be very frustrating to be locked out of your car or home. To avoid this problem, it's important to keep duplicate keys on hand. The duplicate keys will help you unlock your lock if you ever need to get stuck. replacement lexus key come with the “do duplicate” message that is stamped or engraved on the keys. This is to inform others know that it is not legal to duplicate a key unless they are the owner. These types of keys are commonly used for padlocks, deadbolts, and other door locks. They also provide a great way to keep track of which keys belong to the particular customer. Many people believe that the “do not duplicate” message on the key makes it more secure. But this isn't the case. The message on these keys is simply an indication of caution and doesn't carry any legal weight. It may discourage some people from attempting to duplicate their key. A majority of chain hardware stores refuse to cut these keys, but a locksmith can easily duplicate them. In fact, they could be cut on a similar blank to ensure that the duplicate is accurate. Battery Replacement If your Lexus keyfob isn't functioning it could need to be reprogrammed to ensure that it is compatible with the immobilizer system in the vehicle. You'll have to visit the dealer or a locksmith who's qualified to reprogram the ECU. Locksmiths typically cost more than the dealership, but you'll be able to avoid the headache of towing your vehicle. In addition to the ECU, it is possible that your battery needs to be replaced. You'll need to replace your old battery with one that meets the specifications of your vehicle. This includes the physical dimensions as well as the terminal configuration and amp-hours of cold cranking or rating. Incorrectly installed batteries can cause serious damage to your engine as well as other components. Before purchasing a replacement battery, make sure to check the warranty to see if it covers the cost. You'll also want to consider whether you need a warranty in case the battery fails during its coverage period. Additionally, you must be aware that automotive locksmiths typically don't have the necessary tools to code keys, so you'll have to find a dealer or a web-based key programmer come in and program the key for you. It's also essential to inform them know the type of key you want (chip intelligent, chip, or remote “push-to-start”) and the year your car was, and the VIN in the event that you can.