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How to Replace a Lexus Key Fob That Won't Turn On Or Work Correctly When you have keys that don't start or function properly it can be very frustrating. There are a few steps you can take to fix the problem. First take off the emergency metal keys from the key fob. Make use of the flat end of a metal key to press the cover down and make it open. Keyless Entry System The keyless entry system is a huge convenience to any car owner. You can lock your car before you even get out of the door for passengers. Some even turn on the lights as you approach or open the trunk, if you have it loaded with groceries, or activate 10 other electronic devices based on your proximity. The key fob transmits radio-frequency signals to the receiver in the car. The receiver will then send back a response code to the vehicle. The signal is only valid when the key fob is within a specified area, usually 50 feet or less. Some of these systems are one-way, which means the key fob can only be used to lock or unlock the vehicle, but cannot start the engine. Regardless of the type of keyless entry system you choose, it is recommended to have it professionally installed. A reputable locksmith for cars can assure that the connection is complete and secure, even if that requires stripping a small part of each wire. The manual will tell you which wires to use. Keyless remote entry can also lock the doors if you walk away. This is useful if you are not organized or tend to leave the car unlocked for too long. Transponder Keys Transponder keys (or transponder chips) are a vital feature of modern automobiles. The chips are incorporated into the fobs' heads or the head of the keys and come with an immobilizer code that is unique to. The antenna ring at top of the ignition transmits an alert to the transponder chip once the key is inserted and switched ON. The chip transmits an encoding response to the antenna ring. The use of a transponder chip deters theft because keys must be placed correctly and must have the correct code to allow your car to turn on. replacement lexus key fob cost 's also more difficult to make a duplicate of these keys, so it's less likely that someone is able to take your vehicle. A reputable locksmith can make transponder keys that can be programmed for your vehicle at a fraction of what you would pay at a car dealership. They can also help understand what type of key you own and how to program it to your car. They may even be able to give you an alternative to your lost or stolen transponder key. They may also be able to help you reset 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 home keys. If this happens, it can be frustrating and inconvenient to find yourself locked out of your home or car. To avoid this situation it's crucial to keep duplicate keys on hand. These duplicate keys can be used to unlock your lock and assist you to get inside if you're in a pinch. Most duplicate keys are engraved or stamped with a “do not duplicate” message. This is to inform others know that it is unlawful to duplicate keys unless the owner is. These keys are utilized for deadbolts and padlocks as well for other door locks. They are also a great tool to keep an eye on which key of the customer is which. Many people believe that the “do not duplicate” message on the key makes it more secure. However, this isn't the case. The engraved message on these keys is simply a warning and does not have any legal significance. However, it might deter some people from attempting to duplicate their key. Many chain hardware stores will refuse to cut the keys, however locksmiths can easily duplicate them. In fact, they can even be cut using a replica blank to ensure that the duplicate is accurate. Battery Replacement If your Lexus key fob isn't working, it's likely require reprogramming to work with the immobilizer system of your vehicle. You'll need to call a locksmith or your dealer to change the ECU. In general, locksmiths will cost more than a dealership, however they'll also save you the hassle of having to tow your vehicle there. Aside 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 the specifications of your car. This includes the physical size, terminal configuration, and amp-hour rating or cold cranking rating. If you install an incorrect battery it could cause serious damage to the engine as well as other components. Before you purchase a replacement battery, check the warranty to see if it covers the cost. You may also want to consider whether you'll need warranty coverage if the battery fails within its warranty period. Keep in mind that many automotive locksmiths do not have the tools necessary to code keys. Therefore, you'll need to hire a dealer to program your key or use an online key programmer. It's also important to tell them know the type of key (chip smart, intelligent, or remote “push-to-start”) and the year your car was and the VIN If you have it.