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How to Replace a Lexus Key Fob That Won't Turn On Or Work Correctly It can be very frustrating when your key fob doesn't function or will not turn on. There are a few simple steps you can follow to fix the problem. First remove the emergency keys from the key fob. Use the flat edge of a metal key to press on the cover and twist it open. Keyless Entry System The keyless entry system is a huge option for anyone who owns a car. You can lock your car before you touch the handle or walk out of the door for passengers. Some even turn on the lights as you approach or open the trunk, in case you've filled it with groceries, or activate 10 other electronic accessories depending on the proximity of your vehicle. The key fob sends a radio-frequency signal to the receiver in the car. The receiver will then send back an appropriate response code to the vehicle. The signal is valid only when the key fob is in a certain distance, typically 50 feet or less. Some of these systems work in a single-way mode this means that the key fob is able to lock or unlock the vehicle, but not start the engine. It is recommended that you have your keyless entry system professionally installed regardless of the model. A reliable locksmith in the automotive sector can assure that the connection is complete and secure, even if that requires stripping a tiny portion of each wire. The manual will explain the wires you should use. Another benefit of keyless remote access is that it can also lock your doors automatically when you walk away from the vehicle. This is a great feature for those who forget and often leave their car unlocked all day. Transponder Keys Transponder keys (or transponder chips) are a key feature of modern automobiles. They are embedded in the head of a key or fob and contain a unique number that's linked to your car's immobilizer system. The antenna ring on the top of the ignition sends an alert to the transponder chip once the key is inserted and turned ON. The chip sends a code-matching response to the antenna ring. Transponder chips deter theft, because the key has to be inserted correctly and with the right code to turn your car on. These keys are also harder to duplicate, making it less likely that someone will steal your vehicle. A reputable locksmith can create transponder key copies that can be programmed to match your vehicle at only a fraction of the price that you spend at a car dealer. They can also help you determine what kind of key you own and how to program it to your car. They might be able to offer you a replacement key to replace your stolen or lost transponder. They may also be able to help you reprogramme the chip if it is not working. Duplicate Keys A majority of people have lost their keys at some time in their lives whether it was car keys or their house keys. It can be very frustrating to be locked out of your home or vehicle. It is essential to have duplicate keys on hand to avoid this issue. The duplicate keys will help you unlock your lock in the event that you ever find yourself stuck. The majority of duplicate keys have the “do duplicate” message that is stamped or engraved on them. This is a way to let people that it's not legal to duplicate the key unless the owner of it. Keys like this are typically used to lock padlocks, deadbolts and other door locks. They also provide an excellent method of keeping the 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. However, this isn't true. The engraved message on the keys is a warning and does not have any legal weight. However, it could hinder some people from attempting to duplicate their keys. Some chain hardware stores refuse to cut these keys, but a locksmith can easily duplicate the keys. In fact, they could be cut on a lookalike blank to ensure that the duplicate is accurate. Battery Replacement If your Lexus key fob isn't working, it will probably have to be programmed to work with the immobilizer system of your vehicle. It is necessary to contact an expert locksmith or go to your dealer to modify the ECU. lexus key replacement will usually charge more than the dealership, but you'll avoid the headache of towing your vehicle. Apart from the ECU your battery may require replacement too. You'll be required to replace the previous battery with a new one that matches 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 the wrong battery, it could cause serious damage to your engine and other components. Examine the warranty prior purchase a new battery to determine if the price is covered. You'll also want to consider whether you require an assurance in case the battery fails within its warranty time. In addition, you should be aware that automotive locksmiths usually don't have the necessary tools to program keys, so you'll have to either have a dealer or online key programmer visit and program the key for you. It's also essential to inform them of the kind of key you had (chip or intelligent fob remote “push to start”) as well as the year of your car, and the VIN number if it is possible.