was marketed to younger buyers in need of a larger car than a Ford Taurus/Mercury Sable. As such, the opera lamps and padded vinyl top were discontinued (the latter becoming a dealer-installed option), and the imitation wire wheel covers were replaced by aluminum alloy wheels. Revisions to the suspension and steering were made to improve both ride and handling. To improve stopping, four-wheel disc brakes replaced the rear drum brakes, with optional ABS; traction control was available as an option. As with the 1988-1991 models, the Grand Marquis was available in base-trim GS and deluxe-trim LS models. LS models are distinguished by front cornering lamps. From 1992 onward, the Grand Marquis was produced solely as a four-door sedan, as the Colony Park station wagon was discontinued. Ford's Keyless Entry System became optional on lower-trim packages, and standard on upper trim packages. Year-to-year changes 1992: Second-generation Grand Marquis introduced at the North American International Auto Show on January 11, 1991 after the November 28, 1990 unveiling. It launched on March 21, 1991 as an early 1992 model. All models come with driver's-side airbag standard with an optional passenger-side airbag. Partway through the model year, the AOD transmission was replaced by the AOD-E, which brought with it a different bellhousing pattern. 1993: Dual airbags become standard equipment on all models. Radios are redesigned with a new control layout. 1994: Increased side door impact protection. A/C refrigerant changed from R-12 to R-134a. 1995: Mid-cycle redesign. Exterior trim features increased use of body-color trim and less chrome. On the front, a larger, rounder grille is better integrated to the body, while all lights on the front are changed to clear lenses. The license plate is now centered in between the taillamps. On the trunk lid, the Mercury and Grand Marquis lettering is italicized and reduced in size. Inside, much of the interior receives an update, with new seats, door panels, and the entire dashboard is redesigned with attention paid to ergonomics. Switching locations with the climate controls, a Double-DIN radio featured large buttons and knobs; on models without automatic climate controls, rotary knobs replaced sliding controls. The power seat controls, if specified, were now located on the door panels along with enlarged buttons for the power windows and door locks. The outdated horizontal speedometer was replaced by the instrument cluster used in the Crown Victoria (adding a voltmeter and oil-pressure gauge); a digital instrument