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How to Replace a Lexus Key Fob That Won't Turn On Or Work Correctly It can be frustrating when your keypad won't function or switch off. There are simple steps you can take to resolve the issue. First remove the emergency keys from the key fob. Then you can use the flat end of the metal key to press and twist the cover open. Keyless Entry System The keyless entry system is a wonderful convenience to any car owner. They allow you to unlock your car before you even touch a lever or exit the passenger door. Some even turn on the light as you approach. Some will even open the trunk when carrying groceries or 10 other electronic devices that are based on proximity. 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. G28 is only effective when the key fob is within a certain area, usually 50 feet or less. Some of these systems function in a one-way way, which means that the key fob is capable of locking or unlocking the car, but not start the engine. It is recommended that you have your keyless entry system installed by a professional, regardless of the type. A reputable locksmith for cars will make sure that the connection is safe and secure, even if that requires stripping a tiny portion of each wire. The manual will explain which wires you need to use. Another benefit of keyless remote entry is that it can also lock your doors automatically when you walk away from the vehicle. This is helpful if you are not organized or tend to leave your car unlocked for too long. Transponder Keys Transponder keys, also known as transponder chips are a standard feature in modern vehicles. The chips are incorporated into the head of a key or fob and contain a unique number that is linked to your vehicle's immobilizer system. When the key is fitted into the ignition lock cylinder, and then turned to ON and a signal is sent from the antenna ring that is located on the top of your vehicle's ignition to the transponder chip. The chip transmits an answer back to the antenna ring that matches your car's code. The transponder chip discourages theft because keys must be placed correctly and must have the correct code to allow your car to turn on. They are also more difficult to duplicate, making it less likely that someone will take your car. A reputable locksmith will make transponder keys that can be programmed to match your car at a fraction of the cost you'd have to pay at a car dealership. They can also help identify the type of key you own and how to program it to your car. They may be able offer you a new key to replace your stolen or lost transponder. They can also help you in reprogramming the chip if it is not functioning. Duplicate Keys No matter if they're your car keys or house keys, the majority people have lost their keys at some time in their lives. It can be very frustrating to be locked out of your home or car. To avoid this problem it's crucial to keep duplicate keys on hand. These duplicates can help you unlock your lock if you ever get stuck. Most duplicate keys come with an “do duplicate” message that is stamped or engraved on the keys. This is a way to alert others that it is illegal to duplicate a key unless they are the owner. Keys are used for padlocks and deadbolts as in other door locks. They also provide an excellent way to keep track of which keys belong to which customer. Many people believe that the “do not duplicate” message on keys makes them more secure. However, this is not the case. The engraved message is a warning only and is not legally binding. It could deter some individuals from trying to duplicate their key. A majority of chain hardware stores refuse to cut the keys, however locksmiths can easily duplicate them. In fact, they can be cut using a replica blank to ensure that the duplicate is correct. Battery Replacement If your Lexus key fob has stopped functioning, it's likely that it will need to be reprogrammed in order to work with the vehicle's immobilizer. You'll have to go to the dealer or a locksmith who is qualified to reprogram the ECU. A locksmith will usually charge more than the dealership, but you'll be able to avoid the headache of towing your vehicle. Apart from the ECU and the battery, it could require replacement too. You'll have to replace your old battery with one that meets the specifications of your car. This includes the physical dimensions, terminal configuration, and amp-hours of cold cranking or rating. If you install an incorrect battery it could cause serious damage to the engine and other components. Before purchasing a replacement battery, be sure to check the warranty to see whether it covers the cost. You should also consider whether you require a warranty in the event that the battery fails during its coverage period. Keep in mind that a lot of automotive locksmiths do not have the tools required to code keys. So, you'll require a professional to program your key or use an online key programmer. It's also important to inform them what type of key (chip smart, intelligent remote, or “push-to-start”) as well as the year your car was, and the VIN in the event that you can.