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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.
Ford's proprietary door-mounted keypad system, marketed as its Securicode, unlocked the vehicle through a 5-digit combination (factory-programmed or owner-programmed). Mounted above the driver's door handle, the keypad allowed the driver to lock all four doors; after entering the code, the driver could unlock the doors or release the trunk lid.
The keypad also allows a user to walk away from a running vehicle, e.g., to warm up the vehicle in cold weather, returning to unlock the vehicle by the keypad. Ford introduced its proprietary keypad system with physical buttons for model year 1980 — on the Ford Thunderbird, Mercury Cougar, Lincoln Continental Mark VI, and Lincoln Town Car ...
Remote controls send a digital code word to the receiver. If the receiver determines the codeword is acceptable, then the receiver will actuate the relay, unlock the door, or open the barrier. Simple remote control systems use a fixed code word; the code word that opens the gate today will also open the gate tomorrow.
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Over the standard GS, the GS Convenience added all-speed traction control, power-adjustable pedals, rear reading lamps, body-side paint stripes, and Ford's proprietary door-mounted keypad system, marketed as Securicode. Additionally, several free-standing options were available on the GS Convenience: leather seating, a full-size spare tire ...
A Nissan Fuga intelligent key. A smart key is a vehicular passive entry system developed by Siemens in 1995 and introduced by Mercedes-Benz under the name "Keyless-Go" in 1998 on the W220 S-Class, [1] after the design patent was filed by Daimler-Benz on May 17, 1997.
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.