If you are referring to the factory security system, using the key to unlock the doors should disarm the system. If you have an aftermarket system installed, the disarm procedure will depend on the brand and model. The typical procedure is to enter the vehicle, turn the ignition key to the run position and activate the valet switch. The valet switch can be a button or a toggle type switch that is usually accessible from the driver's seat. Most system require that the valet switch be activated within a predetermined amount of time after the ignition has been turned on.
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