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How to Replace a Lexus Key Fob That Won't Turn On Or Work Correctly If you're stuck with keys that don't turn on or work correctly it can be a frustrating experience. There are some simple steps you can take to resolve the problem. First remove the metal emergency keys from the key fob. Use the flat edge of a key made of metal to press the cover and twist it open. Keyless Entry System Keyless entry systems provide a huge benefit for any car owner. They allow you to unlock your vehicle before you even touch the handle or walk out of the doorway for the passenger. Some of them will even turn on the lights as you approach. lexus keys will even open the trunk when you are carrying groceries or other electronic devices based on proximity. The key fob sends a radio frequency signal the receiver inside the car and it then transmits a response code back 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 manner meaning that the key fob is capable of locking or unlocking the vehicle, but not start the engine. It is recommended to have your keyless entry system professionally installed, regardless of the type. A professional locksmith in the automotive industry will make sure that the connection is safe and secure, even if it requires stripping a small part of each wire. The manual for the instructions will provide you with the exact wires to use, and it is important to use only the ones required. A remote with a keyless entry feature can also lock the doors when you leave. This is useful for those who forget and are prone to leaving their vehicle unlocked for too long. Transponder Keys Transponder keys (or transponder chips) are a vital feature of modern automobiles. They are embedded in the head of a fob or key and have a unique code that's linked to your car's immobilizer system. When the key is inserted into the ignition lock cylinder and turned to ON, a signal is sent from the antenna ring on the top of your car's ignition to the transponder chip. The chip transmits an appropriate code-matching response to the antenna ring. The transponder chip can deter theft because keys must be placed correctly and have the right code to allow your car to turn on. The keys are also much harder to duplicate, which makes it less likely that someone will steal your vehicle. A reputable locksmith can produce transponder keys that can be programmed to match your car at just a fraction of the cost you'd have to pay at a car dealership. They can also explain the type of key in your possession and how to program it. They may be able offer you a new key for your lost or theft transponder. They can also help reprogramme the chip if it is not functioning. Duplicate Keys If it's your car key or house key, most people have lost their keys at some point in their lives. It can be very frustrating to be locked out of your home or car. It is important to have two keys on hand to avoid this issue. These duplicates will help you unlock your lock if you ever find yourself stuck. Most duplicate keys come with the “do duplicate” message that is stamped or engraved on them. This is to signal that it is illegal to duplicate a key, unless the owner of the key is present. These keys are used for padlocks and deadbolts as for other door locks. These keys can also be a useful tool for keeping track of which key belonging to 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 engraved message on the keys is an indication of caution and doesn't have any legal weight. It could deter some individuals from trying to duplicate their key. Many chain hardware shops do not cut keys. However, a locksmith can easily duplicate them. They can be cut on a blank that looks as the original one to ensure accuracy. Battery Replacement If your Lexus key fob isn't functioning, it's likely to need to be reprogrammed to work with the vehicle's immobilizer. You'll have to visit the dealer, or a locksmith who's qualified to reprogram the ECU. Locksmiths typically charge more than the dealership, however you'll be able to avoid the headache of towing your vehicle. Apart from the ECU your battery may need to be replaced too. You'll have to replace the old battery with an alternative that is compatible with your car's specific specifications. This includes the physical dimensions, terminal configuration, and cold cranking amps (or amp-hour ratings). If you install the wrong battery, it could cause severe damage to your engine and other components. Before you purchase a replacement battery, make sure to look over the warranty to determine whether it covers the cost. You may also want to consider whether you'll need an insurance policy if the battery fails within the warranty period. In addition, keep in mind that car locksmiths usually don't have the tools needed to code keys, which is why you'll need to have a dealer or online key programmer to program the key for you. Also, it's important to let them know the type of key you had (chip or intelligent fob remote “push to start”), the year of your car, and the VIN number, if applicable.