In June 1977 the Gemini received its first, light, facelift. The bigger 1817 cc G180 series engine became available, fitted with rectangular headlights rather than the round units used on the 1600. This model offered 110 PS (81 kW), although this output dropped to 105 PS (77 kW) if an automatic transmission was fitted.[2] In November of the same year the 1600 was updated, now with square headlights and an engine with the I·CAS oxidation catalyst ("Isuzu Clean Air System") which could manage the 1978 emissions standards.

In October 1977, the Florian underwent an extensive facelift. The interior and dash was all new, and at the front were double rectangular headlights. The car was now known as the Florian SII (for "Series II"), but none of this could hide the outdated profile of Isuzu's large sedan. The bumpers were also bigger (and heavier), and there were new, blocky taillights at the rear. The Van also underwent the same facelift, although its delicate, high-mounted taillights still remained unchanged. The facelift also marked the introduction of a diesel-engined model (appearing in November), which provided a useful boost to the Florian's sales. The Florian II also received improved equipment, including a variable ratio steering gear and heating ducts in the rear seat.

In November 1977, Isuzu decided to afford the 117 Coupé a facelift, which resulted in replacing the previous front fascia with four round headlights with more modern one with rectangular lights (keeping their number at four). In an effort to further decrease manufacturing costs, plastic moldings were used in the interior.