In a departure from previous years when the Seville basically mirrored the refinements found on the Eldorado, for 1998, the prestige-luxury sedan was exclusively redesigned as well as being positioned as Cadillac’s leading-edge “global market” product.
To back up this world-product positioning, the 1998 Seville was introduced at both the Frankfurt (Germany) and Tokyo auto shows in the fall of 1997.
Both the Seville Luxury Sedan (SLS) and Seville Touring Sedan (STS) again comprised the lineup.
The SLS was again powered by the 275-horsepower version of the Northstar 4.6-liter V-8 while the STS used the more powerful 300-horse Northstar version.
Both engines again were paired with the 4T80-E electronically controlled four-speed automatic transmission with viscous converter clutch.
Additionally, the STS was programmed for performance shifting via sensors in the vehicle, including the lateral acceleration sensor from StabiliTrak which was standard equipment on 1998 Sevilles.
These sensors evaluated the driver’s intentions and programmed the transmission to respond like a manual gearbox during enthusiastic driving.
The Seville was computer-designed to meet all world standards for front, side and rear impact, as well as those for roof crush resistance and offset crashes
A one-piece floor panel extended from the front of the dash to the rear of the trunk, minimizing joints and seams
The interior body side rings were stamped from a single laser-welded blank, saving weight and improving build quality
A pair of hydroformed tubes swept up from the base of the windshield into the roof and back down to the rear wheel wells.
These tubes helped form a safety cage around the passenger compartment, while improving torsional and beaming stiffness of the body structure.
Compared to the previous year’s sedan, the 1998 Seville’s overall length decreased from 204.1 inches to 201 inches while its wheelbase increased from 111 inches to 112.2 inches.
Track was also increased from 60.9 inches front and rear to 62.7 inches and 62.3 inches. respectively.
This wider stance contributed to Seville’s 120.4 cubic feet of interior space.
Up front Seville featured projection-beam headlamps that included a rectangular high beam.
Parking lights had an optical surface in the middle to focus light in the proper location.
The previously used bumper guards were deleted and the vertical height of the grille was decreased, making it appear wider
The SLS sedan’s grille was bright-finished in silver with a chrome edging and contained an integral full color wreath-and-crest emblem.
The STS sedan’s grille was body color with an argent monochrome integral wreath-and-crest emblem.
Foglamps were positioned in the lower grille on the STS while the SLS used extended horizontal bars to cover that area
The Seville’s hood featured a power-dome to enhance the image of the Northstar V-8.
A high decklid was retained at the rear, which improved both aerodynamics and trunk space.
A subtle rocker panel deflector ahead of the rear wheels added functional character as well as eliminating aero drag.
Seville SLS 1998
The Seville’s coefficient of drag was 0.31.
The wheels on the SLS had a larger, more aggressive look while those on the STS featured a more open, spoke design to reveal large-capacity brakes.
Seville featured Bosch 5.0 four-channel anti-lock braking and all-speed traction control as standard fare.
Seville also featured a smart’ electrical system based on 16 electronic control modules linked together into a network capable of transferring data at 10,400 bytes per second.
Inside, the SLS featured printed leather inserts for seat and door trim while the STS continued to use fine-perforated leather trim panels for seats and doors.
Task-oriented lighting in the Seville reduced glare and maximized visibility.
Seville’s new instrumentation used a fluorescent light to provide high-definition illumination, The STS sedan’s steering wheel (optional on SLS) had a power tilt and telescope feature, The shifter moved through a new serpentine gate for positive selection of the desired gear.
The parking brake released automatically when the car was shifted from park.
To reduce interior noise, the Seville used 5mm-thick door glass and doors sealed with triple rubber seals.
New standard equipment on the Seville included Magnasteer ill speed-sensitive power rack-and-pinion steering and Pass-Key III theft deterrent system.
The OnStar in-vehicle communications system was optional equipment on both the SLS and STS.
Also, a high-performance Bose 4.0 425-watt eight-speaker stereo system (including RDS and weather band) was standard on the STS and optional on the SLS.
Additionally, the STS was the first car to offer adaptive seating technology as optional equipment.
Adaptive seating, via a network of 10 air cells located in the front bucket seats.
Automatically recognized occupant position and adjusted the seats support to custom-fit every individual.