Carried over with only modest trim changes, Sevilles got a retuned suspension to improve their ride, plus new body mounts.

• Nameplates moved from the upper right of the grille to the upper left, and that grille had a tighter pattern than before.
• The grille's pattern of vertical crosshatch slots was repeated in twin insets in the front bumper.
• Standard engine remained the 350 cu. in. (5.7-liter) V-8 with electronic fuel injection, now rated 170 horsepower.
• The diesel version introduced at mid-year was offered again.
• Sevilles destined for California received the three-way catalytic converter with closed-loop electronic controls, previously used only on other GM models.
• Bodies could have 14 standard colors, with seven Firemist colors available.
• Interiors came with new solid and striped Dante and Roma knit fabrics in six colors, or 11 shades of Sierra Grain leather.
• Either the Tuxedo Grain padded vinyl roof (in 17 colors, including metallics) or a plain metal top were offered at the same price.
• Options included the new digital trip computer and signal-seeking radios.
• Cadillac's catalog claimed that Seville had been chosen "one of the ten most beautifully designed production cars of the last 50 years."
• The special edition Elegante came in two-tone Slate Firemist and Sable Black, with accent striping and full-length side moldings with etched black grooving, plus a painted metal roof.
• Elegante was identified by a Cadillac wreath and crest as well as script nameplate.
• Standard were chrome-plated wire wheels with long-laced spokes.
• Seating areas and door panels had perforated leather inserts with suede-like vinyl trim, with leather-trimmed steering wheel.
• The Dual Comfort 40/40 seats had storage pockets and an integral fold-down center armrest.
• New for 1979 was plush fur-like Tangier carpeting.
• Elegante's price tag was $2735.