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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.
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 ...
Depending on the system, the vehicle is automatically unlocked when a button or sensor on the door handle or trunk release is pressed. Vehicles with a smart-key system have a mechanical backup, usually in the form of a spare key blade supplied with the vehicle. Some manufacturers hide the backup lock behind a cover for styling.
All models now featured Ford's proprietary door-mounted keypad entry system marketed as Securicode, and an automatic dimming high-beam module. This worked via a sensor located adjacent to the rear-view mirror, and sensitivity could be adjusted by a dial located on the dashboard.
A keypad is a block or pad of buttons set with an arrangement of digits, symbols, or alphabetical letters. Pads mostly containing numbers and used with computers are numeric keypads . Keypads are found on devices which require mainly numeric input such as calculators , television remotes , push-button telephones , vending machines , ATMs ...
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The model line marked the debut of Ford's proprietary door-mounted keypad system, marketed as its Keyless Entry System, a 5-button door-mounted keypad allowing access to the vehicle (through the entry of a 5-digit code). In different forms, the system remains a feature on Ford and Lincoln vehicles today (2025), marketed now as Securicode.
Front cornering lamps distinguish LS models. From 1992 onward, the Grand Marquis was produced solely as a four-door sedan, as the Colony Park station wagon was discontinued. Ford's proprietary door-mounted keypad system, marketed as Securicode, became optional on lower-trim models and standard on upper-trim packages.