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Pressing a button on the key unlocks all of the car doors. Another button locks the car. In 1980, Ford Motor Company introduced an external keypad-type keyless entry system, wherein the driver entered a numeric combination —either pre-programmed at the factory or one programmed by the owner— to unlock the car without the key.
A modern motor vehicle contains a number of ECUs (electronic control units), and the door control unit (DCU) is one of the minor ones. The door control unit is responsible for controlling and monitoring various electronic accessories in a vehicle's door. Since most of the vehicles have more than one door, DCUs may be present in each door ...
One short beep signifies that the car is locked and alarm is set. The functions of a remote keyless entry system are contained on a key fob or built into the ignition key handle itself. Buttons are dedicated to locking or unlocking the doors and opening the trunk or tailgate.
Smart Crossblade – minimal "sword-like" door; Suzuki CV1 – one single door in the car's fiberglass body; Tata Magic Iris – All three doors are conventional doors, 2 doors on the passenger's side and 1 door on the driver's side. TVR Tuscan Speed Six – Conventional front doors, but door handles are in button form under the side mirrors.
It is often tempting to press the door-close button in an elevator, but that effort will likely not make the doors move any faster. This is because, as the New York Times reports, these buttons ...
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Some vehicles will arm when the power door lock switch is pressed with the driver's door open, and the door is subsequently closed. Some vehicles will disarm if the ignition is turned on; often when the vehicle is equipped with a key-based immobilizer and an alarm, the combination of the valid key code and the ignition disarms the system.
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