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for security reasons this is difficult to reset usually the car and remotes need to be set up again. it happens when the car loses power so if the car is stolen or imobilised the car forgets the key codes. take the car to a dealer or Machanic shop. prove to them it is your car and they will set the remotes back up for you.
most aftermarket alarms have a valet button and in the case of lost or broken key fob the button can be held or pressed when the ignition is turned on the turn alarm off. if it is a factory installed system usually opening driver door with the key will disarm it
for a start,the transponder KEY, HAS to be coded into the car to start it.the remote is a seperate item but works in conjunction with the key.buying a seperate system is a waste of money,as it CANNOT be used in conjunction with the fitted system.buy a remote and get it coded with the spare(s) into the car, by a dealer that can do the job.the alarm works this way....the remote has TWO codes one fixed the other rolling,every time you operate it the rolling code changes(stops others from "learning")the fixed code allows the key to be recognised when put into the ignition and start the car(if the remote battery goes flat you can still start the car with the key but the alarm may sound if the doors have been locked by the remote).without the remote/key the car is effectively dead.stops theives from stealing your car cos they need to replace the whole ingnition system to get it going.
somehow the car when on valet mode, go to a alarm shop , they should be able to re arm your car without to much damage to your pocket, or read your cars manual, it might inform you on how to fix the problem.
Look under the driver side seat for a small black box. This is the control for the remote/alarm system. Check to see that it is not wet. Open it up & inspect the circuit board. Are any of the circuits corroded/greenish powder on them? If so, you need to replace this box. Quite a common failure. But, there IS hope. You CAN start the car without the aid of the remote since you lost it. Put the key in the ignition, and, if the lights start flashing, CYCLE the key on-off 5 times. This action will defeat the alarm, and the car will start. This is provided in case the battery in the remote goes dead on you.