Transponder Keys: What to Do When Problems Arise
Remote keyless systems have been available in the United States since 1982. From then until now, dead transponder batteries have officially been an issue. Today, they are used to not only to unlock doors, but to locate the vehicle and ignite the engine. So when the battery dies on the portable transponder device, there are three or more problems to deal with.
Unless the transponder in question has a battery life indicator, the only way to find out is noticing the tell-tale signs of charge depletion. Owners may notice that it takes increasingly more attempts pressing the button to activate the receiver. Although the activation light on the transponder lights up, there is not an immediate answer from the remote keyless system in the car. The range of signal transmission will gradually shorten into nothing as the battery gives less and less output, making it steadily more difficult to find the vehicle in a parking lot.
What is a transponder?
For those unfamiliar with the concept, transponder is a blended word. It comes from mixing ‘responder’ together with ‘transmitter’. They communicate with the radio signal receivers in the vehicle by emitting electro-magnetic waves at the frequency of about one hundred and twenty five kilo Hertz. Manufacturers use this form of transmission because it can pass through physical objects such as other cars in a parking lot. The waves sent out are encoded by programmers to give a unique message that unlocks the car. This is the same process that opens an email account with a password.
Newer versions of remote keyless entry systems can do much more than open doors. They can activate alarm systems, adjust modular inboard devices like air conditioning and turn on lights. The next generation of these devices take the form of applications on smartphones. This method however, relies on satellite based internet networks and can be interrupted by atmospheric conditions or network technical problems. The electromagnetic emitting transponder devices do not suffer from these problems and will probably continue to be found on the market. High end versions include the infrared transponders found in some Mercedes Benz models.